feat: AI Visibility — Brand Lookup and Prompt Explorer (#128)

package.json

@@ -28,6 +28,7 @@
     "test:watch": "vitest",
     "test:ci": "vitest run --reporter=dot",
     "billing:backlinks": "tsx scripts/backlinks-cost-profile.ts",
+    "billing:brand-lookup": "tsx scripts/brand-lookup-cost-profile.ts",
     "seed:rank-tracking": "tsx scripts/seed-rank-tracking.ts",
     "ci:check": "prettier --check . && knip && tsc --noEmit && oxlint . --type-aware"
   },
@@ -71,7 +72,9 @@
     "posthog-node": "^5.28.5",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
+    "react-markdown": "^10.1.0",
     "recharts": "^3.7.0",
+    "remark-gfm": "^4.0.1",
     "remeda": "^2.33.6",
     "robots-parser": "^3.0.1",
     "sonner": "^2.0.7",

scripts/brand-lookup-cost-profile.ts

@@ -0,0 +1,191 @@
+import process from "node:process";
+import {
+  buildLlmTarget,
+  CHATGPT_LANGUAGE_CODE,
+  CHATGPT_LOCATION_CODE,
+  fetchLlmAggregatedMetricsRaw,
+  fetchLlmMentionsSearchRaw,
+  fetchLlmTopPagesRaw,
+  type LlmPlatform,
+} from "@/server/lib/dataforseoLlm";
+import { applyBillingMarkupUsd } from "@/shared/billing";
+import { loadLocalEnv, parseArgs } from "./cli-utils";
+
+loadLocalEnv();
+
+const args = parseArgs(process.argv.slice(2));
+
+await main();
+
+/**
+ * Confirm what a single Brand Lookup actually costs against DataForSEO.
+ * Mirrors `backlinks-cost-profile.ts` but reports per-call USD cost so we can
+ * verify the on-screen "Est. $X" against reality.
+ */
+async function main() {
+  if (process.env.CI === "true" && args.allowCi !== "true") {
+    printUsageAndExit(
+      "Refusing to run live billing checks in CI without --allowCi=true.",
+    );
+  }
+
+  if (args.confirmLive !== "true") {
+    printUsageAndExit(
+      "This command makes live, billable DataForSEO requests. Re-run with --confirmLive=true.",
+    );
+  }
+
+  if (!process.env.DATAFORSEO_API_KEY) {
+    printUsageAndExit("Missing DATAFORSEO_API_KEY.");
+  }
+
+  const target = args.target;
+  if (!target) {
+    printUsageAndExit("Missing --target.");
+  }
+
+  const targetType = parseTargetType(args.targetType);
+  const userLocationCode = parsePositiveInteger(args.locationCode, 2840);
+  const userLanguageCode = args.languageCode ?? "en";
+  const repeat = parsePositiveInteger(args.repeat, 1);
+
+  const llmTarget = buildLlmTarget({ type: targetType, value: target });
+  const platforms: LlmPlatform[] = ["chat_gpt", "google"];
+
+  const allRuns: RunSummary[] = [];
+
+  for (let runIndex = 0; runIndex < repeat; runIndex += 1) {
+    const calls: CallRecord[] = [];
+
+    for (const platform of platforms) {
+      // ChatGPT data is only indexed for US/en, mirroring the production
+      // brandLookup service.
+      const locationCode =
+        platform === "chat_gpt" ? CHATGPT_LOCATION_CODE : userLocationCode;
+      const languageCode =
+        platform === "chat_gpt" ? CHATGPT_LANGUAGE_CODE : userLanguageCode;
+
+      const aggregated = await fetchLlmAggregatedMetricsRaw({
+        target: llmTarget,
+        platform,
+        locationCode,
+        languageCode,
+        internalListLimit: 20,
+      });
+      calls.push(toRecord(platform, "aggregated_metrics", aggregated.billing));
+
+      const topPages = await fetchLlmTopPagesRaw({
+        target: llmTarget,
+        platform,
+        locationCode,
+        languageCode,
+        itemsListLimit: 10,
+      });
+      calls.push(toRecord(platform, "top_pages", topPages.billing));
+
+      const mentions = await fetchLlmMentionsSearchRaw({
+        target: llmTarget,
+        platform,
+        locationCode,
+        languageCode,
+        limit: 25,
+      });
+      calls.push(toRecord(platform, "mentions_search", mentions.billing));
+    }
+
+    const totalRawUsd = sum(calls.map((c) => c.rawUsd));
+    allRuns.push({
+      run: runIndex + 1,
+      calls,
+      totalRawUsd: round(totalRawUsd),
+      totalBilledUsd: applyBillingMarkupUsd(totalRawUsd),
+    });
+  }
+
+  const aggregateRawUsd = sum(allRuns.map((r) => r.totalRawUsd));
+  const aggregateBilledUsd = applyBillingMarkupUsd(aggregateRawUsd);
+
+  console.log(
+    JSON.stringify(
+      {
+        input: {
+          target,
+          targetType,
+          userLocationCode,
+          userLanguageCode,
+          repeat,
+        },
+        runs: allRuns,
+        aggregate: {
+          totalRawUsd: round(aggregateRawUsd),
+          totalBilledUsd: aggregateBilledUsd,
+          avgRawPerLookupUsd: round(aggregateRawUsd / allRuns.length),
+          avgBilledPerLookupUsd: round(aggregateBilledUsd / allRuns.length),
+        },
+      },
+      null,
+      2,
+    ),
+  );
+}
+
+type CallRecord = {
+  platform: LlmPlatform;
+  endpoint: string;
+  path: string;
+  resultCount: number | null;
+  rawUsd: number;
+  billedUsd: number;
+};
+
+type RunSummary = {
+  run: number;
+  calls: CallRecord[];
+  totalRawUsd: number;
+  totalBilledUsd: number;
+};
+
+function toRecord(
+  platform: LlmPlatform,
+  endpoint: string,
+  billing: { costUsd: number; path: string[]; resultCount: number | null },
+): CallRecord {
+  return {
+    platform,
+    endpoint,
+    path: billing.path.join("/"),
+    resultCount: billing.resultCount,
+    rawUsd: round(billing.costUsd),
+    billedUsd: applyBillingMarkupUsd(billing.costUsd),
+  };
+}
+
+function parseTargetType(value: string | undefined): "domain" | "keyword" {
+  if (!value || value === "domain") return "domain";
+  if (value === "keyword") return "keyword";
+  printUsageAndExit(
+    `Invalid --targetType: ${value}. Expected domain or keyword.`,
+  );
+}
+
+function parsePositiveInteger(value: string | undefined, fallback: number) {
+  if (!value) return fallback;
+  const parsed = Number.parseInt(value, 10);
+  return Number.isFinite(parsed) && parsed > 0 ? parsed : fallback;
+}
+
+function sum(values: number[]): number {
+  return values.reduce((total, value) => total + value, 0);
+}
+
+function round(value: number): number {
+  return Math.round(value * 1_000_000) / 1_000_000;
+}
+
+function printUsageAndExit(message: string): never {
+  console.error(message);
+  console.error(
+    "Usage: pnpm billing:brand-lookup --target=example.com --confirmLive=true [--targetType=domain|keyword] [--locationCode=2840] [--languageCode=en] [--repeat=1] [--allowCi=true]",
+  );
+  process.exit(1);
+}

src/client/components/table/SortableHeader.tsx

@@ -0,0 +1,43 @@
+import { ArrowDown, ArrowUp } from "lucide-react";
+import { HeaderHelpLabel } from "@/client/features/keywords/components";
+
+type SortableColumn = {
+  getIsSorted: () => false | "asc" | "desc";
+  getToggleSortingHandler: () => ((event: unknown) => void) | undefined;
+};
+
+export function SortableHeader({
+  column,
+  label,
+  helpText,
+  align,
+}: {
+  column: SortableColumn;
+  label: string;
+  helpText?: string;
+  align?: "left" | "right";
+}) {
+  const sorted = column.getIsSorted();
+  const content = (
+    <button
+      type="button"
+      className="inline-flex items-center gap-1 font-medium transition-colors hover:text-base-content"
+      onClick={column.getToggleSortingHandler()}
+      aria-label={`Sort by ${label}`}
+      aria-pressed={!!sorted}
+    >
+      {helpText ? <HeaderHelpLabel label={label} helpText={helpText} /> : label}
+      {sorted === "asc" ? (
+        <ArrowUp className="size-3 shrink-0" />
+      ) : sorted === "desc" ? (
+        <ArrowDown className="size-3 shrink-0" />
+      ) : null}
+    </button>
+  );
+
+  if (align === "right") {
+    return <span className="flex w-full justify-end">{content}</span>;
+  }
+
+  return content;
+}

src/client/components/table/nullSafeSort.ts

@@ -0,0 +1,76 @@
+import type { Row } from "@tanstack/react-table";
+
+/**
+ * Null/undefined-aware sorting functions that keep blank rows at the bottom
+ * regardless of direction. TanStack's built-in `sortUndefined: "last"` gets
+ * inverted by the desc sign flip — these helpers read the column's sort
+ * direction from the cell context and return a value that survives the flip.
+ */
+
+export function isDescending<TData>(
+  row: Row<TData>,
+  columnId: string,
+): boolean {
+  const cell = row.getAllCells().find((c) => c.column.id === columnId);
+  return cell?.column.getIsSorted() === "desc";
+}
+
+/**
+ * Compare two nullable numeric values with nulls always at the bottom,
+ * regardless of the column's current sort direction. Use this directly for
+ * tiebreakers or when the value isn't the column's accessor.
+ */
+export function compareNumericNullsLast(
+  a: number | null | undefined,
+  b: number | null | undefined,
+  descending: boolean,
+): number {
+  if (a == null && b == null) return 0;
+  if (a == null || b == null) {
+    const sign = descending ? -1 : 1;
+    return (a == null ? 1 : -1) * sign;
+  }
+  return a - b;
+}
+
+export function numericNullsLast<TData>(
+  rowA: Row<TData>,
+  rowB: Row<TData>,
+  columnId: string,
+): number {
+  return compareNumericNullsLast(
+    rowA.getValue<number | null | undefined>(columnId),
+    rowB.getValue<number | null | undefined>(columnId),
+    isDescending(rowA, columnId),
+  );
+}
+
+export function stringNullsLast<TData>(
+  rowA: Row<TData>,
+  rowB: Row<TData>,
+  columnId: string,
+): number {
+  const a = rowA.getValue<string | null | undefined>(columnId);
+  const b = rowB.getValue<string | null | undefined>(columnId);
+  if (!a && !b) return 0;
+  if (!a || !b) {
+    const sign = isDescending(rowA, columnId) ? -1 : 1;
+    return (!a ? 1 : -1) * sign;
+  }
+  return a.toLowerCase().localeCompare(b.toLowerCase());
+}
+
+export function dateNullsLast<TData>(
+  rowA: Row<TData>,
+  rowB: Row<TData>,
+  columnId: string,
+): number {
+  const a = rowA.getValue<string | null | undefined>(columnId);
+  const b = rowB.getValue<string | null | undefined>(columnId);
+  if (!a && !b) return 0;
+  if (!a || !b) {
+    const sign = isDescending(rowA, columnId) ? -1 : 1;
+    return (!a ? 1 : -1) * sign;
+  }
+  return Date.parse(a) - Date.parse(b);
+}

src/client/features/ai-search/BrandLookupPage.tsx

@@ -0,0 +1,210 @@
+import { useEffect, useState, type FormEvent } from "react";
+import { useQuery } from "@tanstack/react-query";
+import { AutumnProvider, useCustomer } from "autumn-js/react";
+import {
+  AlertCircle,
+  ArrowLeft,
+  BarChart3,
+  Quote,
+  TrendingUp,
+} from "lucide-react";
+import { lookupBrand } from "@/serverFunctions/ai-search";
+import { useSession } from "@/lib/auth-client";
+import { getCustomerPlanStatus } from "@/client/features/billing/plan-detection";
+import { getStandardErrorMessage } from "@/client/lib/error-messages";
+import { BrandLookupResults } from "@/client/features/ai-search/components/BrandLookupResults";
+import { BrandLookupSearchCard } from "@/client/features/ai-search/components/BrandLookupSearchCard";
+import { BrandLookupHistorySection } from "@/client/features/ai-search/components/BrandLookupHistorySection";
+import { AiSearchLoadingState } from "@/client/features/ai-search/components/AiSearchLoadingState";
+import { AiSearchPaidPlanGate } from "@/client/features/ai-search/components/AiSearchPaidPlanGate";
+import { useBrandLookupSearchHistory } from "@/client/hooks/useBrandLookupSearchHistory";
+import { BRAND_LOOKUP_MAX_INPUT_LENGTH } from "@/types/schemas/ai-search";
+
+type Props = {
+  projectId: string;
+  initialQuery: string;
+  onQueryChange: (next: string) => void;
+};
+
+const BRAND_LOOKUP_BULLETS = [
+  {
+    icon: TrendingUp,
+    title: "Track AI visibility",
+    body: "Count how often ChatGPT and Google AI Overview cite your brand, and watch the trend month over month.",
+  },
+  {
+    icon: Quote,
+    title: "See the prompts",
+    body: "View the actual user questions where LLMs reference your domain — the real demand driving AI traffic.",
+  },
+  {
+    icon: BarChart3,
+    title: "Map the competition",
+    body: "Spot the pages LLMs cite alongside you so you know who's competing for attention in AI answers.",
+  },
+];
+
+export function BrandLookupPage(props: Props) {
+  return (
+    <AutumnProvider>
+      <BrandLookupPageInner {...props} />
+    </AutumnProvider>
+  );
+}
+
+function BrandLookupPageInner({
+  projectId,
+  initialQuery,
+  onQueryChange,
+}: Props) {
+  const [query, setQuery] = useState(initialQuery);
+  const [validationError, setValidationError] = useState<string | null>(null);
+
+  const { data: session } = useSession();
+  const customerQuery = useCustomer({
+    queryOptions: { enabled: Boolean(session?.user?.id) },
+  });
+  const planKnown = customerQuery.isSuccess || customerQuery.isError;
+  const isFreePlan =
+    !!customerQuery.data &&
+    getCustomerPlanStatus(customerQuery.data) === "free";
+
+  const trimmedInitialQuery = initialQuery.trim();
+  const hasActiveQuery = trimmedInitialQuery.length > 0;
+
+  const lookupQuery = useQuery({
+    queryKey: ["brand-lookup", projectId, trimmedInitialQuery],
+    queryFn: () =>
+      lookupBrand({
+        data: {
+          projectId,
+          query: trimmedInitialQuery,
+          locationCode: 2840,
+          languageCode: "en",
+        },
+      }),
+    enabled: hasActiveQuery && !isFreePlan,
+    staleTime: 5 * 60 * 1000,
+    retry: false,
+  });
+
+  const {
+    history,
+    isLoaded: historyLoaded,
+    addSearch,
+    removeHistoryItem,
+  } = useBrandLookupSearchHistory(projectId);
+
+  useEffect(() => {
+    if (hasActiveQuery && lookupQuery.isSuccess) {
+      addSearch({ query: trimmedInitialQuery });
+    }
+  }, [hasActiveQuery, lookupQuery.isSuccess, trimmedInitialQuery, addSearch]);
+
+  const handleSubmit = (event: FormEvent) => {
+    event.preventDefault();
+    const trimmed = query.trim();
+    if (trimmed.length === 0) {
+      setValidationError("Enter a brand name or domain");
+      return;
+    }
+    if (trimmed.length > BRAND_LOOKUP_MAX_INPUT_LENGTH) {
+      setValidationError(
+        `Keep it under ${BRAND_LOOKUP_MAX_INPUT_LENGTH} characters`,
+      );
+      return;
+    }
+    setValidationError(null);
+    onQueryChange(trimmed);
+  };
+
+  const handleSelectHistoryItem = (item: { query: string }) => {
+    setQuery(item.query);
+    setValidationError(null);
+    onQueryChange(item.query);
+  };
+
+  const handleShowRecentSearches = () => {
+    setQuery("");
+    setValidationError(null);
+    onQueryChange("");
+  };
+
+  const isLoading = hasActiveQuery && lookupQuery.isPending;
+  const errorMessage =
+    hasActiveQuery && lookupQuery.isError
+      ? getStandardErrorMessage(lookupQuery.error)
+      : null;
+  const resultData = hasActiveQuery ? lookupQuery.data : undefined;
+
+  if (!planKnown) return null;
+
+  return (
+    <div className="px-4 py-4 pb-24 overflow-auto md:px-6 md:py-6 md:pb-8">
+      <div className="mx-auto max-w-7xl space-y-4">
+        <div>
+          <h1 className="text-2xl font-semibold">Brand Lookup</h1>
+          <p className="text-sm text-base-content/70">
+            See how AI search cites any brand name or domain.
+          </p>
+        </div>
+
+        {isFreePlan ? (
+          <AiSearchPaidPlanGate
+            feature="Brand Lookup"
+            description="See how ChatGPT and Google AI Overview cite any brand or domain — total mentions, the prompts driving them, and the pages cited alongside yours."
+            bullets={BRAND_LOOKUP_BULLETS}
+          />
+        ) : (
+          <>
+            <BrandLookupSearchCard
+              query={query}
+              onQueryChange={(next) => {
+                setQuery(next);
+                if (validationError) setValidationError(null);
+              }}
+              onSubmit={handleSubmit}
+              isLoading={isLoading}
+              validationError={validationError}
+            />
+
+            {errorMessage ? (
+              <div
+                role="alert"
+                className="flex items-start gap-2 rounded-lg border border-error/30 bg-error/10 p-3 text-sm text-error"
+              >
+                <AlertCircle className="mt-0.5 size-4 shrink-0" />
+                <span>{errorMessage}</span>
+              </div>
+            ) : null}
+
+            {isLoading ? (
+              <AiSearchLoadingState />
+            ) : resultData ? (
+              <>
+                <div>
+                  <button
+                    type="button"
+                    className="btn btn-ghost btn-sm gap-2 px-0 text-base-content/70 hover:bg-transparent"
+                    onClick={handleShowRecentSearches}
+                  >
+                    <ArrowLeft className="size-4" />
+                    Recent searches
+                  </button>
+                </div>
+                <BrandLookupResults result={resultData} />
+              </>
+            ) : !errorMessage ? (
+              <BrandLookupHistorySection
+                history={history}
+                historyLoaded={historyLoaded}
+                onRemoveHistoryItem={removeHistoryItem}
+                onSelectHistoryItem={handleSelectHistoryItem}
+              />
+            ) : null}
+          </>
+        )}
+      </div>
+    </div>
+  );
+}

src/client/features/ai-search/PromptExplorerPage.tsx

@@ -0,0 +1,256 @@
+import { useState, type FormEvent } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { AutumnProvider, useCustomer } from "autumn-js/react";
+import {
+  AlertCircle,
+  ArrowLeft,
+  Columns3,
+  SearchCheck,
+  Sparkles,
+} from "lucide-react";
+import { explorePrompt } from "@/serverFunctions/ai-search";
+import { useSession } from "@/lib/auth-client";
+import { getCustomerPlanStatus } from "@/client/features/billing/plan-detection";
+import { getStandardErrorMessage } from "@/client/lib/error-messages";
+import { PromptExplorerForm } from "@/client/features/ai-search/components/PromptExplorerForm";
+import { PromptExplorerResults } from "@/client/features/ai-search/components/PromptExplorerResults";
+import { PromptExplorerLoadingState } from "@/client/features/ai-search/components/PromptExplorerLoadingState";
+import { PromptExplorerHistorySection } from "@/client/features/ai-search/components/PromptExplorerHistorySection";
+import { AiSearchPaidPlanGate } from "@/client/features/ai-search/components/AiSearchPaidPlanGate";
+import {
+  usePromptExplorerSearchHistory,
+  type PromptExplorerSearchHistoryItem,
+} from "@/client/hooks/usePromptExplorerSearchHistory";
+import {
+  PROMPT_EXPLORER_MAX_PROMPT_LENGTH,
+  PROMPT_EXPLORER_MODELS,
+  type PromptExplorerModel,
+  type WebSearchCountryCode,
+} from "@/types/schemas/ai-search";
+
+type Props = {
+  projectId: string;
+};
+
+const PROMPT_EXPLORER_BULLETS = [
+  {
+    icon: Columns3,
+    title: "Four models side-by-side",
+    body: "Run one prompt across ChatGPT, Claude, Gemini, and Perplexity and compare answers in a single view.",
+  },
+  {
+    icon: SearchCheck,
+    title: "See what the models cite",
+    body: "Every answer lists the sources it drew from, so you can audit where each model gets its information.",
+  },
+  {
+    icon: Sparkles,
+    title: "Check brand mentions",
+    body: "Highlight a brand to instantly see whether it shows up in the answer text or the cited sources.",
+  },
+];
+
+type FormState = {
+  prompt: string;
+  highlightBrand: string;
+  models: PromptExplorerModel[];
+  webSearch: boolean;
+  webSearchCountryCode: WebSearchCountryCode;
+};
+
+const INITIAL_FORM_STATE: FormState = {
+  prompt: "",
+  highlightBrand: "",
+  models: [...PROMPT_EXPLORER_MODELS],
+  webSearch: true,
+  webSearchCountryCode: "US",
+};
+
+export function PromptExplorerPage(props: Props) {
+  return (
+    <AutumnProvider>
+      <PromptExplorerPageInner {...props} />
+    </AutumnProvider>
+  );
+}
+
+function PromptExplorerPageInner({ projectId }: Props) {
+  const [form, setForm] = useState<FormState>(INITIAL_FORM_STATE);
+  const [validationError, setValidationError] = useState<string | null>(null);
+
+  const { data: session } = useSession();
+  const customerQuery = useCustomer({
+    queryOptions: { enabled: Boolean(session?.user?.id) },
+  });
+  const planKnown = customerQuery.isSuccess || customerQuery.isError;
+  const isFreePlan =
+    !!customerQuery.data &&
+    getCustomerPlanStatus(customerQuery.data) === "free";
+
+  const {
+    history,
+    isLoaded: historyLoaded,
+    addSearch,
+    removeHistoryItem,
+  } = usePromptExplorerSearchHistory(projectId);
+
+  const exploreMutation = useMutation({
+    mutationFn: (input: FormState) =>
+      explorePrompt({
+        data: {
+          projectId,
+          prompt: input.prompt,
+          models: input.models,
+          highlightBrand:
+            input.highlightBrand.length > 0 ? input.highlightBrand : undefined,
+          webSearch: input.webSearch,
+          webSearchCountryCode: input.webSearchCountryCode,
+        },
+      }),
+  });
+
+  const runExplore = (values: FormState) => {
+    const normalized: FormState = {
+      ...values,
+      prompt: values.prompt.trim(),
+      highlightBrand: values.highlightBrand.trim(),
+    };
+    addSearch({
+      prompt: normalized.prompt,
+      highlightBrand: normalized.highlightBrand,
+      models: normalized.models,
+      webSearch: normalized.webSearch,
+      webSearchCountryCode: normalized.webSearchCountryCode,
+    });
+    exploreMutation.mutate(normalized);
+  };
+
+  const handleSubmit = (event: FormEvent) => {
+    event.preventDefault();
+    const trimmedPrompt = form.prompt.trim();
+    if (trimmedPrompt.length === 0) {
+      setValidationError("Enter a prompt");
+      return;
+    }
+    if (trimmedPrompt.length > PROMPT_EXPLORER_MAX_PROMPT_LENGTH) {
+      setValidationError(
+        `Keep prompts under ${PROMPT_EXPLORER_MAX_PROMPT_LENGTH} characters`,
+      );
+      return;
+    }
+    if (form.models.length === 0) {
+      setValidationError("Select at least one model");
+      return;
+    }
+    setValidationError(null);
+    runExplore(form);
+  };
+
+  const handleSelectHistoryItem = (item: PromptExplorerSearchHistoryItem) => {
+    const nextForm: FormState = {
+      prompt: item.prompt,
+      highlightBrand: item.highlightBrand,
+      models: item.models,
+      webSearch: item.webSearch,
+      webSearchCountryCode: item.webSearchCountryCode,
+    };
+    setForm(nextForm);
+    setValidationError(null);
+    runExplore(nextForm);
+  };
+
+  const handleShowRecentSearches = () => {
+    exploreMutation.reset();
+    setForm(INITIAL_FORM_STATE);
+    setValidationError(null);
+  };
+
+  const errorMessage = exploreMutation.isError
+    ? getStandardErrorMessage(exploreMutation.error)
+    : null;
+
+  const updateForm = <K extends keyof FormState>(
+    key: K,
+    value: FormState[K],
+  ) => {
+    setForm((prev) => ({ ...prev, [key]: value }));
+    if (validationError) setValidationError(null);
+  };
+
+  if (!planKnown) return null;
+
+  return (
+    <div className="px-4 py-4 pb-24 overflow-auto md:px-6 md:py-6 md:pb-8">
+      <div className="mx-auto max-w-7xl space-y-4">
+        <div>
+          <h1 className="text-2xl font-semibold">Prompt Explorer</h1>
+          <p className="text-sm text-base-content/70">
+            Ask any prompt across ChatGPT, Claude, Gemini, and Perplexity
+            side-by-side.
+          </p>
+        </div>
+
+        {isFreePlan ? (
+          <AiSearchPaidPlanGate
+            feature="Prompt Explorer"
+            description="Ask one prompt across ChatGPT, Claude, Gemini, and Perplexity at the same time and compare their answers — including which sources each model cites."
+            bullets={PROMPT_EXPLORER_BULLETS}
+          />
+        ) : (
+          <>
+            <PromptExplorerForm
+              form={form}
+              onPromptChange={(value) => updateForm("prompt", value)}
+              onHighlightBrandChange={(value) =>
+                updateForm("highlightBrand", value)
+              }
+              onModelsChange={(value) => updateForm("models", value)}
+              onWebSearchChange={(value) => updateForm("webSearch", value)}
+              onCountryChange={(value) =>
+                updateForm("webSearchCountryCode", value)
+              }
+              onSubmit={handleSubmit}
+              isLoading={exploreMutation.isPending}
+              validationError={validationError}
+            />
+
+            {errorMessage ? (
+              <div
+                role="alert"
+                className="flex items-start gap-2 rounded-lg border border-error/30 bg-error/10 p-3 text-sm text-error"
+              >
+                <AlertCircle className="mt-0.5 size-4 shrink-0" />
+                <span>{errorMessage}</span>
+              </div>
+            ) : null}
+
+            {exploreMutation.isPending ? (
+              <PromptExplorerLoadingState modelCount={form.models.length} />
+            ) : exploreMutation.data ? (
+              <>
+                <div>
+                  <button
+                    type="button"
+                    className="btn btn-ghost btn-sm gap-2 px-0 text-base-content/70 hover:bg-transparent"
+                    onClick={handleShowRecentSearches}
+                  >
+                    <ArrowLeft className="size-4" />
+                    Recent searches
+                  </button>
+                </div>
+                <PromptExplorerResults result={exploreMutation.data} />
+              </>
+            ) : !errorMessage ? (
+              <PromptExplorerHistorySection
+                history={history}
+                historyLoaded={historyLoaded}
+                onRemoveHistoryItem={removeHistoryItem}
+                onSelectHistoryItem={handleSelectHistoryItem}
+              />
+            ) : null}
+          </>
+        )}
+      </div>
+    </div>
+  );
+}

