ClaimCheck audits a ChatGPT or Perplexity deep-research report. For every cited claim it fetches the source, reads it, and tells you honestly whether the source really supports what the report says.
Add to Chrome — Free See ProNo account · No tracking · Honest by design — it never fabricates support
ClaimCheck is conservative on purpose: when in doubt it says Partial or Not-Found rather than a false Supported. The "Not-Found" signal — a source that doesn't actually back the claim — is the most valuable thing it can tell you.
The cited source genuinely backs up the claim. You can stand behind it.
The source supports the claim only partly, or with caveats the report glossed over.
The source does not contain support for the claim. The most valuable signal — catch it before your client does.
The cited URL doesn't resolve (404 / timeout). The citation points nowhere.
Blocked by a paywall or Cloudflare. ClaimCheck tells you to verify manually rather than guess.
ClaimCheck reads sources using your own OpenAI or Anthropic API key. It's stored only on your device and sent only to that provider — never to us.
Because the AI calls run on your key, we pay nothing per audit. That's why Pro is a single $29 purchase, not a monthly bill.
Made for consultants, analysts and researchers who put their name on what an AI drafted — and need to know the citations hold up.
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$29 one-time, no subscription
ClaimCheck uses your own OpenAI or Anthropic API key to read each cited source and judge whether it supports the claim. The key is stored only on your device and sent only to the provider you chose — never to us. Because we pay nothing for the AI calls, ClaimCheck is a one-time purchase with no recurring fee.
AI deep-research reports on ChatGPT and Perplexity, in Chrome and Chromium browsers (Edge, Brave, Arc, Comet). ClaimCheck reads the cited claims in the report you are viewing when you click the extension.
Your license key arrives by email immediately after checkout. Open the extension's settings, paste the key, and Pro unlocks on the spot — on up to 5 devices.
None. No account, no analytics, no tracking. The extension fetches the cited source URLs to read them, sends the claim and source text to your chosen LLM provider with your own API key, and validates your license key with Polar. Nothing else leaves your browser, and your API key never goes to us. See the privacy policy.
Yes — if it doesn't work for you, reply to your receipt email within 14 days and we'll refund you, no questions asked.
Yes. CiteBridge exports a Perplexity thread's citations to Zotero, BibTeX or RIS; ClaimCheck verifies that those cited sources actually back the claims. Export, then verify.