src/client/features/ai-search/brandLookupFilterTypes.ts

@@ -0,0 +1,33 @@
+export type CitationTab = "pages" | "queries";
+
+export type TopPagesFilterValues = {
+  include: string;
+  exclude: string;
+  platform: string;
+  minMentions: string;
+  maxMentions: string;
+};
+
+export type QueriesFilterValues = {
+  include: string;
+  exclude: string;
+  platform: string;
+  minVolume: string;
+  maxVolume: string;
+};
+
+export const EMPTY_TOP_PAGES_FILTERS: TopPagesFilterValues = {
+  include: "",
+  exclude: "",
+  platform: "",
+  minMentions: "",
+  maxMentions: "",
+};
+
+export const EMPTY_QUERIES_FILTERS: QueriesFilterValues = {
+  include: "",
+  exclude: "",
+  platform: "",
+  minVolume: "",
+  maxVolume: "",
+};

src/client/features/ai-search/brandLookupFiltering.ts

@@ -0,0 +1,93 @@
+import { parseTerms } from "@/client/features/keywords/utils";
+import type { BrandLookupResult } from "@/types/schemas/ai-search";
+import type {
+  QueriesFilterValues,
+  TopPagesFilterValues,
+} from "./brandLookupFilterTypes";
+
+function passesNumericFilter(
+  value: number | null | undefined,
+  min: string,
+  max: string,
+): boolean {
+  if (value == null) return true;
+  const minN = Number(min);
+  if (min && !Number.isNaN(minN) && value < minN) return false;
+  const maxN = Number(max);
+  if (max && !Number.isNaN(maxN) && value > maxN) return false;
+  return true;
+}
+
+function passesTextFilter(
+  haystack: string,
+  includeTerms: string[],
+  excludeTerms: string[],
+): boolean {
+  const lower = haystack.toLowerCase();
+  if (
+    includeTerms.length > 0 &&
+    !includeTerms.some((term) => lower.includes(term))
+  ) {
+    return false;
+  }
+  if (excludeTerms.some((term) => lower.includes(term))) {
+    return false;
+  }
+  return true;
+}
+
+export function filterTopPages(
+  rows: BrandLookupResult["topPages"],
+  filters: TopPagesFilterValues,
+): BrandLookupResult["topPages"] {
+  const includeTerms = parseTerms(filters.include);
+  const excludeTerms = parseTerms(filters.exclude);
+
+  return rows.filter((row) => {
+    const textFields = [row.url, row.domain]
+      .filter((v): v is string => Boolean(v))
+      .join(" ");
+
+    if (!passesTextFilter(textFields, includeTerms, excludeTerms)) return false;
+    if (filters.platform && row.platform !== filters.platform) return false;
+    if (
+      !passesNumericFilter(
+        row.mentions,
+        filters.minMentions,
+        filters.maxMentions,
+      )
+    ) {
+      return false;
+    }
+    return true;
+  });
+}
+
+export function filterQueries(
+  rows: BrandLookupResult["topQueries"],
+  filters: QueriesFilterValues,
+): BrandLookupResult["topQueries"] {
+  const includeTerms = parseTerms(filters.include);
+  const excludeTerms = parseTerms(filters.exclude);
+
+  return rows.filter((row) => {
+    const textFields = [row.question, ...row.brandsMentioned].join(" ");
+
+    if (!passesTextFilter(textFields, includeTerms, excludeTerms)) return false;
+    if (filters.platform && row.platform !== filters.platform) return false;
+    if (
+      !passesNumericFilter(
+        row.aiSearchVolume,
+        filters.minVolume,
+        filters.maxVolume,
+      )
+    ) {
+      return false;
+    }
+    return true;
+  });
+}
+
+export function countActiveFilters(values: Record<string, string>): number {
+  return Object.values(values).filter((v) => v.trim() !== "").length;
+}

src/client/features/ai-search/components/AiSearchLoadingState.tsx

@@ -0,0 +1,29 @@
+export function AiSearchLoadingState() {
+  return (
+    <div className="space-y-8" aria-busy>
+      <div className="grid grid-cols-1 gap-px overflow-hidden rounded-xl border border-base-300 bg-base-300 sm:grid-cols-3">
+        {Array.from({ length: 3 }).map((_, index) => (
+          <div key={index} className="space-y-2 bg-base-100 p-5">
+            <div className="skeleton h-3 w-24" />
+            <div className="skeleton h-8 w-32" />
+            <div className="skeleton h-3 w-40" />
+          </div>
+        ))}
+      </div>
+
+      <div className="space-y-3">
+        <div className="skeleton h-4 w-32" />
+        <div className="space-y-2 rounded-lg border border-base-300 p-4">
+          {Array.from({ length: 6 }).map((_, index) => (
+            <div key={index} className="grid grid-cols-6 gap-3">
+              <div className="skeleton col-span-3 h-4" />
+              <div className="skeleton h-4" />
+              <div className="skeleton h-4" />
+              <div className="skeleton h-4" />
+            </div>
+          ))}
+        </div>
+      </div>
+    </div>
+  );
+}

src/client/features/ai-search/components/AiSearchPaidPlanGate.tsx

@@ -0,0 +1,49 @@
+import { Link } from "@tanstack/react-router";
+import { Sparkles, type LucideIcon } from "lucide-react";
+import { SUBSCRIBE_ROUTE } from "@/shared/billing";
+
+type Props = {
+  feature: string;
+  description: string;
+  bullets: Array<{ icon: LucideIcon; title: string; body: string }>;
+};
+
+export function AiSearchPaidPlanGate({ feature, description, bullets }: Props) {
+  return (
+    <div className="mx-auto max-w-3xl overflow-hidden rounded-xl border border-base-300 bg-base-100 shadow-sm">
+      <div className="flex flex-col gap-5 px-6 py-6 sm:flex-row sm:items-start sm:justify-between">
+        <div className="max-w-xl space-y-2">
+          <span className="inline-flex items-center gap-1.5 rounded-full bg-primary/10 px-2.5 py-1 text-xs font-medium text-primary">
+            <Sparkles className="size-3.5" />
+            Paid plan
+          </span>
+          <h2 className="text-xl font-semibold tracking-tight">
+            Unlock {feature}
+          </h2>
+          <p className="text-sm text-base-content/70">{description}</p>
+        </div>
+        <Link
+          to={SUBSCRIBE_ROUTE}
+          search={{ upgrade: true }}
+          className="btn btn-primary shrink-0"
+        >
+          Upgrade
+        </Link>
+      </div>
+
+      <div className="grid grid-cols-1 gap-5 border-t border-base-300 px-6 py-6 sm:grid-cols-3">
+        {bullets.map(({ icon: Icon, title, body }) => (
+          <div key={title} className="space-y-2">
+            <div className="inline-flex size-9 items-center justify-center rounded-lg bg-primary/10 text-primary">
+              <Icon className="size-4" />
+            </div>
+            <h3 className="text-sm font-semibold">{title}</h3>
+            <p className="text-xs leading-relaxed text-base-content/65">
+              {body}
+            </p>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

src/client/features/ai-search/components/BrandLookupCitationTables.tsx

@@ -0,0 +1,210 @@
+import {
+  createColumnHelper,
+  flexRender,
+  type Table,
+} from "@tanstack/react-table";
+import { ExternalLink } from "lucide-react";
+import { SortableHeader } from "@/client/components/table/SortableHeader";
+import { numericNullsLast } from "@/client/components/table/nullSafeSort";
+import {
+  formatCount,
+  formatPlatformLabel,
+} from "@/client/features/ai-search/platformLabels";
+import { formatUrlForDisplay } from "@/client/features/ai-search/urlDisplay";
+import type { BrandLookupResult } from "@/types/schemas/ai-search";
+
+type TopPageRow = BrandLookupResult["topPages"][number];
+type TopQueryRow = BrandLookupResult["topQueries"][number];
+type PlatformKey = TopPageRow["platform"];
+
+const PLATFORM_BADGE_CLASS: Record<PlatformKey, string> = {
+  chat_gpt: "border-emerald-500/40 bg-emerald-500/10 text-emerald-500",
+  google: "border-sky-500/40 bg-sky-500/10 text-sky-500",
+};
+
+function PlatformBadge({ platform }: { platform: PlatformKey }) {
+  return (
+    <span className={`badge badge-sm border ${PLATFORM_BADGE_CLASS[platform]}`}>
+      {formatPlatformLabel(platform)}
+    </span>
+  );
+}
+
+const pagesHelper = createColumnHelper<TopPageRow>();
+const queriesHelper = createColumnHelper<TopQueryRow>();
+
+export const topPagesColumns = [
+  pagesHelper.accessor("url", {
+    id: "url",
+    header: () => <span className="uppercase tracking-wider">URL</span>,
+    enableSorting: false,
+    cell: ({ row }) => (
+      <>
+        <a
+          href={row.original.url}
+          target="_blank"
+          rel="noreferrer"
+          className="link link-primary inline-flex items-start gap-1 break-all"
+        >
+          <span className="break-all">
+            {formatUrlForDisplay(row.original.url)}
+          </span>
+          <ExternalLink className="mt-1 size-3 shrink-0" />
+        </a>
+        {row.original.domain ? (
+          <p className="text-xs text-base-content/50">{row.original.domain}</p>
+        ) : null}
+      </>
+    ),
+  }),
+  pagesHelper.accessor("platform", {
+    id: "platform",
+    header: () => <span className="uppercase tracking-wider">Platform</span>,
+    enableSorting: false,
+    cell: ({ getValue }) => <PlatformBadge platform={getValue()} />,
+  }),
+  pagesHelper.accessor("mentions", {
+    id: "mentions",
+    header: ({ column }) => (
+      <SortableHeader column={column} label="Mentions" align="right" />
+    ),
+    cell: ({ getValue }) => (
+      <span className="tabular-nums">{formatCount(getValue())}</span>
+    ),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+];
+
+export const topQueriesColumns = [
+  queriesHelper.accessor("question", {
+    id: "question",
+    header: () => <span className="uppercase tracking-wider">Query</span>,
+    enableSorting: false,
+    cell: ({ row }) => (
+      <>
+        <p className="break-words font-medium">{row.original.question}</p>
+        {row.original.brandsMentioned.length > 0 ? (
+          <p className="mt-0.5 text-xs text-base-content/50">
+            Brands: {row.original.brandsMentioned.slice(0, 5).join(", ")}
+          </p>
+        ) : null}
+      </>
+    ),
+  }),
+  queriesHelper.accessor("platform", {
+    id: "platform",
+    header: () => <span className="uppercase tracking-wider">Platform</span>,
+    enableSorting: false,
+    cell: ({ getValue }) => <PlatformBadge platform={getValue()} />,
+  }),
+  queriesHelper.accessor("aiSearchVolume", {
+    id: "aiSearchVolume",
+    header: ({ column }) => (
+      <SortableHeader column={column} label="AI search vol." align="right" />
+    ),
+    cell: ({ getValue }) => (
+      <span className="tabular-nums">{formatCount(getValue())}</span>
+    ),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+];
+
+export function TopPagesTable({ table }: { table: Table<TopPageRow> }) {
+  if (table.getRowModel().rows.length === 0) {
+    return (
+      <p className="p-6 text-center text-sm text-base-content/60">
+        No cited pages returned.
+      </p>
+    );
+  }
+
+  return <BrandLookupTable table={table} urlLikeColumnId="url" />;
+}
+
+export function TopQueriesTable({ table }: { table: Table<TopQueryRow> }) {
+  if (table.getRowModel().rows.length === 0) {
+    return (
+      <p className="p-6 text-center text-sm text-base-content/60">
+        No matching queries found.
+      </p>
+    );
+  }
+
+  return <BrandLookupTable table={table} urlLikeColumnId="question" />;
+}
+
+function BrandLookupTable<T>({
+  table,
+  urlLikeColumnId,
+}: {
+  table: Table<T>;
+  urlLikeColumnId: string;
+}) {
+  return (
+    <div className="overflow-x-auto">
+      <table className="table table-sm">
+        <thead>
+          {table.getHeaderGroups().map((headerGroup) => (
+            <tr key={headerGroup.id}>
+              {headerGroup.headers.map((header) => {
+                const isNumeric = header.column.getCanSort();
+                return (
+                  <th
+                    key={header.id}
+                    className={`text-xs uppercase tracking-wider text-base-content/60 ${
+                      isNumeric ? "text-right" : ""
+                    }`}
+                  >
+                    {header.isPlaceholder
+                      ? null
+                      : flexRender(
+                          header.column.columnDef.header,
+                          header.getContext(),
+                        )}
+                  </th>
+                );
+              })}
+            </tr>
+          ))}
+        </thead>
+        <tbody>
+          {table.getRowModel().rows.map((row) => (
+            <tr key={row.id}>
+              {row.getVisibleCells().map((cell) => {
+                const isNumeric = cell.column.getCanSort();
+                return (
+                  <td
+                    key={cell.id}
+                    className={cellClassName(
+                      cell.column.id,
+                      urlLikeColumnId,
+                      isNumeric,
+                    )}
+                  >
+                    {flexRender(cell.column.columnDef.cell, cell.getContext())}
+                  </td>
+                );
+              })}
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+}
+
+function cellClassName(
+  columnId: string,
+  urlLikeColumnId: string,
+  isNumeric: boolean,
+): string {
+  if (columnId === urlLikeColumnId) {
+    return "min-w-80 max-w-2xl align-top";
+  }
+  if (isNumeric) {
+    return "whitespace-nowrap text-right align-top";
+  }
+  return "whitespace-nowrap align-top";
+}

src/client/features/ai-search/components/BrandLookupFilterPanel.tsx

@@ -0,0 +1,235 @@
+import { RotateCcw } from "lucide-react";
+import type { CitationTab } from "@/client/features/ai-search/brandLookupFilterTypes";
+import { formatPlatformLabel } from "@/client/features/ai-search/platformLabels";
+import type { BrandLookupFiltersState } from "@/client/features/ai-search/useBrandLookupFilters";
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type AnyForm = { Field: React.ComponentType<any> };
+
+function FilterTextInput({
+  form,
+  name,
+  label,
+  placeholder,
+}: {
+  form: AnyForm;
+  name: string;
+  label: string;
+  placeholder: string;
+}) {
+  return (
+    <label className="form-control gap-1.5">
+      <span className="text-[11px] font-semibold uppercase tracking-wide text-base-content/60">
+        {label}
+      </span>
+      <form.Field name={name}>
+        {(field: {
+          state: { value: string };
+          handleChange: (v: string) => void;
+        }) => (
+          <input
+            className="input input-bordered input-sm w-full bg-base-100"
+            placeholder={placeholder}
+            value={field.state.value}
+            onChange={(event) => field.handleChange(event.target.value)}
+          />
+        )}
+      </form.Field>
+    </label>
+  );
+}
+
+function FilterRangeInputs({
+  form,
+  title,
+  minName,
+  maxName,
+}: {
+  form: AnyForm;
+  title: string;
+  minName: string;
+  maxName: string;
+}) {
+  return (
+    <div className="rounded-lg border border-base-300 bg-base-100 p-2.5 space-y-2">
+      <p className="text-[11px] font-semibold uppercase tracking-wide text-base-content/60">
+        {title}
+      </p>
+      <div className="grid grid-cols-2 gap-2">
+        <CompactRangeInput form={form} name={minName} placeholder="Min" />
+        <CompactRangeInput form={form} name={maxName} placeholder="Max" />
+      </div>
+    </div>
+  );
+}
+
+function CompactRangeInput({
+  form,
+  name,
+  placeholder,
+}: {
+  form: AnyForm;
+  name: string;
+  placeholder: string;
+}) {
+  return (
+    <form.Field name={name}>
+      {(field: {
+        state: { value: string };
+        handleChange: (v: string) => void;
+      }) => (
+        <input
+          className="input input-bordered input-xs bg-base-100"
+          placeholder={placeholder}
+          type="number"
+          value={field.state.value}
+          onChange={(event) => field.handleChange(event.target.value)}
+        />
+      )}
+    </form.Field>
+  );
+}
+
+function PlatformToggle({ form }: { form: AnyForm }) {
+  return (
+    <div className="space-y-1.5">
+      <p className="text-[11px] font-semibold uppercase tracking-wide text-base-content/60">
+        Platform
+      </p>
+      <form.Field name="platform">
+        {(field: {
+          state: { value: string };
+          handleChange: (v: string) => void;
+        }) => (
+          <div className="flex flex-wrap items-center gap-1">
+            {(["", "chat_gpt", "google"] as const).map((value) => (
+              <button
+                key={value || "all"}
+                type="button"
+                className={`btn btn-xs ${field.state.value === value ? "btn-soft" : "btn-ghost"}`}
+                onClick={() => field.handleChange(value)}
+              >
+                {value === "" ? "All" : formatPlatformLabel(value)}
+              </button>
+            ))}
+          </div>
+        )}
+      </form.Field>
+    </div>
+  );
+}
+
+function TopPagesFilters({
+  form,
+}: {
+  form: BrandLookupFiltersState["pages"]["form"];
+}) {
+  return (
+    <>
+      <div className="grid grid-cols-1 gap-3 lg:grid-cols-2">
+        <FilterTextInput
+          form={form}
+          name="include"
+          label="Include Terms"
+          placeholder="reddit, forbes"
+        />
+        <FilterTextInput
+          form={form}
+          name="exclude"
+          label="Exclude Terms"
+          placeholder="pinterest, /tag"
+        />
+      </div>
+
+      <div className="flex flex-wrap items-end gap-4">
+        <PlatformToggle form={form} />
+        <div className="min-w-[220px]">
+          <FilterRangeInputs
+            form={form}
+            title="Mentions"
+            minName="minMentions"
+            maxName="maxMentions"
+          />
+        </div>
+      </div>
+    </>
+  );
+}
+
+function QueriesFilters({
+  form,
+}: {
+  form: BrandLookupFiltersState["queries"]["form"];
+}) {
+  return (
+    <>
+      <div className="grid grid-cols-1 gap-3 lg:grid-cols-2">
+        <FilterTextInput
+          form={form}
+          name="include"
+          label="Include Terms"
+          placeholder="pricing, reviews"
+        />
+        <FilterTextInput
+          form={form}
+          name="exclude"
+          label="Exclude Terms"
+          placeholder="login, download"
+        />
+      </div>
+
+      <div className="flex flex-wrap items-end gap-4">
+        <PlatformToggle form={form} />
+        <div className="min-w-[220px]">
+          <FilterRangeInputs
+            form={form}
+            title="AI search volume"
+            minName="minVolume"
+            maxName="maxVolume"
+          />
+        </div>
+      </div>
+    </>
+  );
+}
+
+export function BrandLookupFilterPanel({
+  activeTab,
+  filters,
+}: {
+  activeTab: CitationTab;
+  filters: BrandLookupFiltersState;
+}) {
+  const current = filters[activeTab];
+
+  return (
+    <div className="shrink-0 border-b border-base-300 bg-gradient-to-b from-base-100 to-base-200/30 px-4 py-3 space-y-3">
+      <div className="flex flex-wrap items-center justify-between gap-2">
+        <div className="flex items-center gap-2">
+          <p className="text-sm font-semibold">Refine results</p>
+          {current.activeFilterCount > 0 ? (
+            <span className="badge badge-xs badge-primary border-0 text-primary-content">
+              {current.activeFilterCount} active
+            </span>
+          ) : null}
+        </div>
+        <button
+          type="button"
+          className="btn btn-xs btn-ghost gap-1"
+          onClick={current.reset}
+          disabled={current.activeFilterCount === 0}
+        >
+          <RotateCcw className="size-3" />
+          Clear all
+        </button>
+      </div>
+
+      {activeTab === "pages" ? (
+        <TopPagesFilters form={filters.pages.form} />
+      ) : null}
+      {activeTab === "queries" ? (
+        <QueriesFilters form={filters.queries.form} />
+      ) : null}
+    </div>
+  );
+}

src/client/features/ai-search/components/BrandLookupHistorySection.tsx

@@ -0,0 +1,24 @@
+import { Sparkles } from "lucide-react";
+import { SearchHistorySection } from "@/client/features/ai-search/components/SearchHistorySection";
+import type { BrandLookupSearchHistoryItem } from "@/client/hooks/useBrandLookupSearchHistory";
+
+type Props = {
+  history: BrandLookupSearchHistoryItem[];
+  historyLoaded: boolean;
+  onRemoveHistoryItem: (timestamp: number) => void;
+  onSelectHistoryItem: (item: BrandLookupSearchHistoryItem) => void;
+};
+
+export function BrandLookupHistorySection(props: Props) {
+  return (
+    <SearchHistorySection
+      {...props}
+      emptyIcon={Sparkles}
+      emptyMessage="Search a brand name or domain to see how AI cites it"
+      noun="lookup"
+      renderItem={(item) => (
+        <p className="font-medium text-base-content truncate">{item.query}</p>
+      )}
+    />
+  );
+}

src/client/features/ai-search/components/BrandLookupMentionTrendCard.tsx

@@ -0,0 +1,95 @@
+import { useMemo } from "react";
+import {
+  CartesianGrid,
+  Line,
+  LineChart,
+  ResponsiveContainer,
+  Tooltip,
+  XAxis,
+  YAxis,
+} from "recharts";
+import { formatCount } from "@/client/features/ai-search/platformLabels";
+import type { BrandLookupResult } from "@/types/schemas/ai-search";
+
+type Props = {
+  result: BrandLookupResult;
+};
+
+export function BrandLookupMentionTrendCard({ result }: Props) {
+  const chartData = useMemo(
+    () =>
+      result.monthlyVolume.map((entry) => ({
+        label: `${entry.year}-${String(entry.month).padStart(2, "0")}`,
+        volume: entry.volume ?? 0,
+      })),
+    [result.monthlyVolume],
+  );
+
+  if (chartData.length === 0) {
+    return (
+      <div className="flex h-56 items-center justify-center text-sm text-base-content/60">
+        Not enough historical data yet.
+      </div>
+    );
+  }
+
+  return (
+    <div className="h-56">
+      <ResponsiveContainer width="100%" height="100%">
+        <LineChart
+          data={chartData}
+          margin={{ top: 12, right: 12, bottom: 4, left: 0 }}
+        >
+          <CartesianGrid
+            strokeDasharray="3 3"
+            stroke="currentColor"
+            opacity={0.12}
+          />
+          <XAxis
+            dataKey="label"
+            tick={{ fontSize: 11, fill: "#888" }}
+            tickLine={false}
+            axisLine={false}
+          />
+          <YAxis
+            tick={{ fontSize: 11, fill: "#888" }}
+            tickLine={false}
+            axisLine={false}
+            allowDecimals={false}
+          />
+          <Tooltip
+            content={<MentionTooltip />}
+            cursor={{ stroke: "currentColor", strokeOpacity: 0.2 }}
+          />
+          <Line
+            type="monotone"
+            dataKey="volume"
+            stroke="hsl(220 70% 50%)"
+            strokeWidth={2}
+            dot={false}
+          />
+        </LineChart>
+      </ResponsiveContainer>
+    </div>
+  );
+}
+
+function MentionTooltip({
+  active,
+  payload,
+  label,
+}: {
+  active?: boolean;
+  payload?: Array<{ value: number }>;
+  label?: string;
+}) {
+  if (!active || !payload?.length) return null;
+  return (
+    <div className="rounded-md border border-base-300 bg-base-100 px-3 py-2 shadow-sm">
+      <p className="text-xs text-base-content/60">{label}</p>
+      <p className="text-sm font-medium tabular-nums">
+        {formatCount(payload[0].value)} mentions
+      </p>
+    </div>
+  );
+}

src/client/features/ai-search/components/BrandLookupResults.tsx

@@ -0,0 +1,420 @@
+import { useMemo, useState } from "react";
+import {
+  getCoreRowModel,
+  getSortedRowModel,
+  useReactTable,
+  type SortingState,
+} from "@tanstack/react-table";
+import { Download, Info, SlidersHorizontal } from "lucide-react";
+import { buildCsv, downloadCsv } from "@/client/lib/csv";
+import { BrandLookupMentionTrendCard } from "@/client/features/ai-search/components/BrandLookupMentionTrendCard";
+import { BrandLookupFilterPanel } from "@/client/features/ai-search/components/BrandLookupFilterPanel";
+import {
+  TopPagesTable,
+  TopQueriesTable,
+  topPagesColumns,
+  topQueriesColumns,
+} from "@/client/features/ai-search/components/BrandLookupCitationTables";
+import {
+  formatCount,
+  formatPlatformLabel,
+} from "@/client/features/ai-search/platformLabels";
+import {
+  filterQueries,
+  filterTopPages,
+} from "@/client/features/ai-search/brandLookupFiltering";
+import { useBrandLookupFilters } from "@/client/features/ai-search/useBrandLookupFilters";
+import type { CitationTab } from "@/client/features/ai-search/brandLookupFilterTypes";
+import type { BrandLookupResult } from "@/types/schemas/ai-search";
+
+type Props = {
+  result: BrandLookupResult;
+};
+
+type PlatformRow = BrandLookupResult["perPlatform"][number];
+type MetricKey = "mentions" | "aiSearchVolume" | "impressions";
+
+const PLATFORM_DOT_CLASS: Record<PlatformRow["platform"], string> = {
+  chat_gpt: "bg-emerald-500",
+  google: "bg-sky-500",
+};
+
+export function BrandLookupResults({ result }: Props) {
+  const erroredPlatforms = result.perPlatform.filter(
+    (p) => p.status === "error",
+  );
+  const allPlatformsErrored =
+    erroredPlatforms.length === result.perPlatform.length &&
+    result.perPlatform.length > 0;
+
+  if (!result.hasData) {
+    if (allPlatformsErrored) {
+      return (
+        <div className="rounded-lg border border-warning/30 bg-warning/10 p-4 text-sm">
+          AI mention data is temporarily unavailable for{" "}
+          <strong>{result.resolvedTarget}</strong>. Please try again shortly.
+        </div>
+      );
+    }
+    return (
+      <div className="space-y-3">
+        <div className="rounded-lg border border-info/30 bg-info/10 p-4 text-sm">
+          No AI mentions found for <strong>{result.resolvedTarget}</strong>.
+        </div>
+        {erroredPlatforms.length > 0 ? (
+          <p className="text-xs text-base-content/60">
+            Note: {formatPlatformList(erroredPlatforms.map((p) => p.platform))}{" "}
+            {erroredPlatforms.length === 1 ? "was" : "were"} unavailable — some
+            mentions may be missing.
+          </p>
+        ) : null}
+      </div>
+    );
+  }
+
+  const hasTrendData = result.monthlyVolume.length > 0;
+
+  return (
+    <div className="space-y-6">
+      <BrandHeader result={result} />
+      <div
+        className={`grid gap-4 ${hasTrendData ? "lg:grid-cols-2" : "grid-cols-1"}`}
+      >
+        <KpiTiles result={result} />
+        {hasTrendData ? <MentionTrendCard result={result} /> : null}
+      </div>
+      <CitationTabsCard result={result} />
+    </div>
+  );
+}
+
+function formatPlatformList(platforms: PlatformRow["platform"][]): string {
+  return platforms.map(formatPlatformLabel).join(" and ");
+}
+
+function BrandHeader({ result }: { result: BrandLookupResult }) {
+  return (
+    <section className="flex flex-wrap items-baseline justify-between gap-2">
+      <div className="flex flex-wrap items-baseline gap-3">
+        <h2 className="text-3xl font-semibold tracking-tight">
+          {result.resolvedTarget}
+        </h2>
+        <span className="badge badge-ghost badge-sm">
+          {result.detectedTargetType}
+        </span>
+      </div>
+      <p className="text-xs text-base-content/50">
+        Updated {formatRelative(result.fetchedAt)}
+      </p>
+    </section>
+  );
+}
+
+function KpiTiles({ result }: { result: BrandLookupResult }) {
+  return (
+    <section className="flex flex-col divide-y divide-base-200 overflow-hidden rounded-xl border border-base-300 bg-base-100">
+      <KpiTile
+        label="Total mentions"
+        tooltip="Number of LLM answers where your domain appeared in the text or citations."
+        total={result.totalMentions}
+        perPlatform={result.perPlatform}
+        metric="mentions"
+      />
+      <KpiTile
+        label="AI search volume"
+        tooltip="Monthly volume of user prompts on topics where your domain shows up in LLM answers."
+        total={result.totalAiSearchVolume}
+        perPlatform={result.perPlatform}
+        metric="aiSearchVolume"
+      />
+      <KpiTile
+        label="Estimated impressions"
+        tooltip="How often your domain is shown to users across LLM answers, based on mention frequency and topic search volume."
+        total={result.totalImpressions}
+        perPlatform={result.perPlatform}
+        metric="impressions"
+      />
+    </section>
+  );
+}
+
+function KpiTile({
+  label,
+  tooltip,
+  total,
+  perPlatform,
+  metric,
+}: {
+  label: string;
+  tooltip: string;
+  total: number | null;
+  perPlatform: PlatformRow[];
+  metric: MetricKey;
+}) {
+  return (
+    <div className="flex flex-1 items-center justify-between gap-6 px-5 py-3">
+      <div className="min-w-0">
+        <p className="inline-flex items-center gap-1 text-xs font-medium uppercase tracking-wider text-base-content/50">
+          {label}
+          <span
+            className="tooltip tooltip-right inline-flex normal-case"
+            data-tip={tooltip}
+          >
+            <Info className="size-3 text-base-content/40" />
+          </span>
+        </p>
+        <p className="mt-1 text-2xl font-semibold tabular-nums">
+          {formatCount(total)}
+        </p>
+      </div>
+      <div className="flex shrink-0 flex-col gap-1.5 min-w-[12rem]">
+        {perPlatform.map((row) => (
+          <PlatformStatRow key={row.platform} row={row} metric={metric} />
+        ))}
+      </div>
+    </div>
+  );
+}
+
+function PlatformStatRow({
+  row,
+  metric,
+}: {
+  row: PlatformRow;
+  metric: MetricKey;
+}) {
+  const value = row.status === "error" ? null : row[metric];
+
+  return (
+    <div className="flex items-center justify-between text-xs">
+      <span className="inline-flex items-center gap-1.5 text-base-content/70">
+        <span
+          className={`size-1.5 rounded-full ${PLATFORM_DOT_CLASS[row.platform]}`}
+        />
+        {formatPlatformLabel(row.platform)}
+        {row.platform === "chat_gpt" ? (
+          <span
+            className="tooltip tooltip-right inline-flex"
+            data-tip="DataForSEO indexes ChatGPT mentions for US English only — country selection is not available for this platform."
+          >
+            <Info className="size-3 text-base-content/40" />
+          </span>
+        ) : null}
+        {row.status === "error" ? (
+          <span className="text-error">unavailable</span>
+        ) : null}
+      </span>
+      <span className="font-medium tabular-nums text-base-content/90">
+        {formatCount(value)}
+      </span>
+    </div>
+  );
+}
+
+function MentionTrendCard({ result }: { result: BrandLookupResult }) {
+  return (
+    <section className="overflow-hidden rounded-xl border border-base-300 bg-base-100">
+      <div className="border-b border-base-300 px-4 py-3">
+        <h3 className="text-sm font-semibold">
+          Mention trend (last 12 months)
+        </h3>
+      </div>
+      <div className="p-4">
+        <BrandLookupMentionTrendCard result={result} />
+      </div>
+    </section>
+  );
+}
+
+const DEFAULT_PAGES_SORT: SortingState = [{ id: "mentions", desc: true }];
+const DEFAULT_QUERIES_SORT: SortingState = [
+  { id: "aiSearchVolume", desc: true },
+];
+
+function CitationTabsCard({ result }: { result: BrandLookupResult }) {
+  const [activeTab, setActiveTab] = useState<CitationTab>("queries");
+  const [pagesSort, setPagesSort] = useState<SortingState>(DEFAULT_PAGES_SORT);
+  const [queriesSort, setQueriesSort] =
+    useState<SortingState>(DEFAULT_QUERIES_SORT);
+  const filters = useBrandLookupFilters();
+
+  const filteredPages = useMemo(
+    () => filterTopPages(result.topPages, filters.pages.values),
+    [result.topPages, filters.pages.values],
+  );
+  const filteredQueries = useMemo(
+    () => filterQueries(result.topQueries, filters.queries.values),
+    [result.topQueries, filters.queries.values],
+  );
+
+  const pagesTable = useReactTable({
+    data: filteredPages,
+    columns: topPagesColumns,
+    state: { sorting: pagesSort },
+    onSortingChange: setPagesSort,
+    getCoreRowModel: getCoreRowModel(),
+    getSortedRowModel: getSortedRowModel(),
+  });
+  const queriesTable = useReactTable({
+    data: filteredQueries,
+    columns: topQueriesColumns,
+    state: { sorting: queriesSort },
+    onSortingChange: setQueriesSort,
+    getCoreRowModel: getCoreRowModel(),
+    getSortedRowModel: getSortedRowModel(),
+  });
+
+  const handleExport = () => {
+    if (activeTab === "pages") {
+      const sortedPages = pagesTable
+        .getSortedRowModel()
+        .rows.map((row) => row.original);
+      const csv = buildCsv(
+        ["URL", "Domain", "Platform", "Mentions"],
+        sortedPages.map((row) => [
+          row.url,
+          row.domain ?? "",
+          formatPlatformLabel(row.platform),
+          row.mentions ?? "",
+        ]),
+      );
+      downloadCsv(
+        `ai-brand-lookup-pages-${slugify(result.resolvedTarget)}.csv`,
+        csv,
+      );
+      return;
+    }
+    const sortedQueries = queriesTable
+      .getSortedRowModel()
+      .rows.map((row) => row.original);
+    const csv = buildCsv(
+      ["Query", "Platform", "AI search volume", "First seen", "Last seen"],
+      sortedQueries.map((row) => [
+        row.question,
+        formatPlatformLabel(row.platform),
+        row.aiSearchVolume ?? "",
+        row.firstSeenAt ?? "",
+        row.lastSeenAt ?? "",
+      ]),
+    );
+    downloadCsv(
+      `ai-brand-lookup-queries-${slugify(result.resolvedTarget)}.csv`,
+      csv,
+    );
+  };
+
+  const canExport =
+    activeTab === "pages"
+      ? filteredPages.length > 0
+      : filteredQueries.length > 0;
+
+  const currentFilterCount = filters[activeTab].activeFilterCount;
+
+  return (
+    <section className="overflow-hidden rounded-xl border border-base-300 bg-base-100">
+      <div className="flex items-center justify-between gap-3 border-b border-base-300 px-4 py-3">
+        <div role="tablist" className="tabs tabs-box w-fit">
+          <button
+            type="button"
+            role="tab"
+            className={`tab ${activeTab === "queries" ? "tab-active" : ""}`}
+            onClick={() => setActiveTab("queries")}
+          >
+            Queries
+          </button>
+          <button
+            type="button"
+            role="tab"
+            className={`tab ${activeTab === "pages" ? "tab-active" : ""}`}
+            onClick={() => setActiveTab("pages")}
+          >
+            Related pages
+          </button>
+        </div>
+
+        <button
+          type="button"
+          className="btn btn-ghost btn-sm gap-1.5"
+          onClick={handleExport}
+          disabled={!canExport}
+          aria-label="Export current tab as CSV"
+        >
+          <Download className="size-3.5" />
+          Export CSV
+        </button>
+      </div>
+
+      <div className="flex items-center gap-2 border-b border-base-300 px-4 py-2">
+        <button
+          type="button"
+          className={`btn btn-ghost btn-sm gap-1.5 ${filters.showFilters ? "btn-active" : ""}`}
+          onClick={() => filters.setShowFilters((current) => !current)}
+          title="Toggle table filters"
+        >
+          <SlidersHorizontal className="size-3.5" />
+          Filters
+          {currentFilterCount > 0 ? (
+            <span className="badge badge-xs badge-primary border-0 text-primary-content">
+              {currentFilterCount}
+            </span>
+          ) : null}
+        </button>
+      </div>
+
+      <div className="border-b border-base-300 px-4 py-2 text-xs text-base-content/60">
+        {activeTab === "pages" ? (
+          <>
+            Other pages LLMs cited in the same answers that referenced{" "}
+            <strong className="text-base-content/80">
+              {result.resolvedTarget}
+            </strong>
+            . Useful for spotting the sources competing for attention alongside
+            your domain.
+          </>
+        ) : (
+          <>
+            User prompts where the LLM's answer referenced{" "}
+            <strong className="text-base-content/80">
+              {result.resolvedTarget}
+            </strong>{" "}
+            in its text or citations. The prompt itself does not have to mention
+            your domain.
+          </>
+        )}
+      </div>
+
+      {filters.showFilters ? (
+        <BrandLookupFilterPanel activeTab={activeTab} filters={filters} />
+      ) : null}
+
+      {activeTab === "pages" ? (
+        <TopPagesTable table={pagesTable} />
+      ) : (
+        <TopQueriesTable table={queriesTable} />
+      )}
+    </section>
+  );
+}
+
+function formatRelative(iso: string): string {
+  const date = new Date(iso);
+  if (Number.isNaN(date.getTime())) return "just now";
+
+  const diffMs = Date.now() - date.getTime();
+  const diffMin = Math.floor(diffMs / 60_000);
+
+  if (diffMin < 1) return "just now";
+  if (diffMin < 60) return `${diffMin}m ago`;
+  const diffHr = Math.floor(diffMin / 60);
+  if (diffHr < 24) return `${diffHr}h ago`;
+  const diffDay = Math.floor(diffHr / 24);
+  return `${diffDay}d ago`;
+}
+
+function slugify(value: string): string {
+  return value
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "")
+    .slice(0, 60);
+}

src/client/features/ai-search/components/BrandLookupSearchCard.tsx

@@ -0,0 +1,90 @@
+import type { FormEvent } from "react";
+import { Search } from "lucide-react";
+import { isHostedClientAuthMode } from "@/lib/auth-mode";
+import { applyBillingMarkupUsd } from "@/shared/billing";
+import { BRAND_LOOKUP_MAX_INPUT_LENGTH } from "@/types/schemas/ai-search";
+
+type Props = {
+  query: string;
+  onQueryChange: (next: string) => void;
+  onSubmit: (event: FormEvent) => void;
+  isLoading: boolean;
+  validationError: string | null;
+};
+
+/**
+ * One brand lookup = 6 DataForSEO calls (3 endpoints × 2 platforms). Measured
+ * live at ~$0.634 raw via `pnpm billing:brand-lookup`; rounded up to leave
+ * headroom for per-query variance.
+ */
+const BRAND_LOOKUP_RAW_COST_USD = 0.65;
+
+// Hosted customers are billed the marked-up USD; self-hosted users pay
+// DataForSEO directly at the raw rate.
+const BRAND_LOOKUP_DISPLAYED_COST_USD = isHostedClientAuthMode()
+  ? applyBillingMarkupUsd(BRAND_LOOKUP_RAW_COST_USD)
+  : BRAND_LOOKUP_RAW_COST_USD;
+
+export function BrandLookupSearchCard({
+  query,
+  onQueryChange,
+  onSubmit,
+  isLoading,
+  validationError,
+}: Props) {
+  return (
+    <div className="card border border-base-300 bg-base-100">
+      <div className="card-body gap-4">
+        <form
+          onSubmit={onSubmit}
+          className="flex flex-col gap-3 lg:flex-row lg:items-center"
+        >
+          <label
+            className={`input input-bordered flex flex-1 items-center gap-2 ${
+              validationError ? "input-error" : ""
+            }`}
+          >
+            <Search className="size-4 text-base-content/60" />
+            <input
+              type="text"
+              placeholder="Enter a brand name or domain"
+              value={query}
+              maxLength={BRAND_LOOKUP_MAX_INPUT_LENGTH}
+              onChange={(event) => onQueryChange(event.target.value)}
+              aria-invalid={validationError ? true : undefined}
+              aria-describedby={
+                validationError ? "brand-lookup-input-error" : undefined
+              }
+              autoComplete="off"
+              spellCheck={false}
+              className="grow"
+            />
+          </label>
+
+          <button
+            type="submit"
+            className="btn btn-primary px-6"
+            disabled={isLoading}
+          >
+            {isLoading ? "Looking up..." : "Look up"}
+          </button>
+        </form>
+
+        {validationError ? (
+          <p id="brand-lookup-input-error" className="text-sm text-error">
+            {validationError}
+          </p>
+        ) : null}
+
+        <div className="flex flex-wrap items-center gap-3 text-xs text-base-content/60">
+          <p className="tabular-nums">
+            Est.{" "}
+            <span className="font-medium text-base-content/80">
+              ${BRAND_LOOKUP_DISPLAYED_COST_USD.toFixed(2)}
+            </span>
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}

src/client/features/ai-search/components/MarkdownAnswer.tsx

@@ -0,0 +1,282 @@
+import {
+  useLayoutEffect,
+  useRef,
+  useState,
+  type ComponentPropsWithoutRef,
+  type ReactNode,
+} from "react";
+import { ChevronDown, ChevronUp } from "lucide-react";
+import Markdown from "react-markdown";
+import remarkGfm from "remark-gfm";
+
+type Props = {
+  text: string;
+};
+
+/**
+ * Collapsed-state max height in px. Roughly 9 lines of body text — enough
+ * to convey the shape of an answer without dominating the page when four
+ * models are stacked.
+ */
+const COLLAPSED_MAX_PX = 240;
+
+/**
+ * Render an LLM's markdown answer with explicit per-element Tailwind classes.
+ *
+ * Long answers collapse to ~12 lines with a fade-out gradient and a
+ * "Read more" toggle so a side-by-side comparison of four models stays
+ * scannable. We measure the rendered scroll height to decide whether the
+ * toggle is needed.
+ *
+ * Anchor URLs are sanitized to http(s) only — LLMs can be coaxed into
+ * emitting `javascript:` payloads.
+ */
+export function MarkdownAnswer({ text }: Props) {
+  const contentRef = useRef<HTMLDivElement>(null);
+  const [expanded, setExpanded] = useState(false);
+  const [needsCollapse, setNeedsCollapse] = useState(false);
+  const { thinking, body } = extractThinkingBlocks(text);
+  const normalized = normalizeLlmMarkdown(body);
+
+  useLayoutEffect(() => {
+    const el = contentRef.current;
+    if (!el) return;
+    // scrollHeight reflects natural content height even when overflow is
+    // clipped by max-h, so we can detect overflow without toggling state.
+    setNeedsCollapse(el.scrollHeight > COLLAPSED_MAX_PX + 8);
+  }, [normalized]);
+
+  if (normalized.trim().length === 0 && thinking.length === 0) {
+    return (
+      <p className="text-sm text-base-content/60 italic">
+        Model returned an empty response.
+      </p>
+    );
+  }
+
+  const isCollapsed = needsCollapse && !expanded;
+
+  return (
+    <div className="text-sm leading-relaxed">
+      {thinking.map((block, index) => (
+        <ThinkingBlock key={index} text={block} />
+      ))}
+
+      {normalized.trim().length > 0 ? (
+        <div className="relative">
+          <div
+            ref={contentRef}
+            style={
+              isCollapsed ? { maxHeight: `${COLLAPSED_MAX_PX}px` } : undefined
+            }
+            className={isCollapsed ? "overflow-hidden" : undefined}
+          >
+            <Markdown
+              remarkPlugins={[remarkGfm]}
+              components={MARKDOWN_COMPONENTS}
+            >
+              {normalized}
+            </Markdown>
+          </div>
+
+          {isCollapsed ? (
+            <div
+              aria-hidden
+              className="pointer-events-none absolute inset-x-0 bottom-0 h-16 bg-gradient-to-t from-base-100 to-transparent"
+            />
+          ) : null}
+        </div>
+      ) : null}
+
+      {needsCollapse ? (
+        <button
+          type="button"
+          onClick={() => setExpanded((prev) => !prev)}
+          className="mt-2 inline-flex items-center gap-1 text-xs font-medium text-primary hover:underline"
+          aria-expanded={expanded}
+        >
+          {expanded ? (
+            <>
+              <ChevronUp className="size-3.5" />
+              Show less
+            </>
+          ) : (
+            <>
+              <ChevronDown className="size-3.5" />
+              Read more
+            </>
+          )}
+        </button>
+      ) : null}
+    </div>
+  );
+}
+
+function ThinkingBlock({ text }: { text: string }) {
+  return (
+    <details
+      open
+      className="group mb-3 rounded-lg border border-base-300 bg-base-200/40"
+    >
+      <summary className="flex cursor-pointer list-none items-center gap-2 px-3 py-2 text-xs font-medium text-base-content/70 hover:text-base-content">
+        <ChevronDown className="size-3.5 transition-transform group-open:rotate-180" />
+        Model Thinking
+      </summary>
+      <pre className="overflow-x-auto whitespace-pre-wrap break-words rounded-b-lg border-t border-base-300 bg-base-200/60 px-3 py-2.5 text-xs font-mono text-base-content/80">
+        {text}
+      </pre>
+    </details>
+  );
+}
+
+/**
+ * Reasoning models (e.g. Perplexity sonar-reasoning-pro) wrap their chain of
+ * thought in `<think>...</think>` tags inline with the answer. Pull those out
+ * so we can render them in a separate, collapsible block.
+ *
+ * Tolerates an unclosed final `<think>` (e.g. from a truncated stream) by
+ * treating everything after it as a thinking block.
+ */
+function extractThinkingBlocks(text: string): {
+  thinking: string[];
+  body: string;
+} {
+  const thinking: string[] = [];
+  let body = text;
+
+  body = body.replace(/<think>([\s\S]*?)<\/think>/gi, (_, inner: string) => {
+    thinking.push(inner.trim());
+    return "";
+  });
+
+  body = body.replace(/<think>([\s\S]*)$/i, (_, inner: string) => {
+    thinking.push(inner.trim());
+    return "";
+  });
+
+  return { thinking, body };
+}
+
+/**
+ * Fix a class of malformed markdown we see from LLM responses: a list marker
+ * (`-`, `*`, `+`, or `1.`) on a line by itself, followed by a blank line,
+ * followed by the actual item content as a separate paragraph. Default
+ * markdown correctly renders that as an empty bullet + detached paragraph,
+ * which looks broken. Collapse the blank line so the marker and content
+ * form a proper list item.
+ */
+function normalizeLlmMarkdown(text: string): string {
+  return text.replace(
+    /^([ \t]*)([-*+]|\d+\.)[ \t]*\r?\n[ \t]*\r?\n(?=\S)(?![ \t]*(?:[-*+]|\d+\.)[ \t])/gm,
+    "$1$2 ",
+  );
+}
+
+type AnchorProps = ComponentPropsWithoutRef<"a">;
+
+function SafeAnchor({ href, children, ...rest }: AnchorProps) {
+  const safeHref = isHttpUrl(href) ? href : undefined;
+  if (!safeHref) {
+    return <span className="underline decoration-dotted">{children}</span>;
+  }
+  return (
+    <a
+      {...rest}
+      href={safeHref}
+      target="_blank"
+      rel="noreferrer"
+      className="link link-primary"
+    >
+      {children}
+    </a>
+  );
+}
+
+function isHttpUrl(value: string | undefined): value is string {
+  if (!value) return false;
+  try {
+    const url = new URL(value);
+    if (url.protocol !== "http:" && url.protocol !== "https:") return false;
+    // Mirror server-side `safeHttpUrl` — a `user:pass@host` URL shows one
+    // hostname in link text while auth hits another.
+    if (url.username || url.password) return false;
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+const MARKDOWN_COMPONENTS = {
+  h1: ({ children }: { children?: ReactNode }) => (
+    <h1 className="mt-4 mb-2 text-base font-semibold first:mt-0">{children}</h1>
+  ),
+  h2: ({ children }: { children?: ReactNode }) => (
+    <h2 className="mt-4 mb-2 text-sm font-semibold first:mt-0">{children}</h2>
+  ),
+  h3: ({ children }: { children?: ReactNode }) => (
+    <h3 className="mt-3 mb-1.5 text-sm font-semibold first:mt-0">{children}</h3>
+  ),
+  h4: ({ children }: { children?: ReactNode }) => (
+    <h4 className="mt-3 mb-1 text-sm font-semibold first:mt-0">{children}</h4>
+  ),
+  p: ({ children }: { children?: ReactNode }) => (
+    <p className="my-2 first:mt-0 last:mb-0">{children}</p>
+  ),
+  ul: ({ children }: { children?: ReactNode }) => (
+    <ul className="my-2 ml-5 list-disc space-y-1">{children}</ul>
+  ),
+  ol: ({ children }: { children?: ReactNode }) => (
+    <ol className="my-2 ml-5 list-decimal space-y-1">{children}</ol>
+  ),
+  li: ({ children }: { children?: ReactNode }) => (
+    <li className="leading-relaxed">{children}</li>
+  ),
+  a: SafeAnchor,
+  strong: ({ children }: { children?: ReactNode }) => (
+    <strong className="font-semibold">{children}</strong>
+  ),
+  em: ({ children }: { children?: ReactNode }) => (
+    <em className="italic">{children}</em>
+  ),
+  blockquote: ({ children }: { children?: ReactNode }) => (
+    <blockquote className="my-2 border-l-2 border-base-300 pl-3 text-base-content/80 italic">
+      {children}
+    </blockquote>
+  ),
+  hr: () => <hr className="my-3 border-base-300" />,
+  code: ({ children, className }: ComponentPropsWithoutRef<"code">) => {
+    // Inline code (no `language-*` className from remark) gets the badge style;
+    // block code is rendered by `pre` with a different shell.
+    if (typeof className === "string" && className.startsWith("language-")) {
+      return <code className={className}>{children}</code>;
+    }
+    return (
+      <code className="rounded bg-base-200 px-1 py-0.5 text-xs font-mono">
+        {children}
+      </code>
+    );
+  },
+  pre: ({ children }: { children?: ReactNode }) => (
+    <pre className="my-2 overflow-x-auto rounded-lg bg-base-200 p-3 text-xs font-mono">
+      {children}
+    </pre>
+  ),
+  table: ({ children }: { children?: ReactNode }) => (
+    <div className="my-3 overflow-x-auto">
+      <table className="table table-xs border border-base-300">
+        {children}
+      </table>
+    </div>
+  ),
+  thead: ({ children }: { children?: ReactNode }) => <thead>{children}</thead>,
+  tbody: ({ children }: { children?: ReactNode }) => <tbody>{children}</tbody>,
+  tr: ({ children }: { children?: ReactNode }) => (
+    <tr className="border-b border-base-300 last:border-0">{children}</tr>
+  ),
+  th: ({ children }: { children?: ReactNode }) => (
+    <th className="px-2 py-1.5 text-left font-semibold">{children}</th>
+  ),
+  td: ({ children }: { children?: ReactNode }) => (
+    <td className="px-2 py-1.5 align-top">{children}</td>
+  ),
+};

src/client/features/ai-search/components/PromptExplorerForm.tsx

@@ -0,0 +1,190 @@
+import type { FormEvent } from "react";
+import {
+  formatCountryLabel,
+  formatModelLabel,
+} from "@/client/features/ai-search/platformLabels";
+import {
+  PROMPT_EXPLORER_MAX_PROMPT_LENGTH,
+  PROMPT_EXPLORER_MODELS,
+  WEB_SEARCH_COUNTRY_CODES,
+  type PromptExplorerModel,
+  type WebSearchCountryCode,
+} from "@/types/schemas/ai-search";
+
+type FormValues = {
+  prompt: string;
+  highlightBrand: string;
+  models: PromptExplorerModel[];
+  webSearch: boolean;
+  webSearchCountryCode: WebSearchCountryCode;
+};
+
+type Props = {
+  form: FormValues;
+  onPromptChange: (value: string) => void;
+  onHighlightBrandChange: (value: string) => void;
+  onModelsChange: (value: PromptExplorerModel[]) => void;
+  onWebSearchChange: (value: boolean) => void;
+  onCountryChange: (value: WebSearchCountryCode) => void;
+  onSubmit: (event: FormEvent) => void;
+  isLoading: boolean;
+  validationError: string | null;
+};
+
+function isCountryCode(value: string): value is WebSearchCountryCode {
+  return (WEB_SEARCH_COUNTRY_CODES as readonly string[]).includes(value);
+}
+
+function parseCountryCode(value: string): WebSearchCountryCode {
+  return isCountryCode(value) ? value : "US";
+}
+
+export function PromptExplorerForm({
+  form,
+  onPromptChange,
+  onHighlightBrandChange,
+  onModelsChange,
+  onWebSearchChange,
+  onCountryChange,
+  onSubmit,
+  isLoading,
+  validationError,
+}: Props) {
+  const toggleModel = (model: PromptExplorerModel) => {
+    if (form.models.includes(model)) {
+      onModelsChange(form.models.filter((m) => m !== model));
+    } else {
+      onModelsChange([...form.models, model]);
+    }
+  };
+
+  const promptCharCount = form.prompt.length;
+  const promptOverLimit = promptCharCount > PROMPT_EXPLORER_MAX_PROMPT_LENGTH;
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="card border border-base-300 bg-base-100"
+    >
+      <div className="card-body gap-5">
+        <div className="space-y-1.5">
+          <label
+            className="block text-sm font-medium"
+            htmlFor="prompt-explorer-prompt"
+          >
+            Prompt
+          </label>
+          <textarea
+            id="prompt-explorer-prompt"
+            className={`textarea textarea-bordered w-full resize-none ${
+              promptOverLimit ? "textarea-error" : ""
+            }`}
+            rows={3}
+            value={form.prompt}
+            maxLength={PROMPT_EXPLORER_MAX_PROMPT_LENGTH + 50}
+            onChange={(event) => onPromptChange(event.target.value)}
+            aria-invalid={promptOverLimit ? true : undefined}
+            autoFocus
+          />
+          <div className="flex items-center justify-between text-xs text-base-content/60">
+            <span>What your customers might ask AI.</span>
+            <span
+              className={`tabular-nums ${promptOverLimit ? "font-medium text-error" : ""}`}
+            >
+              {promptCharCount}/{PROMPT_EXPLORER_MAX_PROMPT_LENGTH}
+            </span>
+          </div>
+        </div>
+
+        <div className="grid grid-cols-1 gap-5 sm:grid-cols-2">
+          <div className="space-y-1.5">
+            <label
+              className="block text-sm font-medium"
+              htmlFor="prompt-explorer-brand"
+            >
+              Highlight brand (optional)
+            </label>
+            <input
+              id="prompt-explorer-brand"
+              type="text"
+              className="input input-bordered w-full"
+              value={form.highlightBrand}
+              onChange={(event) => onHighlightBrandChange(event.target.value)}
+              autoComplete="off"
+              spellCheck={false}
+            />
+            <p className="text-xs text-base-content/60">
+              We&apos;ll flag whether each model mentions this brand.
+            </p>
+          </div>
+
+          <div className="space-y-1.5">
+            <span className="block text-sm font-medium">Models</span>
+            <div className="flex flex-wrap items-center gap-x-5 gap-y-2 pt-1.5">
+              {PROMPT_EXPLORER_MODELS.map((model) => {
+                const isActive = form.models.includes(model);
+                return (
+                  <label
+                    key={model}
+                    className="flex cursor-pointer items-center gap-2"
+                  >
+                    <input
+                      type="checkbox"
+                      className="checkbox checkbox-sm"
+                      checked={isActive}
+                      onChange={() => toggleModel(model)}
+                    />
+                    <span className="text-sm">{formatModelLabel(model)}</span>
+                  </label>
+                );
+              })}
+            </div>
+          </div>
+        </div>
+
+        <div className="flex flex-wrap items-center justify-between gap-3 border-t border-base-300 pt-4">
+          <div className="flex flex-wrap items-center gap-3">
+            <label className="flex cursor-pointer items-center gap-2">
+              <input
+                type="checkbox"
+                className="checkbox checkbox-sm"
+                checked={form.webSearch}
+                onChange={(event) => onWebSearchChange(event.target.checked)}
+              />
+              <span className="text-sm">
+                Allow web search (more current answers)
+              </span>
+            </label>
+            <select
+              id="prompt-explorer-country"
+              aria-label="Web search location"
+              className="select select-bordered select-sm min-w-0 sm:max-w-xs"
+              value={form.webSearchCountryCode}
+              onChange={(event) =>
+                onCountryChange(parseCountryCode(event.target.value))
+              }
+              disabled={!form.webSearch}
+            >
+              {WEB_SEARCH_COUNTRY_CODES.map((code) => (
+                <option key={code} value={code}>
+                  {formatCountryLabel(code)}
+                </option>
+              ))}
+            </select>
+          </div>
+          <button
+            type="submit"
+            className="btn btn-primary"
+            disabled={isLoading || form.models.length === 0}
+          >
+            {isLoading ? "Running…" : "Run"}
+          </button>
+        </div>
+
+        {validationError ? (
+          <p className="text-sm text-error">{validationError}</p>
+        ) : null}
+      </div>
+    </form>
+  );
+}

src/client/features/ai-search/components/PromptExplorerHistorySection.tsx

@@ -0,0 +1,32 @@
+import { MessageSquare } from "lucide-react";
+import { SearchHistorySection } from "@/client/features/ai-search/components/SearchHistorySection";
+import { formatModelLabel } from "@/client/features/ai-search/platformLabels";
+import type { PromptExplorerSearchHistoryItem } from "@/client/hooks/usePromptExplorerSearchHistory";
+
+type Props = {
+  history: PromptExplorerSearchHistoryItem[];
+  historyLoaded: boolean;
+  onRemoveHistoryItem: (timestamp: number) => void;
+  onSelectHistoryItem: (item: PromptExplorerSearchHistoryItem) => void;
+};
+
+export function PromptExplorerHistorySection(props: Props) {
+  return (
+    <SearchHistorySection
+      {...props}
+      emptyIcon={MessageSquare}
+      emptyMessage="Enter a prompt to compare model answers"
+      noun="prompt"
+      renderItem={(item) => (
+        <>
+          <p className="font-medium text-base-content truncate">
+            {item.prompt}
+          </p>
+          <p className="text-sm text-base-content/60 truncate">
+            {item.models.map(formatModelLabel).join(", ")}
+          </p>
+        </>
+      )}
+    />
+  );
+}

src/client/features/ai-search/components/PromptExplorerLoadingState.tsx

@@ -0,0 +1,32 @@
+type Props = {
+  modelCount: number;
+};
+
+export function PromptExplorerLoadingState({ modelCount }: Props) {
+  const count = Math.max(1, modelCount);
+  return (
+    <div className="space-y-5" aria-busy>
+      {Array.from({ length: count }).map((_, index) => (
+        <article
+          key={index}
+          className="overflow-hidden rounded-r-lg border border-base-300 border-l-4 border-l-base-300 bg-base-100"
+        >
+          <header className="flex items-center justify-between border-b border-base-200 bg-base-200/40 px-5 py-3">
+            <div className="flex items-center gap-2">
+              <div className="skeleton size-2 rounded-full" />
+              <div className="skeleton h-4 w-20" />
+              <div className="skeleton h-3 w-32" />
+            </div>
+            <div className="skeleton h-3 w-16" />
+          </header>
+          <div className="space-y-2 px-5 py-5">
+            <div className="skeleton h-3 w-full" />
+            <div className="skeleton h-3 w-11/12" />
+            <div className="skeleton h-3 w-10/12" />
+            <div className="skeleton h-3 w-9/12" />
+          </div>
+        </article>
+      ))}
+    </div>
+  );
+}

src/client/features/ai-search/components/PromptExplorerResults.tsx

@@ -0,0 +1,214 @@
+import {
+  AlertCircle,
+  CheckCircle2,
+  ExternalLink,
+  Globe,
+  XCircle,
+} from "lucide-react";
+import { MarkdownAnswer } from "@/client/features/ai-search/components/MarkdownAnswer";
+import {
+  formatModelLabel,
+  getModelAccent,
+} from "@/client/features/ai-search/platformLabels";
+import { formatUrlForDisplay } from "@/client/features/ai-search/urlDisplay";
+import type {
+  PromptExplorerModelResult,
+  PromptExplorerResult,
+} from "@/types/schemas/ai-search";
+
+type Props = {
+  result: PromptExplorerResult;
+};
+
+export function PromptExplorerResults({ result }: Props) {
+  return (
+    <div className="space-y-5">
+      {result.results.map((modelResult) => (
+        <ModelResultCard
+          key={modelResult.model}
+          modelResult={modelResult}
+          highlightBrand={result.highlightBrand}
+        />
+      ))}
+    </div>
+  );
+}
+
+function ModelResultCard({
+  modelResult,
+  highlightBrand,
+}: {
+  modelResult: PromptExplorerModelResult;
+  highlightBrand: string | null;
+}) {
+  const accent = getModelAccent(modelResult.model);
+
+  if (modelResult.status === "error") {
+    return (
+      <article
+        className={`overflow-hidden rounded-r-lg border border-base-300 border-l-4 ${accent.border} bg-base-100`}
+      >
+        <ModelHeader
+          model={modelResult.model}
+          modelName={null}
+          tokens={null}
+          webSearch={false}
+          brandMentioned={null}
+          highlightBrand={null}
+          status="error"
+        />
+        <div className="flex items-start gap-2 px-5 py-4 text-sm text-error">
+          <AlertCircle className="mt-0.5 size-4 shrink-0" />
+          <span>{modelResult.message}</span>
+        </div>
+      </article>
+    );
+  }
+
+  return (
+    <article
+      className={`overflow-hidden rounded-r-lg border border-base-300 border-l-4 ${accent.border} bg-base-100`}
+    >
+      <ModelHeader
+        model={modelResult.model}
+        modelName={modelResult.modelName}
+        tokens={modelResult.outputTokens}
+        webSearch={modelResult.webSearch}
+        brandMentioned={modelResult.brandMentioned}
+        highlightBrand={highlightBrand}
+        status="success"
+      />
+
+      <div className="px-5 py-5">
+        <MarkdownAnswer text={modelResult.text} />
+      </div>
+
+      {modelResult.citations.length > 0 ? (
+        <div className="border-t border-base-200 bg-base-200/30 px-5 py-3">
+          <p className="mb-2 text-xs font-medium uppercase tracking-wider text-base-content/50">
+            Cited sources ({modelResult.citations.length})
+          </p>
+          <ul className="space-y-1.5">
+            {modelResult.citations.map((citation, index) => (
+              <li
+                key={`${citation.url}-${index}`}
+                className="flex items-start gap-2 text-sm"
+              >
+                <span className="mt-1 size-1 shrink-0 rounded-full bg-base-content/30" />
+                <a
+                  href={citation.url}
+                  target="_blank"
+                  rel="noreferrer"
+                  className={`link inline-flex items-start gap-1 ${
+                    citation.matchedBrand ? "link-primary font-medium" : ""
+                  }`}
+                >
+                  <span className="break-all">
+                    {citation.title || formatUrlForDisplay(citation.url)}
+                  </span>
+                  <ExternalLink className="mt-1 size-3 shrink-0" />
+                </a>
+                {citation.matchedBrand && highlightBrand ? (
+                  <span className="badge badge-primary badge-xs">
+                    {highlightBrand}
+                  </span>
+                ) : null}
+              </li>
+            ))}
+          </ul>
+        </div>
+      ) : null}
+
+      {modelResult.fanOutQueries.length > 0 ? (
+        <div className="border-t border-base-200 px-5 py-3">
+          <p className="mb-2 text-xs font-medium uppercase tracking-wider text-base-content/50">
+            Related queries the model considered
+          </p>
+          <div className="flex flex-wrap gap-1.5">
+            {modelResult.fanOutQueries.map((query, index) => (
+              <span
+                key={`${query}-${index}`}
+                className="rounded-full border border-base-300 px-2.5 py-0.5 text-xs text-base-content/70"
+              >
+                {query}
+              </span>
+            ))}
+          </div>
+        </div>
+      ) : null}
+    </article>
+  );
+}
+
+function ModelHeader({
+  model,
+  modelName,
+  tokens,
+  webSearch,
+  brandMentioned,
+  highlightBrand,
+  status,
+}: {
+  model: PromptExplorerModelResult["model"];
+  modelName: string | null;
+  tokens: number | null;
+  webSearch: boolean;
+  brandMentioned: boolean | null;
+  highlightBrand: string | null;
+  status: "success" | "error";
+}) {
+  const accent = getModelAccent(model);
+  return (
+    <header className="flex flex-wrap items-center justify-between gap-2 border-b border-base-200 bg-base-200/40 px-5 py-3">
+      <div className="flex flex-wrap items-center gap-2">
+        <span className={`size-2 rounded-full ${accent.dot}`} />
+        <h3 className="text-sm font-semibold">{formatModelLabel(model)}</h3>
+        {modelName ? (
+          <code className="text-xs text-base-content/50">{modelName}</code>
+        ) : null}
+        {status === "error" ? (
+          <span className="badge badge-error badge-sm">Error</span>
+        ) : null}
+        <BrandMentionBadge
+          mentioned={brandMentioned}
+          highlightBrand={highlightBrand}
+        />
+        {webSearch ? (
+          <span className="inline-flex items-center gap-1 text-xs text-base-content/60">
+            <Globe className="size-3" />
+            web search
+          </span>
+        ) : null}
+      </div>
+      {tokens != null ? (
+        <span className="text-xs tabular-nums text-base-content/50">
+          {tokens.toLocaleString()} tokens
+        </span>
+      ) : null}
+    </header>
+  );
+}
+
+function BrandMentionBadge({
+  mentioned,
+  highlightBrand,
+}: {
+  mentioned: boolean | null;
+  highlightBrand: string | null;
+}) {
+  if (mentioned == null || !highlightBrand) return null;
+  if (mentioned) {
+    return (
+      <span className="inline-flex items-center gap-1 rounded-full bg-success/15 px-2 py-0.5 text-xs font-medium text-success">
+        <CheckCircle2 className="size-3" />
+        {highlightBrand}
+      </span>
+    );
+  }
+  return (
+    <span className="inline-flex items-center gap-1 rounded-full bg-base-200 px-2 py-0.5 text-xs text-base-content/60">
+      <XCircle className="size-3" />
+      no {highlightBrand}
+    </span>
+  );
+}

src/client/features/ai-search/components/SearchHistorySection.tsx

@@ -0,0 +1,94 @@
+import type { ComponentType, ReactNode } from "react";
+import { Clock, History, X } from "lucide-react";
+
+type Props<TItem extends { timestamp: number }> = {
+  history: TItem[];
+  historyLoaded: boolean;
+  onRemoveHistoryItem: (timestamp: number) => void;
+  onSelectHistoryItem: (item: TItem) => void;
+  /** Icon component rendered in the empty state (e.g. Sparkles, MessageSquare). */
+  emptyIcon: ComponentType<{ className?: string }>;
+  /** Empty-state headline copy. */
+  emptyMessage: string;
+  /**
+   * Label noun used in the "{n} recent {noun}(s)" header (e.g. "lookup",
+   * "prompt"). Pluralization is handled by the component.
+   */
+  noun: string;
+  /** Item body — primary (and optional secondary) text shown in each row. */
+  renderItem: (item: TItem) => ReactNode;
+};
+
+export function SearchHistorySection<TItem extends { timestamp: number }>({
+  history,
+  historyLoaded,
+  onRemoveHistoryItem,
+  onSelectHistoryItem,
+  emptyIcon: EmptyIcon,
+  emptyMessage,
+  noun,
+  renderItem,
+}: Props<TItem>) {
+  if (!historyLoaded) {
+    return null;
+  }
+
+  if (history.length === 0) {
+    return (
+      <section className="rounded-2xl border border-dashed border-base-300 bg-base-100/70 p-6 text-center text-base-content/55 space-y-2">
+        <EmptyIcon className="size-9 mx-auto opacity-35" />
+        <p className="text-base font-medium text-base-content/80">
+          {emptyMessage}
+        </p>
+      </section>
+    );
+  }
+
+  return (
+    <section className="rounded-2xl border border-base-300 bg-base-100 p-5 md:p-6">
+      <div className="flex items-center justify-between mb-4">
+        <div className="flex items-center gap-2">
+          <History className="size-4 text-base-content/45" />
+          <span className="text-sm text-base-content/60">
+            {history.length} recent {noun}
+            {history.length !== 1 ? "s" : ""}
+          </span>
+        </div>
+      </div>
+
+      <div className="grid gap-2">
+        {history.map((item) => (
+          <div
+            key={item.timestamp}
+            className="group flex items-center gap-2 rounded-lg border border-base-300 bg-base-100 p-2"
+          >
+            <button
+              type="button"
+              className="flex min-w-0 flex-1 items-center gap-3 rounded-md px-1 py-1 text-left transition-colors hover:bg-base-200"
+              onClick={() => onSelectHistoryItem(item)}
+            >
+              <Clock className="size-4 text-base-content/40 shrink-0" />
+              <div className="min-w-0">{renderItem(item)}</div>
+            </button>
+            <div className="flex items-center gap-2 shrink-0">
+              <span className="text-xs text-base-content/40">
+                {new Date(item.timestamp).toLocaleDateString(undefined, {
+                  month: "short",
+                  day: "numeric",
+                })}
+              </span>
+              <button
+                type="button"
+                className="btn btn-ghost btn-xs opacity-0 group-hover:opacity-100 p-1"
+                onClick={() => onRemoveHistoryItem(item.timestamp)}
+                aria-label="Remove from history"
+              >
+                <X className="size-3" />
+              </button>
+            </div>
+          </div>
+        ))}
+      </div>
+    </section>
+  );
+}

src/client/features/ai-search/platformLabels.ts

@@ -0,0 +1,96 @@
+import type {
+  PromptExplorerModel,
+  WebSearchCountryCode,
+} from "@/types/schemas/ai-search";
+
+const MENTION_PLATFORM_LABELS: Record<"chat_gpt" | "google", string> = {
+  chat_gpt: "ChatGPT",
+  google: "Google AI Overview",
+};
+
+const MODEL_LABELS: Record<PromptExplorerModel, string> = {
+  chat_gpt: "ChatGPT",
+  claude: "Claude",
+  gemini: "Gemini",
+  perplexity: "Perplexity",
+};
+
+/**
+ * Per-model accent colors. Applied as left-border + dot on response cards so
+ * the model header is unambiguously separated from the markdown content that
+ * follows. Values are Tailwind color tokens that work in light + dark themes.
+ */
+type ModelAccent = {
+  border: string;
+  dot: string;
+};
+
+const MODEL_ACCENTS: Record<PromptExplorerModel, ModelAccent> = {
+  chat_gpt: {
+    border: "border-l-emerald-500",
+    dot: "bg-emerald-500",
+  },
+  claude: {
+    border: "border-l-orange-500",
+    dot: "bg-orange-500",
+  },
+  gemini: {
+    border: "border-l-sky-500",
+    dot: "bg-sky-500",
+  },
+  perplexity: {
+    border: "border-l-violet-500",
+    dot: "bg-violet-500",
+  },
+};
+
+export function formatPlatformLabel(platform: "chat_gpt" | "google"): string {
+  return MENTION_PLATFORM_LABELS[platform];
+}
+
+export function formatModelLabel(model: PromptExplorerModel): string {
+  return MODEL_LABELS[model];
+}
+
+export function getModelAccent(model: PromptExplorerModel): ModelAccent {
+  return MODEL_ACCENTS[model];
+}
+
+const COUNTRY_LABELS: Record<WebSearchCountryCode, string> = {
+  US: "United States",
+  GB: "United Kingdom",
+  CA: "Canada",
+  AU: "Australia",
+  IE: "Ireland",
+  DE: "Germany",
+  FR: "France",
+  ES: "Spain",
+  IT: "Italy",
+  NL: "Netherlands",
+  PT: "Portugal",
+  PL: "Poland",
+  SE: "Sweden",
+  NO: "Norway",
+  DK: "Denmark",
+  BR: "Brazil",
+  MX: "Mexico",
+  IN: "India",
+  JP: "Japan",
+  KR: "South Korea",
+  SG: "Singapore",
+  HK: "Hong Kong",
+  TW: "Taiwan",
+  ZA: "South Africa",
+};
+
+export function formatCountryLabel(code: WebSearchCountryCode): string {
+  return COUNTRY_LABELS[code];
+}
+
+const NUMBER_FORMATTER = new Intl.NumberFormat("en-US");
+
+/** Render a count for display. Null/undefined renders as an em-dash. */
+export function formatCount(value: number | null | undefined): string {
+  if (value == null) return "—";
+  return NUMBER_FORMATTER.format(value);
+}

src/client/features/ai-search/urlDisplay.ts

@@ -0,0 +1,24 @@
+/**
+ * Prettify a URL for display: drop Chrome scroll-to-text fragments (`#:~:`)
+ * and decode percent-encoding so `%20` becomes a space. Google AI Overview
+ * citations routinely carry 200-char text fragments that are useful in the
+ * href (they scroll the browser to the cited passage) but pure visual noise
+ * as link text.
+ *
+ * The original URL is still what gets navigated to — only the visible text
+ * changes. Falls back to the raw input if parsing fails.
+ */
+export function formatUrlForDisplay(value: string): string {
+  try {
+    const url = new URL(value);
+    const hash = url.hash.startsWith("#:~:") ? "" : url.hash;
+    const cleaned = `${url.protocol}//${url.host}${url.pathname}${url.search}${hash}`;
+    try {
+      return decodeURI(cleaned);
+    } catch {
+      return cleaned;
+    }
+  } catch {
+    return value;
+  }
+}

src/client/features/ai-search/useBrandLookupFilters.ts

@@ -0,0 +1,94 @@
+import { useCallback, useEffect, useState } from "react";
+import { useForm, useStore } from "@tanstack/react-form";
+import {
+  EMPTY_QUERIES_FILTERS,
+  EMPTY_TOP_PAGES_FILTERS,
+  type QueriesFilterValues,
+  type TopPagesFilterValues,
+} from "./brandLookupFilterTypes";
+import { countActiveFilters } from "./brandLookupFiltering";
+
+const STORAGE_KEY_PREFIX = "brand-lookup-filters:";
+
+type FilterValues = Record<string, string>;
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+function loadFromStorage<T extends FilterValues>(tab: string, fallback: T): T {
+  const fallbackClone = { ...fallback };
+
+  try {
+    const raw = localStorage.getItem(`${STORAGE_KEY_PREFIX}${tab}`);
+    if (!raw) return fallbackClone;
+
+    const parsed: unknown = JSON.parse(raw);
+    if (!isRecord(parsed)) return fallbackClone;
+
+    const result = { ...fallbackClone };
+    for (const key in fallback) {
+      const value = parsed[key];
+      if (typeof value === "string") {
+        Object.assign(result, { [key]: value });
+      }
+    }
+
+    return result;
+  } catch {
+    return fallbackClone;
+  }
+}
+
+function saveToStorage(tab: string, values: FilterValues) {
+  try {
+    localStorage.setItem(`${STORAGE_KEY_PREFIX}${tab}`, JSON.stringify(values));
+  } catch {
+    // storage full - silently ignore
+  }
+}
+
+function useTabFilters<T extends FilterValues>(tab: string, emptyValues: T) {
+  const [defaultValues] = useState<T>(() =>
+    loadFromStorage(tab, { ...emptyValues }),
+  );
+  const form = useForm({ defaultValues });
+  const values = useStore(form.store, (state) => state.values);
+
+  useEffect(() => {
+    saveToStorage(tab, values);
+  }, [tab, values]);
+
+  const reset = useCallback(() => {
+    form.reset({ ...emptyValues }, { keepDefaultValues: true });
+  }, [emptyValues, form]);
+
+  return {
+    form,
+    values,
+    reset,
+    activeFilterCount: countActiveFilters(values),
+  };
+}
+
+export function useBrandLookupFilters() {
+  const [showFilters, setShowFilters] = useState(false);
+
+  const pages = useTabFilters<TopPagesFilterValues>(
+    "pages",
+    EMPTY_TOP_PAGES_FILTERS,
+  );
+  const queries = useTabFilters<QueriesFilterValues>(
+    "queries",
+    EMPTY_QUERIES_FILTERS,
+  );
+
+  return {
+    pages,
+    queries,
+    showFilters,
+    setShowFilters,
+  };
+}
+
+export type BrandLookupFiltersState = ReturnType<typeof useBrandLookupFilters>;

src/client/features/backlinks/BacklinksTableColumns.tsx

@@ -1,5 +1,11 @@
 import type { ColumnDef } from "@tanstack/react-table";
-import { ArrowDown, ArrowUp, ChevronRight } from "lucide-react";
+import { ChevronRight } from "lucide-react";
+import { SortableHeader } from "@/client/components/table/SortableHeader";
+import {
+  dateNullsLast,
+  numericNullsLast,
+  stringNullsLast,
+} from "@/client/components/table/nullSafeSort";
 import { HeaderHelpLabel } from "@/client/features/keywords/components";
 import { BacklinksSourceLink } from "./BacklinksPageLinks";
 import type { BacklinksRow, GroupedBacklinkDomain } from "./backlinksPageTypes";
@@ -65,45 +71,6 @@ function DomainFlagBadges({ group }: { group: GroupedBacklinkDomain }) {
   );
 }
 
-function SortableHeader({
-  column,
-  label,
-  helpText,
-  align,
-}: {
-  column: {
-    getIsSorted: () => false | "asc" | "desc";
-    getToggleSortingHandler: () => ((event: unknown) => void) | undefined;
-  };
-  label: string;
-  helpText: string;
-  align?: "left" | "right";
-}) {
-  const sorted = column.getIsSorted();
-  const content = (
-    <button
-      type="button"
-      className="inline-flex items-center gap-1 font-medium transition-colors hover:text-base-content"
-      onClick={column.getToggleSortingHandler()}
-      aria-label={`Sort by ${label}`}
-      aria-pressed={!!sorted}
-    >
-      <HeaderHelpLabel label={label} helpText={helpText} />
-      {sorted === "asc" ? (
-        <ArrowUp className="size-3 shrink-0" />
-      ) : sorted === "desc" ? (
-        <ArrowDown className="size-3 shrink-0" />
-      ) : null}
-    </button>
-  );
-
-  if (align === "right") {
-    return <span className="flex w-full justify-end">{content}</span>;
-  }
-
-  return content;
-}
-
 export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
   {
     id: "source",
@@ -148,7 +115,7 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
         </div>
       );
     },
-    sortingFn: "alphanumeric",
+    sortingFn: stringNullsLast,
   },
   {
     id: "target",
@@ -157,7 +124,6 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
     ),
     size: 220,
     minSize: 150,
-    accessorFn: (row) => row.targetCount,
     enableSorting: false,
     cell: ({ row }) => {
       if (row.depth > 0) {
@@ -175,20 +141,15 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
 
       return null;
     },
-    sortingFn: "basic",
   },
   {
     id: "anchor",
-    header: ({ column }) => (
-      <SortableHeader
-        column={column}
-        label="Anchor"
-        helpText="Text or format of the link"
-      />
+    header: () => (
+      <HeaderHelpLabel label="Anchor" helpText="Text or format of the link" />
     ),
     size: 150,
     minSize: 100,
-    accessorFn: (row) => row._backlink?.anchor ?? row.domain,
+    enableSorting: false,
     cell: ({ row }) => {
       if (row.depth > 0) {
         const child = row.original._backlink;
@@ -206,8 +167,6 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
 
       return null;
     },
-    sortingFn: "alphanumeric",
-    enableSorting: false,
   },
   {
     id: "flags",
@@ -236,17 +195,17 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
   },
   {
     id: "linkAuthority",
-    header: ({ column }) => (
-      <SortableHeader
-        column={column}
-        label="Link"
-        helpText="Authority of the linking page"
-        align="right"
-      />
+    header: () => (
+      <span className="flex w-full justify-end">
+        <HeaderHelpLabel
+          label="Link"
+          helpText="Authority of the linking page"
+        />
+      </span>
     ),
     size: 70,
     minSize: 50,
-    accessorFn: (row) => row._backlink?.rank ?? null,
+    enableSorting: false,
     cell: ({ row }) => {
       if (row.depth > 0) {
         const child = row.original._backlink;
@@ -267,8 +226,6 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
 
       return null;
     },
-    sortingFn: "basic",
-    enableSorting: false,
   },
   {
     id: "domainAuthority",
@@ -292,7 +249,8 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
         </div>
       );
     },
-    sortingFn: "basic",
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
   },
   {
     id: "spamScore",
@@ -319,7 +277,8 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
         </div>
       );
     },
-    sortingFn: "basic",
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
   },
   {
     id: "firstSeen",
@@ -354,6 +313,7 @@ export const backlinksColumns: ColumnDef<GroupedBacklinkDomain>[] = [
         </div>
       );
     },
-    sortingFn: "datetime",
+    sortingFn: dateNullsLast,
+    sortDescFirst: true,
   },
 ];

src/client/features/backlinks/BacklinksTableHeaders.tsx

@@ -1,182 +0,0 @@
-import { ArrowDown, ArrowUp } from "lucide-react";
-import { HeaderHelpLabel } from "@/client/features/keywords/components";
-import {
-  getNextSort,
-  type ReferringDomainsTableSort,
-  type SortDirection,
-  type TopPagesTableSort,
-} from "./backlinksTableSorting";
-
-export function ReferringDomainsTableHeader({
-  sort,
-  onSortChange,
-}: {
-  sort: ReferringDomainsTableSort;
-  onSortChange: (sort: ReferringDomainsTableSort) => void;
-}) {
-  return (
-    <thead>
-      <tr>
-        <SortableHeaderCell
-          label="Domain"
-          helpText="The referring site linking to your target."
-          field="domain"
-          defaultDirection="asc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Backlinks"
-          helpText="Total backlinks found from this domain."
-          field="backlinks"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Referring Pages"
-          helpText="Unique pages on this domain that link to your target."
-          field="referringPages"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Rank"
-          helpText="Authority score for the referring domain."
-          field="rank"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Spam"
-          helpText="Spam risk score for this referring domain."
-          field="spamScore"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="First Seen"
-          helpText="When this domain was first discovered linking to your target."
-          field="firstSeen"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Issues"
-          helpText="Broken link and broken page counts tied to this domain."
-          field="issues"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-      </tr>
-    </thead>
-  );
-}
-
-export function TopPagesTableHeader({
-  sort,
-  onSortChange,
-}: {
-  sort: TopPagesTableSort;
-  onSortChange: (sort: TopPagesTableSort) => void;
-}) {
-  return (
-    <thead>
-      <tr>
-        <SortableHeaderCell
-          label="Page"
-          helpText="Page on the target site receiving backlinks."
-          field="page"
-          defaultDirection="asc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Backlinks"
-          helpText="Total backlinks pointing to this page."
-          field="backlinks"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Referring Domains"
-          helpText="Unique domains linking to this page."
-          field="referringDomains"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Rank"
-          helpText="Authority score for this target page."
-          field="rank"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-        <SortableHeaderCell
-          label="Broken Backlinks"
-          helpText="Backlinks pointing here that are currently broken."
-          field="brokenBacklinks"
-          defaultDirection="desc"
-          sort={sort}
-          onSortChange={onSortChange}
-        />
-      </tr>
-    </thead>
-  );
-}
-
-function SortableHeaderCell<TField extends string>({
-  align,
-  label,
-  helpText,
-  field,
-  defaultDirection,
-  sort,
-  onSortChange,
-}: {
-  align?: "left" | "right";
-  label: string;
-  helpText: string;
-  field: TField;
-  defaultDirection: SortDirection;
-  sort: { field: TField; direction: SortDirection };
-  onSortChange: (sort: { field: TField; direction: SortDirection }) => void;
-}) {
-  const isActive = sort.field === field;
-  const content = (
-    <button
-      type="button"
-      className="inline-flex items-center gap-1 font-medium transition-colors hover:text-base-content"
-      onClick={() => onSortChange(getNextSort(sort, field, defaultDirection))}
-      aria-label={`Sort by ${label}`}
-      aria-pressed={isActive}
-    >
-      <HeaderHelpLabel label={label} helpText={helpText} />
-      {isActive ? (
-        sort.direction === "asc" ? (
-          <ArrowUp className="size-3 shrink-0" />
-        ) : (
-          <ArrowDown className="size-3 shrink-0" />
-        )
-      ) : null}
-    </button>
-  );
-
-  return (
-    <th className={align === "right" ? "text-right" : undefined}>
-      {align === "right" ? (
-        <span className="inline-flex justify-end">{content}</span>
-      ) : (
-        content
-      )}
-    </th>
-  );
-}

src/client/features/backlinks/ReferringDomainsTable.tsx

@@ -1,27 +1,163 @@
-import { useMemo, useState } from "react";
-import { EmptyTableState } from "./BacklinksPageEmptyTableState";
-import { ReferringDomainsTableHeader } from "./BacklinksTableHeaders";
-import type { BacklinksOverviewData } from "./backlinksPageTypes";
 import {
-  DEFAULT_REFERRING_DOMAINS_SORT,
-  sortReferringDomainRows,
-} from "./backlinksTableSorting";
+  createColumnHelper,
+  flexRender,
+  getCoreRowModel,
+  getSortedRowModel,
+  useReactTable,
+  type SortingFn,
+  type SortingState,
+} from "@tanstack/react-table";
+import { useState } from "react";
+import { SortableHeader } from "@/client/components/table/SortableHeader";
+import {
+  compareNumericNullsLast,
+  dateNullsLast,
+  isDescending,
+  numericNullsLast,
+  stringNullsLast,
+} from "@/client/components/table/nullSafeSort";
+import { EmptyTableState } from "./BacklinksPageEmptyTableState";
+import type { BacklinksOverviewData } from "./backlinksPageTypes";
 import {
   formatCompactDate,
   formatDecimal,
   formatNumber,
 } from "./backlinksPageUtils";
 
+type ReferringDomainRow = BacklinksOverviewData["referringDomains"][number];
+
+const columnHelper = createColumnHelper<ReferringDomainRow>();
+
+// Nulls always to the bottom in both directions, same as the pre-TanStack
+// implementation. Secondary compare on brokenPages must also keep nulls last —
+// coercing to 0 would mix unknown values with real zeroes.
+const sortByIssues: SortingFn<ReferringDomainRow> = (left, right, columnId) => {
+  const descending = isDescending(left, columnId);
+  const primary = compareNumericNullsLast(
+    left.original.brokenBacklinks,
+    right.original.brokenBacklinks,
+    descending,
+  );
+  if (primary !== 0) return primary;
+  return compareNumericNullsLast(
+    left.original.brokenPages,
+    right.original.brokenPages,
+    descending,
+  );
+};
+
+const columns = [
+  columnHelper.accessor("domain", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Domain"
+        helpText="The referring site linking to your target."
+      />
+    ),
+    cell: ({ getValue }) => getValue() ?? "-",
+    sortingFn: stringNullsLast,
+  }),
+  columnHelper.accessor("backlinks", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Backlinks"
+        helpText="Total backlinks found from this domain."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("referringPages", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Referring Pages"
+        helpText="Unique pages on this domain that link to your target."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("rank", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Rank"
+        helpText="Authority score for the referring domain."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("spamScore", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Spam"
+        helpText="Spam risk score for this referring domain."
+      />
+    ),
+    cell: ({ getValue }) => formatDecimal(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("firstSeen", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="First Seen"
+        helpText="When this domain was first discovered linking to your target."
+      />
+    ),
+    cell: ({ getValue }) => formatCompactDate(getValue()),
+    sortingFn: dateNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.display({
+    id: "issues",
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Issues"
+        helpText="Broken link and broken page counts tied to this domain."
+      />
+    ),
+    cell: ({ row }) => (
+      <div className="text-sm">
+        <div>Broken links: {formatNumber(row.original.brokenBacklinks)}</div>
+        <div className="text-base-content/55">
+          Broken pages: {formatNumber(row.original.brokenPages)}
+        </div>
+      </div>
+    ),
+    enableSorting: true,
+    sortingFn: sortByIssues,
+    sortDescFirst: true,
+  }),
+];
+
+const DEFAULT_SORTING: SortingState = [{ id: "backlinks", desc: true }];
+
 export function ReferringDomainsTable({
   rows,
 }: {
   rows: BacklinksOverviewData["referringDomains"];
 }) {
-  const [sort, setSort] = useState(DEFAULT_REFERRING_DOMAINS_SORT);
-  const sortedRows = useMemo(
-    () => sortReferringDomainRows(rows, sort),
-    [rows, sort],
-  );
+  const [sorting, setSorting] = useState<SortingState>(DEFAULT_SORTING);
+
+  const table = useReactTable({
+    data: rows,
+    columns,
+    state: { sorting },
+    onSortingChange: setSorting,
+    getCoreRowModel: getCoreRowModel(),
+    getSortedRowModel: getSortedRowModel(),
+  });
 
   if (rows.length === 0) {
     return <EmptyTableState label="No referring domains match this filter." />;
@@ -30,24 +166,37 @@ export function ReferringDomainsTable({
   return (
     <div className="overflow-x-auto">
       <table className="table table-sm">
-        <ReferringDomainsTableHeader sort={sort} onSortChange={setSort} />
+        <thead>
+          {table.getHeaderGroups().map((headerGroup) => (
+            <tr key={headerGroup.id}>
+              {headerGroup.headers.map((header) => (
+                <th key={header.id}>
+                  {header.isPlaceholder
+                    ? null
+                    : flexRender(
+                        header.column.columnDef.header,
+                        header.getContext(),
+                      )}
+                </th>
+              ))}
+            </tr>
+          ))}
+        </thead>
         <tbody>
-          {sortedRows.map((row, index) => (
-            <tr key={`${row.domain ?? "domain"}-${index}`}>
-              <td className="font-medium break-all">{row.domain ?? "-"}</td>
-              <td>{formatNumber(row.backlinks)}</td>
-              <td>{formatNumber(row.referringPages)}</td>
-              <td>{formatNumber(row.rank)}</td>
-              <td>{formatDecimal(row.spamScore)}</td>
-              <td>{formatCompactDate(row.firstSeen)}</td>
-              <td>
-                <div className="text-sm">
-                  <div>Broken links: {formatNumber(row.brokenBacklinks)}</div>
-                  <div className="text-base-content/55">
-                    Broken pages: {formatNumber(row.brokenPages)}
-                  </div>
-                </div>
-              </td>
+          {table.getRowModel().rows.map((row) => (
+            <tr key={row.id}>
+              {row.getVisibleCells().map((cell) => (
+                <td
+                  key={cell.id}
+                  className={
+                    cell.column.id === "domain"
+                      ? "font-medium break-all"
+                      : undefined
+                  }
+                >
+                  {flexRender(cell.column.columnDef.cell, cell.getContext())}
+                </td>
+              ))}
             </tr>
           ))}
         </tbody>

src/client/features/backlinks/TopPagesTable.tsx

@@ -1,21 +1,116 @@
-import { useMemo, useState } from "react";
+import {
+  createColumnHelper,
+  flexRender,
+  getCoreRowModel,
+  getSortedRowModel,
+  useReactTable,
+  type SortingState,
+} from "@tanstack/react-table";
+import { useState } from "react";
+import { SortableHeader } from "@/client/components/table/SortableHeader";
+import {
+  numericNullsLast,
+  stringNullsLast,
+} from "@/client/components/table/nullSafeSort";
 import { EmptyTableState } from "./BacklinksPageEmptyTableState";
 import { BacklinksExternalLink } from "./BacklinksPageLinks";
-import { TopPagesTableHeader } from "./BacklinksTableHeaders";
 import type { BacklinksOverviewData } from "./backlinksPageTypes";
-import {
-  DEFAULT_TOP_PAGES_SORT,
-  sortTopPageRows,
-} from "./backlinksTableSorting";
 import { formatNumber } from "./backlinksPageUtils";
 
+type TopPageRow = BacklinksOverviewData["topPages"][number];
+
+const columnHelper = createColumnHelper<TopPageRow>();
+
+const columns = [
+  columnHelper.accessor("page", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Page"
+        helpText="Page on the target site receiving backlinks."
+      />
+    ),
+    cell: ({ getValue }) => {
+      const page = getValue();
+      return page ? (
+        <BacklinksExternalLink
+          url={page}
+          label={page}
+          className="link link-hover break-all inline-flex items-center gap-1"
+        />
+      ) : (
+        "-"
+      );
+    },
+    sortingFn: stringNullsLast,
+  }),
+  columnHelper.accessor("backlinks", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Backlinks"
+        helpText="Total backlinks pointing to this page."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("referringDomains", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Referring Domains"
+        helpText="Unique domains linking to this page."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("rank", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Rank"
+        helpText="Authority score for this target page."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+  columnHelper.accessor("brokenBacklinks", {
+    header: ({ column }) => (
+      <SortableHeader
+        column={column}
+        label="Broken Backlinks"
+        helpText="Backlinks pointing here that are currently broken."
+      />
+    ),
+    cell: ({ getValue }) => formatNumber(getValue()),
+    sortingFn: numericNullsLast,
+    sortDescFirst: true,
+  }),
+];
+
+const DEFAULT_SORTING: SortingState = [{ id: "backlinks", desc: true }];
+
 export function TopPagesTable({
   rows,
 }: {
   rows: BacklinksOverviewData["topPages"];
 }) {
-  const [sort, setSort] = useState(DEFAULT_TOP_PAGES_SORT);
-  const sortedRows = useMemo(() => sortTopPageRows(rows, sort), [rows, sort]);
+  const [sorting, setSorting] = useState<SortingState>(DEFAULT_SORTING);
+
+  const table = useReactTable({
+    data: rows,
+    columns,
+    state: { sorting },
+    onSortingChange: setSorting,
+    getCoreRowModel: getCoreRowModel(),
+    getSortedRowModel: getSortedRowModel(),
+  });
 
   if (rows.length === 0) {
     return <EmptyTableState label="No top pages match this filter." />;
@@ -24,25 +119,33 @@ export function TopPagesTable({
   return (
     <div className="overflow-x-auto">
       <table className="table table-sm">
-        <TopPagesTableHeader sort={sort} onSortChange={setSort} />
+        <thead>
+          {table.getHeaderGroups().map((headerGroup) => (
+            <tr key={headerGroup.id}>
+              {headerGroup.headers.map((header) => (
+                <th key={header.id}>
+                  {header.isPlaceholder
+                    ? null
+                    : flexRender(
+                        header.column.columnDef.header,
+                        header.getContext(),
+                      )}
+                </th>
+              ))}
+            </tr>
+          ))}
+        </thead>
         <tbody>
-          {sortedRows.map((row, index) => (
-            <tr key={`${row.page ?? "page"}-${index}`}>
-              <td className="min-w-80">
-                {row.page ? (
-                  <BacklinksExternalLink
-                    url={row.page}
-                    label={row.page}
-                    className="link link-hover break-all inline-flex items-center gap-1"
-                  />
-                ) : (
-                  "-"
-                )}
-              </td>
-              <td>{formatNumber(row.backlinks)}</td>
-              <td>{formatNumber(row.referringDomains)}</td>
-              <td>{formatNumber(row.rank)}</td>
-              <td>{formatNumber(row.brokenBacklinks)}</td>
+          {table.getRowModel().rows.map((row) => (
+            <tr key={row.id}>
+              {row.getVisibleCells().map((cell) => (
+                <td
+                  key={cell.id}
+                  className={cell.column.id === "page" ? "min-w-80" : undefined}
+                >
+                  {flexRender(cell.column.columnDef.cell, cell.getContext())}
+                </td>
+              ))}
             </tr>
           ))}
         </tbody>

src/client/features/backlinks/backlinksFiltering.ts

@@ -12,8 +12,10 @@ function passesNumericFilter(
   max: string,
 ): boolean {
   if (value == null) return true;
-  if (min && value < Number(min)) return false;
-  if (max && value > Number(max)) return false;
+  const minN = Number(min);
+  if (min && !Number.isNaN(minN) && value < minN) return false;
+  const maxN = Number(max);
+  if (max && !Number.isNaN(maxN) && value > maxN) return false;
   return true;
 }
 

src/client/features/backlinks/backlinksTableSorting.ts

@@ -1,167 +0,0 @@
-import type { BacklinksOverviewData } from "./backlinksPageTypes";
-
-export type SortDirection = "asc" | "desc";
-
-export type ReferringDomainsTableSortField =
-  | "domain"
-  | "backlinks"
-  | "referringPages"
-  | "rank"
-  | "spamScore"
-  | "firstSeen"
-  | "issues";
-
-export type TopPagesTableSortField =
-  | "page"
-  | "backlinks"
-  | "referringDomains"
-  | "rank"
-  | "brokenBacklinks";
-
-export type TableSort<TField extends string> = {
-  field: TField;
-  direction: SortDirection;
-};
-
-export type ReferringDomainsTableSort =
-  TableSort<ReferringDomainsTableSortField>;
-export type TopPagesTableSort = TableSort<TopPagesTableSortField>;
-
-export const DEFAULT_REFERRING_DOMAINS_SORT: ReferringDomainsTableSort = {
-  field: "backlinks",
-  direction: "desc",
-};
-
-export const DEFAULT_TOP_PAGES_SORT: TopPagesTableSort = {
-  field: "backlinks",
-  direction: "desc",
-};
-
-export function getNextSort<TField extends string>(
-  current: TableSort<TField>,
-  field: TField,
-  defaultDirection: SortDirection,
-): TableSort<TField> {
-  if (current.field !== field) {
-    return { field, direction: defaultDirection };
-  }
-
-  return {
-    field,
-    direction: current.direction === "asc" ? "desc" : "asc",
-  };
-}
-
-export function sortReferringDomainRows(
-  rows: BacklinksOverviewData["referringDomains"],
-  sort: ReferringDomainsTableSort,
-) {
-  return rows.toSorted((left, right) => {
-    switch (sort.field) {
-      case "domain":
-        return compareStrings(left.domain, right.domain, sort.direction);
-      case "backlinks":
-        return compareNumbers(left.backlinks, right.backlinks, sort.direction);
-      case "referringPages":
-        return compareNumbers(
-          left.referringPages,
-          right.referringPages,
-          sort.direction,
-        );
-      case "rank":
-        return compareNumbers(left.rank, right.rank, sort.direction);
-      case "spamScore":
-        return compareNumbers(left.spamScore, right.spamScore, sort.direction);
-      case "firstSeen":
-        return compareDates(left.firstSeen, right.firstSeen, sort.direction);
-      case "issues":
-        return compareIssues(left, right, sort.direction);
-      default:
-        return 0;
-    }
-  });
-}
-
-export function sortTopPageRows(
-  rows: BacklinksOverviewData["topPages"],
-  sort: TopPagesTableSort,
-) {
-  return rows.toSorted((left, right) => {
-    switch (sort.field) {
-      case "page":
-        return compareStrings(left.page, right.page, sort.direction);
-      case "backlinks":
-        return compareNumbers(left.backlinks, right.backlinks, sort.direction);
-      case "referringDomains":
-        return compareNumbers(
-          left.referringDomains,
-          right.referringDomains,
-          sort.direction,
-        );
-      case "rank":
-        return compareNumbers(left.rank, right.rank, sort.direction);
-      case "brokenBacklinks":
-        return compareNumbers(
-          left.brokenBacklinks,
-          right.brokenBacklinks,
-          sort.direction,
-        );
-      default:
-        return 0;
-    }
-  });
-}
-
-function compareNumbers(
-  left: number | null | undefined,
-  right: number | null | undefined,
-  direction: SortDirection,
-) {
-  if (left == null && right == null) return 0;
-  if (left == null) return 1;
-  if (right == null) return -1;
-  return direction === "asc" ? left - right : right - left;
-}
-
-function compareStrings(
-  left: string | null | undefined,
-  right: string | null | undefined,
-  direction: SortDirection,
-) {
-  if (!left && !right) return 0;
-  if (!left) return 1;
-  if (!right) return -1;
-  const result = left.toLowerCase().localeCompare(right.toLowerCase());
-  return direction === "asc" ? result : -result;
-}
-
-function compareDates(
-  left: string | null | undefined,
-  right: string | null | undefined,
-  direction: SortDirection,
-) {
-  if (!left && !right) return 0;
-  if (!left) return 1;
-  if (!right) return -1;
-  const leftValue = Date.parse(left);
-  const rightValue = Date.parse(right);
-  return direction === "asc" ? leftValue - rightValue : rightValue - leftValue;
-}
-
-function compareIssues(
-  left: BacklinksOverviewData["referringDomains"][number],
-  right: BacklinksOverviewData["referringDomains"][number],
-  direction: SortDirection,
-) {
-  const backlinkComparison = compareNumbers(
-    left.brokenBacklinks,
-    right.brokenBacklinks,
-    direction,
-  );
-
-  if (backlinkComparison !== 0) {
-    return backlinkComparison;
-  }
-
-  return compareNumbers(left.brokenPages, right.brokenPages, direction);
-}

src/client/features/domain/components/DomainSearchCard.tsx

@@ -25,7 +25,7 @@ export function DomainSearchCard({
     <div className="card bg-base-100 border border-base-300">
       <div className="card-body gap-4">
         <form
-          className="grid grid-cols-1 gap-3 lg:grid-cols-12"
+          className="flex flex-col gap-3 lg:flex-row lg:items-center"
           onSubmit={onSubmit}
         >
           <controlsForm.Field name="domain">
@@ -34,10 +34,11 @@ export function DomainSearchCard({
 
               return (
                 <label
-                  className={`input input-bordered lg:col-span-6 flex items-center gap-2 ${domainError ? "input-error" : ""}`}
+                  className={`input input-bordered flex flex-1 items-center gap-2 ${domainError ? "input-error" : ""}`}
                 >
                   <Search className="size-4 text-base-content/60" />
                   <input
+                    className="grow"
                     placeholder="Enter a domain (e.g. coolify.io or example.com/blog)"
                     value={field.state.value}
                     onChange={(event) => field.handleChange(event.target.value)}
@@ -54,7 +55,7 @@ export function DomainSearchCard({
           <controlsForm.Field name="locationCode">
             {(field) => (
               <select
-                className="select select-bordered lg:col-span-2"
+                className="select select-bordered shrink-0"
                 value={field.state.value}
                 onChange={(event) => {
                   const next = Number(event.target.value);
@@ -74,7 +75,7 @@ export function DomainSearchCard({
           <controlsForm.Field name="sort">
             {(field) => (
               <select
-                className="select select-bordered lg:col-span-2"
+                className="select select-bordered shrink-0"
                 value={field.state.value}
                 onChange={(event) => {
                   const next = toSortMode(event.target.value) ?? "rank";
@@ -95,7 +96,7 @@ export function DomainSearchCard({
             {(isSubmitting) => (
               <button
                 type="submit"
-                className="btn btn-primary lg:col-span-2"
+                className="btn btn-primary shrink-0 px-6"
                 disabled={isLoading || isSubmitting}
               >
                 {isLoading || isSubmitting ? "Loading..." : "Search"}

src/client/hooks/useBrandLookupSearchHistory.ts

@@ -0,0 +1,20 @@
+import { z } from "zod";
+import { useTimestampedSearchHistory } from "@/client/hooks/useTimestampedSearchHistory";
+
+const brandLookupSearchBodySchema = z.object({
+  query: z.string(),
+});
+
+type BrandLookupSearchBody = z.infer<typeof brandLookupSearchBodySchema>;
+
+export type BrandLookupSearchHistoryItem = BrandLookupSearchBody & {
+  timestamp: number;
+};
+
+export function useBrandLookupSearchHistory(projectId: string) {
+  return useTimestampedSearchHistory({
+    storageKey: `brand-lookup-search-history:${projectId}`,
+    bodySchema: brandLookupSearchBodySchema,
+    isSame: (a, b) => a.query === b.query,
+  });
+}

src/client/hooks/usePromptExplorerSearchHistory.ts

@@ -0,0 +1,48 @@
+import { z } from "zod";
+import { useTimestampedSearchHistory } from "@/client/hooks/useTimestampedSearchHistory";
+import {
+  promptExplorerModelSchema,
+  webSearchCountryCodeSchema,
+} from "@/types/schemas/ai-search";
+
+const promptExplorerSearchBodySchema = z.object({
+  prompt: z.string(),
+  highlightBrand: z.string(),
+  models: z.array(promptExplorerModelSchema),
+  webSearch: z.boolean(),
+  webSearchCountryCode: webSearchCountryCodeSchema,
+});
+
+type PromptExplorerSearchBody = z.infer<typeof promptExplorerSearchBodySchema>;
+
+export type PromptExplorerSearchHistoryItem = PromptExplorerSearchBody & {
+  timestamp: number;
+};
+
+function sameModels(a: string[], b: string[]): boolean {
+  if (a.length !== b.length) return false;
+  const sortedA = a.toSorted();
+  const sortedB = b.toSorted();
+  return sortedA.every((model, index) => model === sortedB[index]);
+}
+
+function isSameSearch(
+  a: PromptExplorerSearchBody,
+  b: PromptExplorerSearchBody,
+): boolean {
+  return (
+    a.prompt === b.prompt &&
+    a.highlightBrand === b.highlightBrand &&
+    a.webSearch === b.webSearch &&
+    a.webSearchCountryCode === b.webSearchCountryCode &&
+    sameModels(a.models, b.models)
+  );
+}
+
+export function usePromptExplorerSearchHistory(projectId: string) {
+  return useTimestampedSearchHistory({
+    storageKey: `prompt-explorer-search-history:${projectId}`,
+    bodySchema: promptExplorerSearchBodySchema,
+    isSame: isSameSearch,
+  });
+}

src/client/hooks/useTimestampedSearchHistory.ts

@@ -0,0 +1,46 @@
+import { z } from "zod";
+import { useLocalHistoryStore } from "@/client/hooks/useLocalHistoryStore";
+import { jsonCodec } from "@/shared/json";
+
+/**
+ * Shared recent-searches hook: localStorage-backed list of items tagged with
+ * `timestamp`, keyed by a per-project storage key. Each call site provides
+ * the item body's Zod schema (timestamp is added automatically) and a dedupe
+ * predicate that decides whether two searches are "the same".
+ */
+
+const timestampFieldSchema = z.object({ timestamp: z.number() });
+
+export function useTimestampedSearchHistory<TBody extends object>(args: {
+  storageKey: string;
+  bodySchema: z.ZodType<TBody>;
+  isSame: (existing: TBody, next: TBody) => boolean;
+  maxItems?: number;
+}) {
+  type StoredItem = TBody & { timestamp: number };
+  const codec = jsonCodec(
+    z.array(z.intersection(args.bodySchema, timestampFieldSchema)),
+  );
+
+  const { history, isLoaded, addItem, removeItem } = useLocalHistoryStore<
+    StoredItem,
+    TBody
+  >({
+    storageKey: args.storageKey,
+    maxItems: args.maxItems ?? 20,
+    parse: (raw) => {
+      const parsed = codec.safeParse(raw);
+      return parsed.success ? parsed.data : null;
+    },
+    isSameItem: (existing, next) => args.isSame(existing, next),
+    createItem: (input) => ({ ...input, timestamp: Date.now() }),
+    getItemKey: (item) => item.timestamp,
+  });
+
+  return {
+    history,
+    isLoaded,
+    addSearch: addItem,
+    removeHistoryItem: removeItem,
+  };
+}

src/client/layout/AppShell.tsx

@@ -205,7 +205,7 @@ function TopNav({
               );
 
               return (
-                <div key={entry.label} className="dropdown">
+                <div key={entry.label} className="dropdown dropdown-hover">
                   <button
                     type="button"
                     tabIndex={0}
@@ -221,7 +221,7 @@ function TopNav({
                   </button>
                   <ul
                     tabIndex={0}
-                    className="dropdown-content z-20 menu mt-1 w-52 rounded-box border border-base-300 bg-base-100 p-2 shadow-lg"
+                    className="dropdown-content z-20 menu w-52 rounded-box border border-base-300 bg-base-100 p-2 shadow-lg"
                   >
                     {entry.items.map((item) => {
                       const { icon: Icon, matchSegment, ...linkProps } = item;

src/client/navigation/items.ts

@@ -4,7 +4,9 @@ import {
   ClipboardCheck,
   Globe,
   Link2,
+  MessageSquare,
   Search,
+  Sparkles,
   TrendingUp,
 } from "lucide-react";
 import { linkOptions } from "@tanstack/react-router";
@@ -46,9 +48,21 @@ const projectNavItems = [
     icon: ClipboardCheck,
     matchSegment: "/audit",
   },
+  {
+    to: "/p/$projectId/brand-lookup" as const,
+    label: "Brand Lookup",
+    icon: Sparkles,
+    matchSegment: "/brand-lookup",
+  },
+  {
+    to: "/p/$projectId/prompt-explorer" as const,
+    label: "Prompt Explorer",
+    icon: MessageSquare,
+    matchSegment: "/prompt-explorer",
+  },
   {
     to: "/p/$projectId/ai" as const,
-    label: "AI",
+    label: "AI & Agents",
     icon: Bot,
     matchSegment: "/ai",
   },
@@ -91,6 +105,13 @@ export function getProjectNavGroups(projectId: string) {
         bySegment("/audit"),
       ],
     },
+    {
+      type: "group" as const,
+      label: "AI Visibility",
+      icon: Sparkles,
+      matchSegments: ["/brand-lookup", "/prompt-explorer"],
+      items: [bySegment("/brand-lookup"), bySegment("/prompt-explorer")],
+    },
     {
       type: "standalone" as const,
       item: bySegment("/ai"),

src/client/styles/app.css

@@ -108,7 +108,9 @@ select {
 
 /* Global input focus styling - use primary color instead of default ring */
 .input:focus,
-.input:focus-visible {
+.input:focus-visible,
+.textarea:focus,
+.textarea:focus-visible {
   outline: none;
   border-color: var(--color-primary);
   background-color: color-mix(in oklab, var(--color-primary) 10%, transparent);

src/routeTree.gen.ts

@@ -29,8 +29,10 @@ import { Route as ProjectPProjectIdRouteRouteImport } from './routes/_project/p/
 import { Route as ProjectPProjectIdIndexRouteImport } from './routes/_project/p/$projectId/index'
 import { Route as ProjectPProjectIdSavedRouteImport } from './routes/_project/p/$projectId/saved'
 import { Route as ProjectPProjectIdRankTrackingRouteImport } from './routes/_project/p/$projectId/rank-tracking'
+import { Route as ProjectPProjectIdPromptExplorerRouteImport } from './routes/_project/p/$projectId/prompt-explorer'
 import { Route as ProjectPProjectIdKeywordsRouteImport } from './routes/_project/p/$projectId/keywords'
 import { Route as ProjectPProjectIdDomainRouteImport } from './routes/_project/p/$projectId/domain'
+import { Route as ProjectPProjectIdBrandLookupRouteImport } from './routes/_project/p/$projectId/brand-lookup'
 import { Route as ProjectPProjectIdBacklinksRouteImport } from './routes/_project/p/$projectId/backlinks'
 import { Route as ProjectPProjectIdAuditRouteImport } from './routes/_project/p/$projectId/audit'
 import { Route as ProjectPProjectIdAiRouteImport } from './routes/_project/p/$projectId/ai'
@@ -136,6 +138,12 @@ const ProjectPProjectIdRankTrackingRoute =
     path: '/rank-tracking',
     getParentRoute: () => ProjectPProjectIdRouteRoute,
   } as any)
+const ProjectPProjectIdPromptExplorerRoute =
+  ProjectPProjectIdPromptExplorerRouteImport.update({
+    id: '/prompt-explorer',
+    path: '/prompt-explorer',
+    getParentRoute: () => ProjectPProjectIdRouteRoute,
+  } as any)
 const ProjectPProjectIdKeywordsRoute =
   ProjectPProjectIdKeywordsRouteImport.update({
     id: '/keywords',
@@ -147,6 +155,12 @@ const ProjectPProjectIdDomainRoute = ProjectPProjectIdDomainRouteImport.update({
   path: '/domain',
   getParentRoute: () => ProjectPProjectIdRouteRoute,
 } as any)
+const ProjectPProjectIdBrandLookupRoute =
+  ProjectPProjectIdBrandLookupRouteImport.update({
+    id: '/brand-lookup',
+    path: '/brand-lookup',
+    getParentRoute: () => ProjectPProjectIdRouteRoute,
+  } as any)
 const ProjectPProjectIdBacklinksRoute =
   ProjectPProjectIdBacklinksRouteImport.update({
     id: '/backlinks',
@@ -205,8 +219,10 @@ export interface FileRoutesByFullPath {
   '/p/$projectId/ai': typeof ProjectPProjectIdAiRoute
   '/p/$projectId/audit': typeof ProjectPProjectIdAuditRouteWithChildren
   '/p/$projectId/backlinks': typeof ProjectPProjectIdBacklinksRoute
+  '/p/$projectId/brand-lookup': typeof ProjectPProjectIdBrandLookupRoute
   '/p/$projectId/domain': typeof ProjectPProjectIdDomainRoute
   '/p/$projectId/keywords': typeof ProjectPProjectIdKeywordsRoute
+  '/p/$projectId/prompt-explorer': typeof ProjectPProjectIdPromptExplorerRoute
   '/p/$projectId/rank-tracking': typeof ProjectPProjectIdRankTrackingRouteWithChildren
   '/p/$projectId/saved': typeof ProjectPProjectIdSavedRoute
   '/p/$projectId/': typeof ProjectPProjectIdIndexRoute
@@ -230,8 +246,10 @@ export interface FileRoutesByTo {
   '/api/autumn/$': typeof ApiAutumnSplatRoute
   '/p/$projectId/ai': typeof ProjectPProjectIdAiRoute
   '/p/$projectId/backlinks': typeof ProjectPProjectIdBacklinksRoute
+  '/p/$projectId/brand-lookup': typeof ProjectPProjectIdBrandLookupRoute
   '/p/$projectId/domain': typeof ProjectPProjectIdDomainRoute
   '/p/$projectId/keywords': typeof ProjectPProjectIdKeywordsRoute
+  '/p/$projectId/prompt-explorer': typeof ProjectPProjectIdPromptExplorerRoute
   '/p/$projectId/saved': typeof ProjectPProjectIdSavedRoute
   '/p/$projectId': typeof ProjectPProjectIdIndexRoute
   '/p/$projectId/rank-tracking/$configId': typeof ProjectPProjectIdRankTrackingConfigIdRoute
@@ -261,8 +279,10 @@ export interface FileRoutesById {
   '/_project/p/$projectId/ai': typeof ProjectPProjectIdAiRoute
   '/_project/p/$projectId/audit': typeof ProjectPProjectIdAuditRouteWithChildren
   '/_project/p/$projectId/backlinks': typeof ProjectPProjectIdBacklinksRoute
+  '/_project/p/$projectId/brand-lookup': typeof ProjectPProjectIdBrandLookupRoute
   '/_project/p/$projectId/domain': typeof ProjectPProjectIdDomainRoute
   '/_project/p/$projectId/keywords': typeof ProjectPProjectIdKeywordsRoute
+  '/_project/p/$projectId/prompt-explorer': typeof ProjectPProjectIdPromptExplorerRoute
   '/_project/p/$projectId/rank-tracking': typeof ProjectPProjectIdRankTrackingRouteWithChildren
   '/_project/p/$projectId/saved': typeof ProjectPProjectIdSavedRoute
   '/_project/p/$projectId/': typeof ProjectPProjectIdIndexRoute
@@ -290,8 +310,10 @@ export interface FileRouteTypes {
     | '/p/$projectId/ai'
     | '/p/$projectId/audit'
     | '/p/$projectId/backlinks'
+    | '/p/$projectId/brand-lookup'
     | '/p/$projectId/domain'
     | '/p/$projectId/keywords'
+    | '/p/$projectId/prompt-explorer'
     | '/p/$projectId/rank-tracking'
     | '/p/$projectId/saved'
     | '/p/$projectId/'
@@ -315,8 +337,10 @@ export interface FileRouteTypes {
     | '/api/autumn/$'
     | '/p/$projectId/ai'
     | '/p/$projectId/backlinks'
+    | '/p/$projectId/brand-lookup'
     | '/p/$projectId/domain'
     | '/p/$projectId/keywords'
+    | '/p/$projectId/prompt-explorer'
     | '/p/$projectId/saved'
     | '/p/$projectId'
     | '/p/$projectId/rank-tracking/$configId'
@@ -345,8 +369,10 @@ export interface FileRouteTypes {
     | '/_project/p/$projectId/ai'
     | '/_project/p/$projectId/audit'
     | '/_project/p/$projectId/backlinks'
+    | '/_project/p/$projectId/brand-lookup'
     | '/_project/p/$projectId/domain'
     | '/_project/p/$projectId/keywords'
+    | '/_project/p/$projectId/prompt-explorer'
     | '/_project/p/$projectId/rank-tracking'
     | '/_project/p/$projectId/saved'
     | '/_project/p/$projectId/'
@@ -510,6 +536,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof ProjectPProjectIdRankTrackingRouteImport
       parentRoute: typeof ProjectPProjectIdRouteRoute
     }
+    '/_project/p/$projectId/prompt-explorer': {
+      id: '/_project/p/$projectId/prompt-explorer'
+      path: '/prompt-explorer'
+      fullPath: '/p/$projectId/prompt-explorer'
+      preLoaderRoute: typeof ProjectPProjectIdPromptExplorerRouteImport
+      parentRoute: typeof ProjectPProjectIdRouteRoute
+    }
     '/_project/p/$projectId/keywords': {
       id: '/_project/p/$projectId/keywords'
       path: '/keywords'
@@ -524,6 +557,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof ProjectPProjectIdDomainRouteImport
       parentRoute: typeof ProjectPProjectIdRouteRoute
     }
+    '/_project/p/$projectId/brand-lookup': {
+      id: '/_project/p/$projectId/brand-lookup'
+      path: '/brand-lookup'
+      fullPath: '/p/$projectId/brand-lookup'
+      preLoaderRoute: typeof ProjectPProjectIdBrandLookupRouteImport
+      parentRoute: typeof ProjectPProjectIdRouteRoute
+    }
     '/_project/p/$projectId/backlinks': {
       id: '/_project/p/$projectId/backlinks'
       path: '/backlinks'
@@ -633,8 +673,10 @@ interface ProjectPProjectIdRouteRouteChildren {
   ProjectPProjectIdAiRoute: typeof ProjectPProjectIdAiRoute
   ProjectPProjectIdAuditRoute: typeof ProjectPProjectIdAuditRouteWithChildren
   ProjectPProjectIdBacklinksRoute: typeof ProjectPProjectIdBacklinksRoute
+  ProjectPProjectIdBrandLookupRoute: typeof ProjectPProjectIdBrandLookupRoute
   ProjectPProjectIdDomainRoute: typeof ProjectPProjectIdDomainRoute
   ProjectPProjectIdKeywordsRoute: typeof ProjectPProjectIdKeywordsRoute
+  ProjectPProjectIdPromptExplorerRoute: typeof ProjectPProjectIdPromptExplorerRoute
   ProjectPProjectIdRankTrackingRoute: typeof ProjectPProjectIdRankTrackingRouteWithChildren
   ProjectPProjectIdSavedRoute: typeof ProjectPProjectIdSavedRoute
   ProjectPProjectIdIndexRoute: typeof ProjectPProjectIdIndexRoute
@@ -645,8 +687,10 @@ const ProjectPProjectIdRouteRouteChildren: ProjectPProjectIdRouteRouteChildren =
     ProjectPProjectIdAiRoute: ProjectPProjectIdAiRoute,
     ProjectPProjectIdAuditRoute: ProjectPProjectIdAuditRouteWithChildren,
     ProjectPProjectIdBacklinksRoute: ProjectPProjectIdBacklinksRoute,
+    ProjectPProjectIdBrandLookupRoute: ProjectPProjectIdBrandLookupRoute,
     ProjectPProjectIdDomainRoute: ProjectPProjectIdDomainRoute,
     ProjectPProjectIdKeywordsRoute: ProjectPProjectIdKeywordsRoute,
+    ProjectPProjectIdPromptExplorerRoute: ProjectPProjectIdPromptExplorerRoute,
     ProjectPProjectIdRankTrackingRoute:
       ProjectPProjectIdRankTrackingRouteWithChildren,
     ProjectPProjectIdSavedRoute: ProjectPProjectIdSavedRoute,

src/routes/_project/p/$projectId/brand-lookup.tsx

@@ -0,0 +1,30 @@
+import { createFileRoute, useNavigate } from "@tanstack/react-router";
+import { BrandLookupPage } from "@/client/features/ai-search/BrandLookupPage";
+import { brandLookupSearchSchema } from "@/types/schemas/ai-search";
+
+export const Route = createFileRoute("/_project/p/$projectId/brand-lookup")({
+  validateSearch: brandLookupSearchSchema,
+  component: BrandLookupRoute,
+});
+
+function BrandLookupRoute() {
+  const { projectId } = Route.useParams();
+  const navigate = useNavigate({ from: Route.fullPath });
+  const { q = "" } = Route.useSearch();
+
+  return (
+    <BrandLookupPage
+      projectId={projectId}
+      initialQuery={q}
+      onQueryChange={(nextQuery) => {
+        void navigate({
+          search: (prev) => ({
+            ...prev,
+            q: nextQuery.trim() || undefined,
+          }),
+          replace: true,
+        });
+      }}
+    />
+  );
+}

src/routes/_project/p/$projectId/prompt-explorer.tsx

@@ -0,0 +1,11 @@
+import { createFileRoute } from "@tanstack/react-router";
+import { PromptExplorerPage } from "@/client/features/ai-search/PromptExplorerPage";
+
+export const Route = createFileRoute("/_project/p/$projectId/prompt-explorer")({
+  component: PromptExplorerRoute,
+});
+
+function PromptExplorerRoute() {
+  const { projectId } = Route.useParams();
+  return <PromptExplorerPage projectId={projectId} />;
+}

src/server/features/ai-search/safeUrl.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { safeHostname, safeHttpUrl } from "./safeUrl";
+
+describe("safeHttpUrl", () => {
+  it.each([
+    "https://example.com",
+    "http://example.com",
+    "https://example.com/path?q=1#frag",
+    "https://sub.example.io",
+  ])("accepts %s", (input) => {
+    expect(safeHttpUrl(input)).toBe(input);
+  });
+
+  it.each([
+    "javascript:alert(1)",
+    "JAVASCRIPT:alert(1)",
+    "data:text/html,<script>alert(1)</script>",
+    "vbscript:msgbox(1)",
+    "file:///etc/passwd",
+    "ftp://example.com",
+    "not a url",
+    "",
+    "https://user:pass@evil.example.com",
+    "https://user@evil.example.com",
+  ])("rejects %s", (input) => {
+    expect(safeHttpUrl(input)).toBeNull();
+  });
+
+  it("returns null for null/undefined", () => {
+    expect(safeHttpUrl(null)).toBeNull();
+    expect(safeHttpUrl(undefined)).toBeNull();
+  });
+});
+
+describe("safeHostname", () => {
+  it("strips protocol and www prefix", () => {
+    expect(safeHostname("https://www.example.com/path")).toBe("example.com");
+    expect(safeHostname("http://sub.example.io")).toBe("sub.example.io");
+  });
+
+  it("returns null for unsafe schemes", () => {
+    expect(safeHostname("javascript:alert(1)")).toBeNull();
+    expect(safeHostname("data:text/html,foo")).toBeNull();
+  });
+
+  it("returns null for invalid input", () => {
+    expect(safeHostname("not a url")).toBeNull();
+    expect(safeHostname(null)).toBeNull();
+  });
+});

src/server/features/ai-search/safeUrl.ts

@@ -0,0 +1,39 @@
+/**
+ * Validate a URL string against an http(s) scheme allow-list.
+ *
+ * AI Search renders citation and top-page URLs as `<a href>` in the UI. The
+ * URLs come from either DataForSEO (mostly safe but still external) or LLM
+ * responses (untrusted — a crafted prompt can coax a model into emitting
+ * `javascript:`/`data:` payloads). Without this filter, those links are
+ * clickable from inside an authenticated session.
+ *
+ * Returns the URL string unchanged if its protocol is `http:` or `https:`,
+ * otherwise null. Callers should drop null entries before rendering.
+ */
+export function safeHttpUrl(value: string | null | undefined): string | null {
+  if (typeof value !== "string" || value.length === 0) return null;
+  try {
+    const url = new URL(value);
+    if (url.protocol !== "http:" && url.protocol !== "https:") return null;
+    // Reject `user:pass@host` — the hostname the user sees in link text may
+    // differ from where the browser authenticates.
+    if (url.username || url.password) return null;
+    return value;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Extract the bare hostname (without leading `www.`) from a URL string,
+ * returning null if the URL is invalid or uses a non-http(s) scheme.
+ */
+export function safeHostname(value: string | null | undefined): string | null {
+  const url = safeHttpUrl(value);
+  if (!url) return null;
+  try {
+    return new URL(url).hostname.replace(/^www\./, "");
+  } catch {
+    return null;
+  }
+}

src/server/features/ai-search/services/brandLookup.ts

@@ -0,0 +1,413 @@
+import { waitUntil } from "cloudflare:workers";
+import { sortBy } from "remeda";
+import type { BillingCustomerContext } from "@/server/billing/subscription";
+import { createDataforseoClient } from "@/server/lib/dataforseoClient";
+import {
+  buildLlmTarget,
+  CHATGPT_LANGUAGE_CODE,
+  CHATGPT_LOCATION_CODE,
+  type LlmPlatform,
+} from "@/server/lib/dataforseoLlm";
+import type {
+  LlmAggregatedTotal,
+  LlmMentionItem,
+  LlmTopPagesItem,
+} from "@/server/lib/dataforseoLlmSchemas";
+import { AppError } from "@/server/lib/errors";
+import { buildCacheKey, getCached, setCached } from "@/server/lib/r2-cache";
+import { safeHostname, safeHttpUrl } from "@/server/features/ai-search/safeUrl";
+import {
+  brandLookupResultSchema,
+  type BrandLookupInput,
+  type BrandLookupResult,
+} from "@/types/schemas/ai-search";
+import { detectTarget } from "@/server/features/ai-search/targetDetection";
+
+/**
+ * Brand Lookup is the AI-search analog of Domain Overview. The user types a
+ * brand name or domain; we hit DataForSEO's LLM Mentions API across ChatGPT
+ * (US-only) and Google AI Overview, then shape the response into something
+ * the UI can render directly. Stateless — no DB writes, R2 caching only.
+ */
+
+/** Brand lookup data refreshes daily; underlying API is updated monthly. */
+const BRAND_LOOKUP_TTL_SECONDS = 24 * 60 * 60;
+
+const PLATFORMS: LlmPlatform[] = ["chat_gpt", "google"];
+
+const TOP_PAGES_PER_PLATFORM = 10;
+const TOP_QUERIES_PER_PLATFORM = 25;
+
+export async function getBrandLookup(
+  input: BrandLookupInput,
+  billingCustomer: BillingCustomerContext,
+): Promise<BrandLookupResult> {
+  const detected = detectTarget(input.query);
+
+  const cacheKey = await buildCacheKey("ai-search:brand-lookup", {
+    organizationId: billingCustomer.organizationId,
+    projectId: input.projectId,
+    targetType: detected.type,
+    targetValue: detected.value.toLowerCase(),
+    locationCode: input.locationCode,
+    languageCode: input.languageCode,
+  });
+
+  const cached = brandLookupResultSchema.safeParse(await getCached(cacheKey));
+  if (cached.success) return cached.data;
+
+  const dataforseo = createDataforseoClient(billingCustomer);
+
+  // Settle each platform independently so a failure in one doesn't discard
+  // the other (which the caller already paid for via meterDataforseoCall).
+  const settled = await Promise.allSettled(
+    PLATFORMS.map((platform) =>
+      fetchPlatformData(platform, detected, input, dataforseo),
+    ),
+  );
+
+  // Credits exhaustion is global, not per-platform — re-throw immediately so
+  // the user gets a single clear "out of credits" error instead of a
+  // half-rendered result.
+  for (const settledResult of settled) {
+    if (
+      settledResult.status === "rejected" &&
+      settledResult.reason instanceof AppError &&
+      settledResult.reason.code === "INSUFFICIENT_CREDITS"
+    ) {
+      throw settledResult.reason;
+    }
+  }
+
+  const platformBundles: PlatformOutcome[] = settled.map((settledResult, i) => {
+    const platform = PLATFORMS[i];
+    if (settledResult.status === "fulfilled") {
+      return { platform, status: "success", bundle: settledResult.value };
+    }
+    console.error(
+      `ai-search.brand-lookup.${platform}.error:`,
+      settledResult.reason,
+    );
+    return { platform, status: "error", bundle: null };
+  });
+
+  const result = shapeResult({
+    query: input.query,
+    detected,
+    platformBundles,
+    userLocationCode: input.locationCode,
+    userLanguageCode: input.languageCode,
+  });
+
+  // Only cache when every platform succeeded — otherwise users would see a
+  // stale partial result for 24h and have no way to retry without busting it.
+  const allSucceeded = platformBundles.every((b) => b.status === "success");
+  if (allSucceeded && result.hasData) {
+    waitUntil(
+      setCached(cacheKey, result, BRAND_LOOKUP_TTL_SECONDS).catch((err) => {
+        console.error("ai-search.brand-lookup.cache-write failed:", err);
+      }),
+    );
+  }
+
+  return result;
+}
+
+type PlatformFetchInput = Pick<
+  BrandLookupInput,
+  "locationCode" | "languageCode"
+>;
+
+type PlatformBundle = {
+  aggregated: LlmAggregatedTotal;
+  topPages: LlmTopPagesItem[];
+  mentions: LlmMentionItem[];
+};
+
+type PlatformOutcome = {
+  platform: LlmPlatform;
+  status: "success" | "error";
+  bundle: PlatformBundle | null;
+};
+
+async function fetchPlatformData(
+  platform: LlmPlatform,
+  detected: ReturnType<typeof detectTarget>,
+  input: PlatformFetchInput,
+  dataforseo: ReturnType<typeof createDataforseoClient>,
+): Promise<PlatformBundle> {
+  const target = buildLlmTarget({
+    type: detected.type,
+    value: detected.value,
+  });
+
+  // ChatGPT mentions DB only contains US/en data per DataForSEO docs.
+  const locationCode =
+    platform === "chat_gpt" ? CHATGPT_LOCATION_CODE : input.locationCode;
+  const languageCode =
+    platform === "chat_gpt" ? CHATGPT_LANGUAGE_CODE : input.languageCode;
+
+  // `allSettled` so one sub-call failing doesn't discard the other two we
+  // already paid for. Each sub-call is metered independently upstream.
+  const [aggregated, topPages, mentions] = await Promise.allSettled([
+    dataforseo.aiSearch.aggregatedMetrics({
+      target,
+      platform,
+      locationCode,
+      languageCode,
+      internalListLimit: 20,
+    }),
+    dataforseo.aiSearch.topPages({
+      target,
+      platform,
+      locationCode,
+      languageCode,
+      itemsListLimit: TOP_PAGES_PER_PLATFORM,
+    }),
+    dataforseo.aiSearch.mentionsSearch({
+      target,
+      platform,
+      locationCode,
+      languageCode,
+      limit: TOP_QUERIES_PER_PLATFORM,
+    }),
+  ]);
+
+  rethrowIfCreditsExhausted(aggregated, topPages, mentions);
+
+  // If every sub-call failed we have nothing to render for this platform —
+  // reject so the outer `allSucceeded` gate refuses to cache a blank result.
+  const allRejected =
+    aggregated.status === "rejected" &&
+    topPages.status === "rejected" &&
+    mentions.status === "rejected";
+  if (allRejected) throw aggregated.reason;
+
+  return {
+    aggregated: fulfilledOr(aggregated, () => ({}), platform, "aggregated"),
+    topPages: fulfilledOr(topPages, () => [], platform, "topPages"),
+    mentions: fulfilledOr(mentions, () => [], platform, "mentions"),
+  };
+}
+
+function rethrowIfCreditsExhausted(
+  ...results: Array<PromiseSettledResult<unknown>>
+): void {
+  for (const result of results) {
+    if (
+      result.status === "rejected" &&
+      result.reason instanceof AppError &&
+      result.reason.code === "INSUFFICIENT_CREDITS"
+    ) {
+      throw result.reason;
+    }
+  }
+}
+
+function fulfilledOr<T>(
+  result: PromiseSettledResult<T>,
+  fallback: () => T,
+  platform: LlmPlatform,
+  label: string,
+): T {
+  if (result.status === "fulfilled") return result.value;
+  console.error(
+    `ai-search.brand-lookup.${platform}.${label}.error:`,
+    result.reason,
+  );
+  return fallback();
+}
+
+type ShapeArgs = {
+  query: string;
+  detected: ReturnType<typeof detectTarget>;
+  platformBundles: PlatformOutcome[];
+  userLocationCode: number;
+  userLanguageCode: string;
+};
+
+function shapeResult(args: ShapeArgs): BrandLookupResult {
+  const successfulBundles = args.platformBundles.filter(
+    (b): b is PlatformOutcome & { bundle: PlatformBundle } =>
+      b.status === "success" && b.bundle !== null,
+  );
+
+  // ChatGPT data is always fetched US/en (DataForSEO only indexes that
+  // locale), so when the user picks a non-US/en locale we must not fold its
+  // numbers into cross-platform totals or the monthly trend — doing so would
+  // mix two different datasets under one locale label. Per-platform rows
+  // still render ChatGPT separately with the "US-only" tooltip.
+  // Match the primary subtag so "en-US"/"en_US" still count as English.
+  const primaryLanguage = args.userLanguageCode.toLowerCase().split(/[-_]/)[0];
+  const chatGptLocaleMatches =
+    args.userLocationCode === CHATGPT_LOCATION_CODE &&
+    primaryLanguage === CHATGPT_LANGUAGE_CODE;
+
+  const perPlatform = args.platformBundles.map((outcome) => {
+    if (outcome.status === "error" || !outcome.bundle) {
+      return {
+        platform: outcome.platform,
+        status: "error" as const,
+        mentions: null,
+        aiSearchVolume: null,
+        impressions: null,
+      };
+    }
+    const platformGroup = outcome.bundle.aggregated.platform?.find(
+      (entry) => entry.key === outcome.platform,
+    );
+    return {
+      platform: outcome.platform,
+      status: "success" as const,
+      mentions: roundOrNull(platformGroup?.mentions),
+      aiSearchVolume: roundOrNull(platformGroup?.ai_search_volume),
+      impressions: roundOrNull(platformGroup?.impressions),
+    };
+  });
+
+  const aggregatablePlatforms = perPlatform.filter(
+    (p) => chatGptLocaleMatches || p.platform !== "chat_gpt",
+  );
+  const totalMentions = sumNullable(
+    aggregatablePlatforms.map((p) => p.mentions),
+  );
+  const totalAiSearchVolume = sumNullable(
+    aggregatablePlatforms.map((p) => p.aiSearchVolume),
+  );
+  const totalImpressions = sumNullable(
+    aggregatablePlatforms.map((p) => p.impressions),
+  );
+
+  const topPages = sortBy(
+    successfulBundles.flatMap((bundle) =>
+      bundle.bundle.topPages
+        .map((page) => {
+          const safeUrl = safeHttpUrl(page.key);
+          if (!safeUrl) return null;
+          return {
+            url: safeUrl,
+            domain: safeHostname(safeUrl),
+            mentions: roundOrNull(
+              page.platform?.find((entry) => entry.key === bundle.platform)
+                ?.mentions,
+            ),
+            platform: bundle.platform,
+          };
+        })
+        .filter((page): page is NonNullable<typeof page> => page !== null),
+    ),
+    [(page) => page.mentions ?? 0, "desc"],
+  ).slice(0, 20);
+
+  const topQueries = sortBy(
+    successfulBundles.flatMap((bundle) =>
+      bundle.bundle.mentions
+        .filter(
+          (item): item is LlmMentionItem & { question: string } =>
+            typeof item.question === "string" && item.question.length > 0,
+        )
+        .map((item) => ({
+          question: item.question,
+          platform: bundle.platform,
+          aiSearchVolume: roundOrNull(item.ai_search_volume),
+          firstSeenAt: item.first_response_at ?? null,
+          lastSeenAt: item.last_response_at ?? null,
+          citedSources: (item.sources ?? [])
+            .map((src) => {
+              const safeUrl = safeHttpUrl(src.url);
+              if (!safeUrl) return null;
+              return {
+                url: safeUrl,
+                domain: src.domain ?? safeHostname(safeUrl),
+                title: src.title ?? null,
+              };
+            })
+            .filter((src): src is NonNullable<typeof src> => src !== null)
+            .slice(0, 10),
+          brandsMentioned: (item.brand_entities ?? [])
+            .map((entity) => entity.title ?? "")
+            .filter((title) => title.length > 0)
+            .slice(0, 20),
+        })),
+    ),
+    [(query) => query.aiSearchVolume ?? 0, "desc"],
+  ).slice(0, 50);
+
+  const trendBundles = chatGptLocaleMatches
+    ? successfulBundles
+    : successfulBundles.filter((b) => b.platform !== "chat_gpt");
+  const monthlyVolume = aggregateMonthlyVolume(trendBundles);
+
+  const hasData =
+    (totalMentions ?? 0) > 0 ||
+    topPages.length > 0 ||
+    topQueries.length > 0 ||
+    monthlyVolume.length > 0;
+
+  return {
+    query: args.query,
+    detectedTargetType: args.detected.type,
+    resolvedTarget: args.detected.value,
+    fetchedAt: new Date().toISOString(),
+    hasData,
+    totalMentions,
+    totalAiSearchVolume,
+    totalImpressions,
+    perPlatform,
+    topPages,
+    topQueries,
+    monthlyVolume,
+  };
+}
+
+function sumNullable(values: Array<number | null>): number | null {
+  let total = 0;
+  let hasValue = false;
+  for (const value of values) {
+    if (value != null) {
+      total += value;
+      hasValue = true;
+    }
+  }
+  return hasValue ? total : null;
+}
+
+function roundOrNull(value: number | null | undefined): number | null {
+  if (value == null) return null;
+  return Math.round(value);
+}
+
+/**
+ * Sum monthly mention volume across all returned mention items, regardless of
+ * platform. Returns the most recent 12 months in chronological order.
+ */
+function aggregateMonthlyVolume(
+  bundles: Array<PlatformOutcome & { bundle: PlatformBundle }>,
+): BrandLookupResult["monthlyVolume"] {
+  const totals = new Map<string, number>();
+
+  for (const outcome of bundles) {
+    for (const mention of outcome.bundle.mentions) {
+      for (const monthly of mention.monthly_searches ?? []) {
+        if (monthly.search_volume == null) continue;
+        const key = `${monthly.year}-${monthly.month}`;
+        totals.set(key, (totals.get(key) ?? 0) + monthly.search_volume);
+      }
+    }
+  }
+
+  const entries = Array.from(totals.entries()).map(([key, volume]) => {
+    const [yearStr, monthStr] = key.split("-");
+    return {
+      year: Number(yearStr),
+      month: Number(monthStr),
+      volume: Math.round(volume),
+    };
+  });
+
+  return sortBy(
+    entries,
+    [(entry) => entry.year, "asc"],
+    [(entry) => entry.month, "asc"],
+  ).slice(-12);
+}

src/server/features/ai-search/services/promptExplorer.ts

@@ -0,0 +1,297 @@
+import { waitUntil } from "cloudflare:workers";
+import type { BillingCustomerContext } from "@/server/billing/subscription";
+import { createDataforseoClient } from "@/server/lib/dataforseoClient";
+import type { LlmResponseResult } from "@/server/lib/dataforseoLlmSchemas";
+import { AppError } from "@/server/lib/errors";
+import { buildCacheKey, getCached, setCached } from "@/server/lib/r2-cache";
+import { safeHostname, safeHttpUrl } from "@/server/features/ai-search/safeUrl";
+import {
+  promptExplorerModelResultSchema,
+  type PromptExplorerCitation,
+  type PromptExplorerInput,
+  type PromptExplorerModel,
+  type PromptExplorerModelResult,
+  type PromptExplorerResult,
+} from "@/types/schemas/ai-search";
+
+/**
+ * Prompt Explorer asks one prompt across one-to-four LLM models and renders
+ * the answers side by side. Each (prompt, model) tuple is cached in R2 for 7
+ * days because LLM responses are expensive and reasonably stable over short
+ * windows.
+ *
+ * Per-model errors are isolated: a Claude API failure must not prevent
+ * ChatGPT/Gemini/Perplexity results from rendering. We use Promise.allSettled
+ * to enforce that.
+ */
+
+/** LLM responses are stable enough for a 7-day cache. */
+const PROMPT_RESPONSE_TTL_SECONDS = 7 * 24 * 60 * 60;
+
+/** Hard cap on response length to keep payloads sane. */
+const PROMPT_RESPONSE_MAX_TOKENS = 1024;
+
+type DataforseoClient = ReturnType<typeof createDataforseoClient>;
+
+export async function explorePrompt(
+  input: PromptExplorerInput,
+  billingCustomer: BillingCustomerContext,
+): Promise<PromptExplorerResult> {
+  const dataforseo = createDataforseoClient(billingCustomer);
+  const highlightBrand = input.highlightBrand?.trim() || null;
+
+  // Dedupe models so a request like ["claude","claude"] doesn't fan out to two
+  // paid upstream calls for the same answer.
+  const uniqueModels = Array.from(new Set(input.models));
+
+  const settled = await Promise.allSettled(
+    uniqueModels.map((model) =>
+      runModel({
+        model,
+        input,
+        highlightBrand,
+        billingCustomer,
+        dataforseo,
+      }),
+    ),
+  );
+
+  const results: PromptExplorerModelResult[] = settled.map(
+    (settledResult, index) => {
+      const model = uniqueModels[index];
+      if (settledResult.status === "fulfilled") return settledResult.value;
+      return mapErrorToResult(model, settledResult.reason);
+    },
+  );
+
+  return {
+    prompt: input.prompt,
+    highlightBrand,
+    fetchedAt: new Date().toISOString(),
+    results,
+  };
+}
+
+type RunModelArgs = {
+  model: PromptExplorerModel;
+  input: PromptExplorerInput;
+  highlightBrand: string | null;
+  billingCustomer: BillingCustomerContext;
+  dataforseo: DataforseoClient;
+};
+
+async function runModel(
+  args: RunModelArgs,
+): Promise<PromptExplorerModelResult> {
+  const cacheKey = await buildCacheKey("ai-search:prompt-response", {
+    organizationId: args.billingCustomer.organizationId,
+    projectId: args.input.projectId,
+    model: args.model,
+    // Collapse only whitespace differences. Casing is deliberately preserved:
+    // prompts like "Compare Go vs go" or case-sensitive code snippets must
+    // not collide with their lowercase twins.
+    prompt: normalizePromptForCache(args.input.prompt),
+    webSearch: args.input.webSearch,
+    webSearchCountryCode: args.input.webSearchCountryCode ?? null,
+    // Bumped when prompt/payload shape changes — busts stale cache entries.
+    systemPromptV: 4,
+  });
+
+  const cached = promptExplorerModelResultSchema.safeParse(
+    await getCached(cacheKey),
+  );
+  if (cached.success && cached.data.status === "success") {
+    // highlightBrand is not part of the cache key — re-apply it so the same
+    // cached response can power different brand highlights for free.
+    return reapplyHighlightBrand(cached.data, args.highlightBrand);
+  }
+
+  const rawResponse = await fetchModelResponse(args);
+  const shaped = shapeSuccess(args.model, rawResponse);
+
+  waitUntil(
+    setCached(cacheKey, shaped, PROMPT_RESPONSE_TTL_SECONDS).catch((err) => {
+      console.error("ai-search.prompt-response.cache-write failed:", err);
+    }),
+  );
+
+  return reapplyHighlightBrand(shaped, args.highlightBrand);
+}
+
+// DataForSEO's Claude catalog caps at the 4.0 family (no Sonnet 4.5+ yet).
+const MODEL_NAMES: Record<PromptExplorerModel, string> = {
+  chat_gpt: "gpt-5",
+  claude: "claude-sonnet-4-0",
+  gemini: "gemini-2.5-pro",
+  perplexity: "sonar-reasoning-pro",
+};
+
+function fetchModelResponse(args: RunModelArgs): Promise<LlmResponseResult> {
+  return args.dataforseo.aiSearch.llmResponse({
+    modelSlug: args.model,
+    modelName: MODEL_NAMES[args.model],
+    userPrompt: args.input.prompt,
+    webSearch: args.input.webSearch,
+    webSearchCountryCode: args.input.webSearchCountryCode,
+    maxOutputTokens: PROMPT_RESPONSE_MAX_TOKENS,
+  });
+}
+
+/**
+ * Shape a raw LLM response into the brand-agnostic success payload we cache.
+ * Brand-specific fields (`matchedBrand`, `brandMentioned`) are computed
+ * separately by `reapplyHighlightBrand` on every read so one cache entry can
+ * serve requests with different `highlightBrand` values.
+ */
+function shapeSuccess(
+  model: PromptExplorerModel,
+  response: LlmResponseResult,
+): PromptExplorerModelResult {
+  const text = extractText(response);
+  const citations = extractCitations(response);
+  const fanOutQueries = (response.fan_out_queries ?? []).slice(0, 20);
+
+  return {
+    status: "success" as const,
+    model,
+    modelName: response.model_name ?? null,
+    text,
+    citations,
+    fanOutQueries,
+    brandMentioned: null,
+    outputTokens:
+      response.output_tokens != null
+        ? Math.round(response.output_tokens)
+        : null,
+    webSearch: response.web_search ?? false,
+  };
+}
+
+function reapplyHighlightBrand(
+  result: PromptExplorerModelResult,
+  highlightBrand: string | null,
+): PromptExplorerModelResult {
+  if (result.status !== "success") return result;
+  const citations = result.citations.map((citation) => ({
+    ...citation,
+    matchedBrand: matchesBrand(citation.url, citation.title, highlightBrand),
+  }));
+  return {
+    ...result,
+    citations,
+    brandMentioned: computeBrandMentioned(
+      result.text,
+      citations,
+      highlightBrand,
+    ),
+  };
+}
+
+function extractText(response: LlmResponseResult): string {
+  const textParts: string[] = [];
+  for (const item of response.items ?? []) {
+    if (item.type !== "message") continue;
+    for (const section of item.sections ?? []) {
+      if (typeof section.text === "string" && section.text.length > 0) {
+        textParts.push(section.text);
+      }
+    }
+  }
+  return textParts.join("\n\n").trim();
+}
+
+function extractCitations(
+  response: LlmResponseResult,
+): PromptExplorerCitation[] {
+  const seen = new Set<string>();
+  const citations: PromptExplorerCitation[] = [];
+
+  for (const item of response.items ?? []) {
+    if (item.type !== "message") continue;
+    for (const section of item.sections ?? []) {
+      for (const annotation of section.annotations ?? []) {
+        if (annotation.type !== "citation") continue;
+        // Drop non-http(s) URLs — LLMs can be coaxed into emitting
+        // `javascript:` payloads as "citations" and we render these as
+        // <a href> in the UI.
+        const safeUrl = safeHttpUrl(annotation.url);
+        if (!safeUrl || seen.has(safeUrl)) continue;
+        seen.add(safeUrl);
+        citations.push({
+          url: safeUrl,
+          domain: safeHostname(safeUrl),
+          title: annotation.title ?? null,
+          matchedBrand: false,
+        });
+      }
+    }
+  }
+
+  return citations.slice(0, 25);
+}
+
+function computeBrandMentioned(
+  text: string,
+  citations: PromptExplorerCitation[],
+  highlightBrand: string | null,
+): boolean | null {
+  if (!highlightBrand) return null;
+  if (citations.some((c) => c.matchedBrand)) return true;
+  return mentionRegex(highlightBrand).test(text);
+}
+
+function matchesBrand(
+  url: string,
+  title: string | null | undefined,
+  highlightBrand: string | null,
+): boolean {
+  if (!highlightBrand) return false;
+  const needle = highlightBrand.toLowerCase();
+  const haystack = `${url} ${title ?? ""}`.toLowerCase();
+  return haystack.includes(needle);
+}
+
+function mentionRegex(brand: string): RegExp {
+  // Case-insensitive match on the brand string with word-boundary guards only
+  // on sides that end in a word char — otherwise \b fails for brands like
+  // "C++" or "AT&T" where the terminal char is non-word. When a boundary char
+  // is non-word we guard with a negative lookaround against that same char so
+  // "C++" doesn't match "C+++".
+  const escaped = brand.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  const firstEscaped = brand[0].replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  const lastEscaped = brand[brand.length - 1].replace(
+    /[.*+?^${}()|[\]\\]/g,
+    "\\$&",
+  );
+  const leading = /^\w/.test(brand) ? "\\b" : `(?<!${firstEscaped})`;
+  const trailing = /\w$/.test(brand) ? "\\b" : `(?!${lastEscaped})`;
+  return new RegExp(`${leading}${escaped}${trailing}`, "i");
+}
+
+function normalizePromptForCache(prompt: string): string {
+  return prompt.trim().replace(/\s+/g, " ");
+}
+
+function mapErrorToResult(
+  model: PromptExplorerModel,
+  reason: unknown,
+): PromptExplorerModelResult {
+  if (reason instanceof AppError && reason.code === "INSUFFICIENT_CREDITS") {
+    // Re-throw INSUFFICIENT_CREDITS so the whole request surfaces it instead
+    // of silently degrading to "Claude failed" — credits exhaustion is global,
+    // not per-model.
+    throw reason;
+  }
+
+  // Log full upstream detail server-side; surface only a generic message to
+  // the client. Upstream error bodies sometimes echo request paths or
+  // diagnostic fields we don't want to leak to the browser.
+  console.error(`ai-search.prompt-response.${model}.error:`, reason);
+
+  return {
+    status: "error" as const,
+    model,
+    errorCode: "UPSTREAM_ERROR",
+    message: "This model is temporarily unavailable. Please try again.",
+  };
+}

src/server/features/ai-search/targetDetection.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from "vitest";
+import { detectTarget } from "./targetDetection";
+
+describe("detectTarget", () => {
+  it.each([
+    ["opus.pro", "opus.pro"],
+    ["https://opus.pro", "opus.pro"],
+    ["https://www.opus.pro/features", "opus.pro"],
+    ["WWW.Example.COM", "example.com"],
+    ["sub.example.io", "sub.example.io"],
+  ])("treats %s as a domain", (input, expected) => {
+    expect(detectTarget(input)).toEqual({ type: "domain", value: expected });
+  });
+
+  it.each([
+    "Opus Clip",
+    "best ai video clipper",
+    "OpenAI",
+    "GPT-5",
+    "ChatGPT pricing",
+  ])("treats '%s' as a keyword", (input) => {
+    expect(detectTarget(input)).toEqual({
+      type: "keyword",
+      value: input.trim(),
+    });
+  });
+
+  it("falls back to keyword when input has spaces but contains a dot", () => {
+    expect(detectTarget("Visit example.com today")).toEqual({
+      type: "keyword",
+      value: "Visit example.com today",
+    });
+  });
+
+  it("falls back to keyword when domain normalization throws", () => {
+    expect(detectTarget("not a real domain.")).toEqual({
+      type: "keyword",
+      value: "not a real domain.",
+    });
+  });
+
+  it("trims whitespace before classification", () => {
+    expect(detectTarget("  opus.pro  ")).toEqual({
+      type: "domain",
+      value: "opus.pro",
+    });
+  });
+});

src/server/features/ai-search/targetDetection.ts

@@ -0,0 +1,30 @@
+import { normalizeDomain } from "@/types/schemas/domain";
+
+type DetectedTarget = {
+  type: "domain" | "keyword";
+  value: string;
+};
+
+/**
+ * Decide whether free-text input is a domain (e.g. "opus.pro") or a brand
+ * keyword (e.g. "Opus Clip"). Heuristic: no whitespace + contains a dot +
+ * `normalizeDomain` produces a valid hostname.
+ */
+export function detectTarget(rawInput: string): DetectedTarget {
+  const trimmed = rawInput.trim();
+  const looksLikeDomain =
+    trimmed.length > 0 && !/\s/.test(trimmed) && trimmed.includes(".");
+
+  if (looksLikeDomain) {
+    try {
+      const hostname = normalizeDomain(trimmed);
+      if (hostname.includes(".")) {
+        return { type: "domain", value: hostname };
+      }
+    } catch {
+      // Fall through to keyword.
+    }
+  }
+
+  return { type: "keyword", value: trimmed };
+}

src/server/lib/dataforseoClient.test.ts

@@ -65,6 +65,13 @@ vi.mock("@/server/lib/dataforseoBacklinks", () => ({
   fetchReferringDomainsRaw: vi.fn(),
 }));
 
+vi.mock("@/server/lib/dataforseoLlm", () => ({
+  fetchLlmResponseRaw: vi.fn(),
+  fetchLlmAggregatedMetricsRaw: vi.fn(),
+  fetchLlmMentionsSearchRaw: vi.fn(),
+  fetchLlmTopPagesRaw: vi.fn(),
+}));
+
 import {
   createDataforseoClient,
   mapDataforseoPathToCreditFeature,
@@ -326,4 +333,34 @@ describe("mapDataforseoPathToCreditFeature", () => {
       ]),
     ).toBe("site_audit");
   });
+
+  it("maps real ai_optimization paths to ai_search", () => {
+    expect(
+      mapDataforseoPathToCreditFeature([
+        "v3",
+        "ai_optimization",
+        "llm_mentions",
+        "search",
+        "live",
+      ]),
+    ).toBe("ai_search");
+    expect(
+      mapDataforseoPathToCreditFeature([
+        "v3",
+        "ai_optimization",
+        "llm_mentions",
+        "aggregated_metrics",
+        "live",
+      ]),
+    ).toBe("ai_search");
+    expect(
+      mapDataforseoPathToCreditFeature([
+        "v3",
+        "ai_optimization",
+        "claude",
+        "llm_responses",
+        "live",
+      ]),
+    ).toBe("ai_search");
+  });
 });

src/server/lib/dataforseoClient.ts

@@ -20,6 +20,16 @@ import {
   type LabsKeywordDataItem,
   type SerpLiveItem,
 } from "@/server/lib/dataforseo";
+import {
+  fetchLlmAggregatedMetricsRaw,
+  fetchLlmMentionsSearchRaw,
+  fetchLlmResponseRaw,
+  fetchLlmTopPagesRaw,
+  type LlmAggregatedMetricsInput,
+  type LlmMentionsSearchInput,
+  type LlmResponsesInput,
+  type LlmTopPagesInput,
+} from "@/server/lib/dataforseoLlm";
 import { fetchDataforseoLighthouseResultRaw } from "@/server/lib/dataforseoLighthouse";
 import type { LighthouseStrategy } from "@/server/lib/dataforseoLighthousePayload";
 import type { StoredLighthousePayload } from "@/server/lib/lighthouseStoredPayload";
@@ -46,7 +56,8 @@ type CreditFeature =
   | "domain_overview"
   | "backlinks"
   | "site_audit"
-  | "rank_tracking";
+  | "rank_tracking"
+  | "ai_search";
 
 /**
  * Maps a DataForSEO API response path (e.g. ["v3", "dataforseo_labs", "google", "related_keywords", "live"])
@@ -65,6 +76,8 @@ export function mapDataforseoPathToCreditFeature(
       return "backlinks";
     case "serp":
       return "keyword_research";
+    case "ai_optimization":
+      return "ai_search";
     case "dataforseo_labs": {
       const endpoint = path[3] ?? "";
       if (endpoint.startsWith("domain_") || endpoint === "ranked_keywords") {
@@ -242,6 +255,24 @@ export function createDataforseoClient(customer: BillingCustomerContext) {
         );
       },
     },
+    aiSearch: {
+      mentionsSearch(input: LlmMentionsSearchInput) {
+        return meterDataforseoCall(customer, () =>
+          fetchLlmMentionsSearchRaw(input),
+        );
+      },
+      aggregatedMetrics(input: LlmAggregatedMetricsInput) {
+        return meterDataforseoCall(customer, () =>
+          fetchLlmAggregatedMetricsRaw(input),
+        );
+      },
+      topPages(input: LlmTopPagesInput) {
+        return meterDataforseoCall(customer, () => fetchLlmTopPagesRaw(input));
+      },
+      llmResponse(input: LlmResponsesInput) {
+        return meterDataforseoCall(customer, () => fetchLlmResponseRaw(input));
+      },
+    },
   } as const;
 }
 

src/server/lib/dataforseoLlm.ts

@@ -0,0 +1,362 @@
+import { z } from "zod";
+import {
+  llmAggregatedTotalSchema,
+  llmMentionItemSchema,
+  llmResponseEnvelopeSchema,
+  llmResponseResultSchema,
+  llmTopPagesItemSchema,
+  type LlmAggregatedTotal,
+  type LlmDataforseoTask,
+  type LlmMentionItem,
+  type LlmResponseResult,
+  type LlmTopPagesItem,
+} from "@/server/lib/dataforseoLlmSchemas";
+import type { DataforseoApiResponse } from "@/server/lib/dataforseoCost";
+import { AppError } from "@/server/lib/errors";
+import { getRequiredEnvValue } from "@/server/lib/runtime-env";
+
+/**
+ * Raw HTTP wrappers for DataForSEO AI Optimization endpoints.
+ *
+ * The official `dataforseo-client` SDK doesn't ship typed bindings for these
+ * endpoints yet, so we POST raw JSON. Every wrapper returns billing metadata
+ * alongside parsed data so the calling client can meter usage with Autumn.
+ */
+
+const API_BASE = "https://api.dataforseo.com";
+const MAX_DATAFORSEO_ERROR_PAYLOAD_LENGTH = 1600;
+
+// ChatGPT mention/response data is only available for US/en per DataForSEO docs.
+export const CHATGPT_LOCATION_CODE = 2840;
+export const CHATGPT_LANGUAGE_CODE = "en";
+
+export type LlmPlatform = "chat_gpt" | "google";
+
+// ---------------------------------------------------------------------------
+// Shared HTTP / response handling
+// ---------------------------------------------------------------------------
+
+async function postLlm(path: string, payload: unknown): Promise<unknown> {
+  const apiKey = await getRequiredEnvValue("DATAFORSEO_API_KEY");
+  const response = await fetch(`${API_BASE}${path}`, {
+    method: "POST",
+    headers: {
+      Authorization: `Basic ${apiKey}`,
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(payload),
+  });
+
+  const rawText = await response.text();
+
+  if (!response.ok) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO HTTP ${response.status} on ${path}. Response: ${truncate(rawText)}`,
+    );
+  }
+
+  try {
+    return JSON.parse(rawText);
+  } catch {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned non-JSON response: ${truncate(rawText)}`,
+    );
+  }
+}
+
+function truncate(text: string): string {
+  return text.length > MAX_DATAFORSEO_ERROR_PAYLOAD_LENGTH
+    ? `${text.slice(0, MAX_DATAFORSEO_ERROR_PAYLOAD_LENGTH)}... [truncated]`
+    : text;
+}
+
+function parseEnvelope(path: string, raw: unknown): LlmDataforseoTask {
+  const envelope = llmResponseEnvelopeSchema.safeParse(raw);
+  if (!envelope.success) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned an invalid envelope: ${envelope.error.issues
+        .slice(0, 3)
+        .map((i) => i.message)
+        .join("; ")}`,
+    );
+  }
+
+  const data = envelope.data;
+  if (data.status_code !== 20000) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      data.status_message || `DataForSEO ${path} request failed`,
+    );
+  }
+
+  const task = data.tasks?.[0];
+  if (!task) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} response missing task`,
+    );
+  }
+
+  if (task.status_code !== 20000) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      task.status_message || `DataForSEO ${path} task failed`,
+    );
+  }
+
+  return task;
+}
+
+function buildBilling(task: LlmDataforseoTask) {
+  return {
+    path: task.path,
+    costUsd: task.cost,
+    resultCount: task.result_count ?? null,
+  };
+}
+
+// ---------------------------------------------------------------------------
+// Target builders — DataForSEO's `target` array accepts domain OR keyword
+// entries. We always pass exactly one target per call.
+// ---------------------------------------------------------------------------
+
+type LlmTarget =
+  | {
+      domain: string;
+      include_subdomains?: boolean;
+      search_filter?: "include" | "exclude";
+      search_scope?: string[];
+    }
+  | {
+      keyword: string;
+      search_filter?: "include" | "exclude";
+      search_scope?: string[];
+      match_type?: "word_match" | "partial_match";
+    };
+
+export function buildLlmTarget(input: {
+  type: "domain" | "keyword";
+  value: string;
+}): LlmTarget {
+  if (input.type === "domain") {
+    return {
+      domain: input.value,
+      include_subdomains: true,
+      search_filter: "include",
+      search_scope: ["any"],
+    };
+  }
+  return {
+    keyword: input.value,
+    search_filter: "include",
+    search_scope: ["any", "brand_entities"],
+    match_type: "word_match",
+  };
+}
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Search Live
+// ---------------------------------------------------------------------------
+
+export type LlmMentionsSearchInput = {
+  target: LlmTarget;
+  platform: LlmPlatform;
+  locationCode: number;
+  languageCode: string;
+  limit?: number;
+};
+
+export async function fetchLlmMentionsSearchRaw(
+  input: LlmMentionsSearchInput,
+): Promise<DataforseoApiResponse<LlmMentionItem[]>> {
+  const path = "/v3/ai_optimization/llm_mentions/search/live";
+  const payload = [
+    {
+      target: [input.target],
+      platform: input.platform,
+      location_code: input.locationCode,
+      language_code: input.languageCode,
+      limit: clampLimit(input.limit ?? 100, 1, 1000),
+    },
+  ];
+
+  const raw = await postLlm(path, payload);
+  const task = parseEnvelope(path, raw);
+
+  const items = z
+    .array(llmMentionItemSchema)
+    .safeParse(extractItems(task.result));
+  if (!items.success) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned an invalid mention items shape`,
+    );
+  }
+
+  return { data: items.data, billing: buildBilling(task) };
+}
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Aggregated Metrics Live
+// ---------------------------------------------------------------------------
+
+export type LlmAggregatedMetricsInput = {
+  target: LlmTarget;
+  platform: LlmPlatform;
+  locationCode: number;
+  languageCode: string;
+  internalListLimit?: number;
+};
+
+export async function fetchLlmAggregatedMetricsRaw(
+  input: LlmAggregatedMetricsInput,
+): Promise<DataforseoApiResponse<LlmAggregatedTotal>> {
+  const path = "/v3/ai_optimization/llm_mentions/aggregated_metrics/live";
+  const payload = [
+    {
+      target: [input.target],
+      platform: input.platform,
+      location_code: input.locationCode,
+      language_code: input.languageCode,
+      internal_list_limit: clampLimit(input.internalListLimit ?? 10, 1, 20),
+    },
+  ];
+
+  const raw = await postLlm(path, payload);
+  const task = parseEnvelope(path, raw);
+
+  const totalRaw = extractFirstResult(task.result)?.total ?? {};
+  const total = llmAggregatedTotalSchema.safeParse(totalRaw);
+  if (!total.success) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned an invalid aggregated metrics shape`,
+    );
+  }
+
+  return { data: total.data, billing: buildBilling(task) };
+}
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Top Pages Live
+// ---------------------------------------------------------------------------
+
+export type LlmTopPagesInput = {
+  target: LlmTarget;
+  platform: LlmPlatform;
+  locationCode: number;
+  languageCode: string;
+  itemsListLimit?: number;
+};
+
+export async function fetchLlmTopPagesRaw(
+  input: LlmTopPagesInput,
+): Promise<DataforseoApiResponse<LlmTopPagesItem[]>> {
+  const path = "/v3/ai_optimization/llm_mentions/top_pages/live";
+  const payload = [
+    {
+      target: [input.target],
+      platform: input.platform,
+      location_code: input.locationCode,
+      language_code: input.languageCode,
+      links_scope: "sources",
+      items_list_limit: clampLimit(input.itemsListLimit ?? 10, 1, 10),
+      internal_list_limit: 5,
+    },
+  ];
+
+  const raw = await postLlm(path, payload);
+  const task = parseEnvelope(path, raw);
+
+  const items = z
+    .array(llmTopPagesItemSchema)
+    .safeParse(extractFirstResult(task.result)?.items ?? []);
+  if (!items.success) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned an invalid top pages shape`,
+    );
+  }
+
+  return { data: items.data, billing: buildBilling(task) };
+}
+
+// ---------------------------------------------------------------------------
+// LLM Responses Live (per-model)
+// ---------------------------------------------------------------------------
+
+export type LlmResponseModelSlug =
+  | "chat_gpt"
+  | "claude"
+  | "gemini"
+  | "perplexity";
+
+export type LlmResponsesInput = {
+  userPrompt: string;
+  modelSlug: LlmResponseModelSlug;
+  modelName: string;
+  webSearch?: boolean;
+  maxOutputTokens?: number;
+  /** Two-letter ISO country code used to geolocate the web-search component. */
+  webSearchCountryCode?: string;
+};
+
+export async function fetchLlmResponseRaw(
+  input: LlmResponsesInput,
+): Promise<DataforseoApiResponse<LlmResponseResult>> {
+  const path = `/v3/ai_optimization/${input.modelSlug}/llm_responses/live`;
+  const payload = [
+    {
+      user_prompt: input.userPrompt,
+      model_name: input.modelName,
+      web_search: input.webSearch ?? true,
+      max_output_tokens: clampLimit(input.maxOutputTokens ?? 1024, 256, 4096),
+      ...(input.webSearchCountryCode && {
+        web_search_country_iso_code: input.webSearchCountryCode,
+      }),
+    },
+  ];
+
+  const raw = await postLlm(path, payload);
+  const task = parseEnvelope(path, raw);
+
+  const first = extractFirstResult(task.result) as unknown;
+  const result = llmResponseResultSchema.safeParse(first ?? {});
+  if (!result.success) {
+    throw new AppError(
+      "INTERNAL_ERROR",
+      `DataForSEO ${path} returned an invalid response shape`,
+    );
+  }
+
+  return { data: result.data, billing: buildBilling(task) };
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function clampLimit(value: number, min: number, max: number): number {
+  return Math.min(max, Math.max(min, Math.floor(value)));
+}
+
+function extractFirstResult(
+  result: LlmDataforseoTask["result"],
+): Record<string, unknown> | null {
+  const first = result?.[0];
+  return isRecord(first) ? first : null;
+}
+
+function extractItems(result: LlmDataforseoTask["result"]): unknown[] {
+  const first = extractFirstResult(result);
+  if (!first) return [];
+  const items = first.items;
+  return Array.isArray(items) ? items : [];
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}

src/server/lib/dataforseoLlmSchemas.ts

@@ -0,0 +1,159 @@
+import { z } from "zod";
+
+/**
+ * Zod schemas for DataForSEO AI Optimization endpoints.
+ *
+ * The DataForSEO SDK does not yet ship typed bindings for `/ai_optimization/*`,
+ * so we POST raw JSON and validate the responses ourselves. All schemas use
+ * `.passthrough()` to tolerate fields the API may add in future versions.
+ */
+
+// ---------------------------------------------------------------------------
+// LLM Mentions — shared bits
+// ---------------------------------------------------------------------------
+
+const monthlyVolumeSchema = z
+  .object({
+    year: z.number().int(),
+    month: z.number().int().min(1).max(12),
+    search_volume: z.number().nullable().optional(),
+  })
+  .passthrough();
+
+const mentionSourceSchema = z
+  .object({
+    url: z.string().nullable().optional(),
+    title: z.string().nullable().optional(),
+    domain: z.string().nullable().optional(),
+  })
+  .passthrough();
+
+const brandEntitySchema = z
+  .object({
+    title: z.string().nullable().optional(),
+  })
+  .passthrough();
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Search — `/v3/ai_optimization/llm_mentions/search/live`
+// Returns one row per LLM answer that matched the target.
+// ---------------------------------------------------------------------------
+
+export const llmMentionItemSchema = z
+  .object({
+    question: z.string().nullable().optional(),
+    sources: z.array(mentionSourceSchema).nullable().optional(),
+    ai_search_volume: z.number().nullable().optional(),
+    monthly_searches: z.array(monthlyVolumeSchema).nullable().optional(),
+    first_response_at: z.string().nullable().optional(),
+    last_response_at: z.string().nullable().optional(),
+    brand_entities: z.array(brandEntitySchema).nullable().optional(),
+  })
+  .passthrough();
+
+export type LlmMentionItem = z.infer<typeof llmMentionItemSchema>;
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Aggregated Metrics — `/v3/ai_optimization/llm_mentions/aggregated_metrics/live`
+// Each metric category contains an array of group elements with mention counts.
+// ---------------------------------------------------------------------------
+
+const groupElementSchema = z
+  .object({
+    type: z.string().nullable().optional(),
+    key: z.string().nullable().optional(),
+    mentions: z.number().nullable().optional(),
+    ai_search_volume: z.number().nullable().optional(),
+    impressions: z.number().nullable().optional(),
+  })
+  .passthrough();
+
+export const llmAggregatedTotalSchema = z
+  .object({
+    platform: z.array(groupElementSchema).nullable().optional(),
+  })
+  .passthrough();
+
+export type LlmAggregatedTotal = z.infer<typeof llmAggregatedTotalSchema>;
+
+// ---------------------------------------------------------------------------
+// LLM Mentions Top Pages — `/v3/ai_optimization/llm_mentions/top_pages/live`
+// Each item has `key` = page URL plus the same group-element arrays.
+// ---------------------------------------------------------------------------
+
+export const llmTopPagesItemSchema = z
+  .object({
+    key: z.string().nullable().optional(),
+    platform: z.array(groupElementSchema).nullable().optional(),
+  })
+  .passthrough();
+
+export type LlmTopPagesItem = z.infer<typeof llmTopPagesItemSchema>;
+
+// ---------------------------------------------------------------------------
+// LLM Responses — shared between ChatGPT/Claude/Gemini/Perplexity
+// All four model endpoints return the same envelope shape.
+// ---------------------------------------------------------------------------
+
+const responseAnnotationSchema = z
+  .object({
+    type: z.string().nullable().optional(),
+    title: z.string().nullable().optional(),
+    url: z.string().nullable().optional(),
+  })
+  .passthrough();
+
+const responseSectionSchema = z
+  .object({
+    type: z.string().nullable().optional(),
+    text: z.string().nullable().optional(),
+    annotations: z.array(responseAnnotationSchema).nullable().optional(),
+  })
+  .passthrough();
+
+const responseItemSchema = z
+  .object({
+    type: z.string().nullable().optional(),
+    sections: z.array(responseSectionSchema).nullable().optional(),
+  })
+  .passthrough();
+
+export const llmResponseResultSchema = z
+  .object({
+    model_name: z.string().nullable().optional(),
+    output_tokens: z.number().nullable().optional(),
+    web_search: z.boolean().nullable().optional(),
+    items: z.array(responseItemSchema).nullable().optional(),
+    fan_out_queries: z.array(z.string()).nullable().optional(),
+  })
+  .passthrough();
+
+export type LlmResponseResult = z.infer<typeof llmResponseResultSchema>;
+
+// ---------------------------------------------------------------------------
+// Top-level envelope used by every AI Optimization endpoint.
+// We re-declare here (instead of reusing dataforseoSchemas.ts) because the
+// `result` shape differs from Labs/SERP — items are not always under
+// `result[0].items` and totals/items can both be present.
+// ---------------------------------------------------------------------------
+
+const llmTaskSchema = z
+  .object({
+    status_code: z.number().optional(),
+    status_message: z.string().optional(),
+    path: z.array(z.string()),
+    cost: z.number(),
+    result_count: z.number().nullable().optional(),
+    result: z.array(z.unknown()).nullable().optional(),
+  })
+  .passthrough();
+
+export type LlmDataforseoTask = z.infer<typeof llmTaskSchema>;
+
+export const llmResponseEnvelopeSchema = z
+  .object({
+    status_code: z.number().optional(),
+    status_message: z.string().optional(),
+    tasks: z.array(llmTaskSchema).optional(),
+  })
+  .passthrough();

src/serverFunctions/ai-search.ts

@@ -0,0 +1,41 @@
+import { createServerFn } from "@tanstack/react-start";
+import { getBrandLookup } from "@/server/features/ai-search/services/brandLookup";
+import { explorePrompt as runExplorePrompt } from "@/server/features/ai-search/services/promptExplorer";
+import { customerHasPaidPlan } from "@/server/billing/subscription";
+import { AppError } from "@/server/lib/errors";
+import { isHostedServerAuthMode } from "@/server/lib/runtime-env";
+import { requireProjectContext } from "@/serverFunctions/middleware";
+import {
+  brandLookupInputSchema,
+  promptExplorerInputSchema,
+} from "@/types/schemas/ai-search";
+
+/**
+ * AI Visibility endpoints are gated behind the paid plan in hosted mode
+ * because each call fans out to several paid DataForSEO requests. Self-hosted
+ * deployments pay DataForSEO directly and aren't gated.
+ */
+async function assertPaidPlan(organizationId: string) {
+  if (!(await isHostedServerAuthMode())) return;
+  if (await customerHasPaidPlan(organizationId)) return;
+  throw new AppError(
+    "PAYMENT_REQUIRED",
+    "Upgrade to the paid plan to use AI Visibility",
+  );
+}
+
+export const lookupBrand = createServerFn({ method: "POST" })
+  .middleware(requireProjectContext)
+  .inputValidator((data: unknown) => brandLookupInputSchema.parse(data))
+  .handler(async ({ data, context }) => {
+    await assertPaidPlan(context.organizationId);
+    return getBrandLookup({ ...data, projectId: context.projectId }, context);
+  });
+
+export const explorePrompt = createServerFn({ method: "POST" })
+  .middleware(requireProjectContext)
+  .inputValidator((data: unknown) => promptExplorerInputSchema.parse(data))
+  .handler(async ({ data, context }) => {
+    await assertPaidPlan(context.organizationId);
+    return runExplorePrompt({ ...data, projectId: context.projectId }, context);
+  });

src/shared/billing.ts

@@ -17,3 +17,15 @@ export function roundUsdForBilling(value: number) {
 export function autumnSeoDataCreditsToUsd(credits: number) {
   return credits / AUTUMN_SEO_DATA_CREDITS_PER_USD;
 }
+
+/**
+ * Convert a raw DataForSEO USD cost into the USD amount a hosted customer is
+ * actually billed, applying the platform markup. Use this when displaying
+ * cost estimates so the number matches what the user will be charged.
+ *
+ * Self-hosted deployments pay DataForSEO directly at the raw rate and should
+ * show the raw number — gate at the call site with `isHostedClientAuthMode`.
+ */
+export function applyBillingMarkupUsd(rawUsd: number): number {
+  return roundUsdForBilling(rawUsd * SEO_DATA_COST_MARKUP);
+}

src/types/schemas/ai-search.ts

@@ -0,0 +1,203 @@
+import { z } from "zod";
+
+/**
+ * Input + output schemas for the AI Search feature (Brand Lookup + Prompt
+ * Explorer). These two pages are fully stateless — the user types something,
+ * we hit DataForSEO, and we render. Schemas live here so they can be reused
+ * by server functions, services, R2 cache validation, and the client UI.
+ */
+
+// ---------------------------------------------------------------------------
+// Brand Lookup
+// ---------------------------------------------------------------------------
+
+/** Maximum allowed length for a free-text brand or domain search input. */
+export const BRAND_LOOKUP_MAX_INPUT_LENGTH = 250;
+
+export const brandLookupInputSchema = z.object({
+  projectId: z.string().min(1),
+  query: z.string().trim().min(1).max(BRAND_LOOKUP_MAX_INPUT_LENGTH),
+  locationCode: z.number().int().positive().default(2840),
+  languageCode: z.string().min(2).max(8).default("en"),
+});
+
+export type BrandLookupInput = z.infer<typeof brandLookupInputSchema>;
+
+const brandPlatformBreakdownSchema = z.object({
+  platform: z.enum(["chat_gpt", "google"]),
+  status: z.enum(["success", "error"]),
+  mentions: z.number().int().nonnegative().nullable(),
+  aiSearchVolume: z.number().int().nonnegative().nullable(),
+  impressions: z.number().int().nonnegative().nullable(),
+});
+
+const brandTopPageSchema = z.object({
+  url: z.string(),
+  domain: z.string().nullable(),
+  mentions: z.number().int().nonnegative().nullable(),
+  platform: z.enum(["chat_gpt", "google"]),
+});
+
+const brandTopQuerySchema = z.object({
+  question: z.string(),
+  platform: z.enum(["chat_gpt", "google"]),
+  aiSearchVolume: z.number().int().nonnegative().nullable(),
+  firstSeenAt: z.string().nullable(),
+  lastSeenAt: z.string().nullable(),
+  citedSources: z
+    .array(
+      z.object({
+        url: z.string(),
+        domain: z.string().nullable(),
+        title: z.string().nullable(),
+      }),
+    )
+    .max(10),
+  brandsMentioned: z.array(z.string()).max(20),
+});
+
+const brandMonthlyVolumeSchema = z.object({
+  year: z.number().int(),
+  month: z.number().int().min(1).max(12),
+  volume: z.number().int().nonnegative().nullable(),
+});
+
+export const brandLookupResultSchema = z.object({
+  query: z.string(),
+  detectedTargetType: z.enum(["domain", "keyword"]),
+  resolvedTarget: z.string(),
+  fetchedAt: z.string(),
+  hasData: z.boolean(),
+  totalMentions: z.number().int().nonnegative().nullable(),
+  totalAiSearchVolume: z.number().int().nonnegative().nullable(),
+  totalImpressions: z.number().int().nonnegative().nullable(),
+  perPlatform: z.array(brandPlatformBreakdownSchema),
+  topPages: z.array(brandTopPageSchema).max(20),
+  topQueries: z.array(brandTopQuerySchema).max(50),
+  monthlyVolume: z.array(brandMonthlyVolumeSchema),
+});
+
+export type BrandLookupResult = z.infer<typeof brandLookupResultSchema>;
+
+// ---------------------------------------------------------------------------
+// Prompt Explorer
+// ---------------------------------------------------------------------------
+
+export const PROMPT_EXPLORER_MAX_PROMPT_LENGTH = 500;
+
+/** Stable identifiers for the four LLM models we expose. */
+export const PROMPT_EXPLORER_MODELS = [
+  "chat_gpt",
+  "claude",
+  "gemini",
+  "perplexity",
+] as const;
+
+export const promptExplorerModelSchema = z.enum(PROMPT_EXPLORER_MODELS);
+export type PromptExplorerModel = z.infer<typeof promptExplorerModelSchema>;
+
+/**
+ * Two-letter ISO country code passed as `web_search_country_iso_code` to each
+ * LLM Responses endpoint. Affects the web-search component of the answer
+ * (Perplexity, GPT-5, Gemini, Claude when web search is on). DataForSEO
+ * accepts any ISO-2 for ChatGPT/Gemini; Claude/Perplexity have a finite
+ * supported list. We only expose codes covered by all four.
+ */
+export const WEB_SEARCH_COUNTRY_CODES = [
+  "US",
+  "GB",
+  "CA",
+  "AU",
+  "IE",
+  "DE",
+  "FR",
+  "ES",
+  "IT",
+  "NL",
+  "PT",
+  "PL",
+  "SE",
+  "NO",
+  "DK",
+  "BR",
+  "MX",
+  "IN",
+  "JP",
+  "KR",
+  "SG",
+  "HK",
+  "TW",
+  "ZA",
+] as const;
+
+export const webSearchCountryCodeSchema = z.enum(WEB_SEARCH_COUNTRY_CODES);
+export type WebSearchCountryCode = z.infer<typeof webSearchCountryCodeSchema>;
+
+export const promptExplorerInputSchema = z.object({
+  projectId: z.string().min(1),
+  prompt: z.string().trim().min(1).max(PROMPT_EXPLORER_MAX_PROMPT_LENGTH),
+  models: z.array(promptExplorerModelSchema).min(1).max(4),
+  highlightBrand: z
+    .string()
+    .trim()
+    .min(1)
+    .max(BRAND_LOOKUP_MAX_INPUT_LENGTH)
+    .optional(),
+  webSearch: z.boolean().default(true),
+  webSearchCountryCode: webSearchCountryCodeSchema.optional(),
+});
+
+export type PromptExplorerInput = z.infer<typeof promptExplorerInputSchema>;
+
+const promptExplorerCitationSchema = z.object({
+  url: z.string(),
+  domain: z.string().nullable(),
+  title: z.string().nullable(),
+  matchedBrand: z.boolean(),
+});
+
+export type PromptExplorerCitation = z.infer<
+  typeof promptExplorerCitationSchema
+>;
+
+export const promptExplorerModelResultSchema = z.discriminatedUnion("status", [
+  z.object({
+    status: z.literal("success"),
+    model: promptExplorerModelSchema,
+    modelName: z.string().nullable(),
+    text: z.string(),
+    citations: z.array(promptExplorerCitationSchema),
+    fanOutQueries: z.array(z.string()),
+    brandMentioned: z.boolean().nullable(),
+    outputTokens: z.number().int().nonnegative().nullable(),
+    webSearch: z.boolean(),
+  }),
+  z.object({
+    status: z.literal("error"),
+    model: promptExplorerModelSchema,
+    errorCode: z.literal("UPSTREAM_ERROR"),
+    message: z.string(),
+  }),
+]);
+
+export type PromptExplorerModelResult = z.infer<
+  typeof promptExplorerModelResultSchema
+>;
+
+export const promptExplorerResultSchema = z.object({
+  prompt: z.string(),
+  highlightBrand: z.string().nullable(),
+  fetchedAt: z.string(),
+  results: z.array(promptExplorerModelResultSchema),
+});
+
+export type PromptExplorerResult = z.infer<typeof promptExplorerResultSchema>;
+
+// ---------------------------------------------------------------------------
+// URL search params
+// ---------------------------------------------------------------------------
+
+/** /p/$projectId/brand-lookup query params — `q` keeps the lookup shareable. */
+export const brandLookupSearchSchema = z.object({
+  q: z.string().optional(),
+});