Fact Sentinel: AI Fact Checker

AI fact checker for any page. Right-click to verify claims instantly, or auto-detect misinformation & fake news as you browse.

Fact Sentinel is an AI fact checker for your browser. Verify any claim in seconds, or let automatic misinformation detection flag false claims on news articles and social media as you browse. HOW IT WORKS - Select text on any page, right-click, and choose "Fact Check with FactSentinel" (or press Ctrl+Shift+F / Cmd+Shift+F) - Get a verdict, a confidence score, and a sourced explanation - Cross-checked with two AI models (OpenAI GPT + Anthropic Claude) so one model's mistake doesn't become your misinformation AUTOMATIC MISINFORMATION DETECTION Passive monitoring quietly scans articles and social posts for checkable claims and alerts you when something looks false -- with smart notification limits so it never gets noisy. TRY IT FREE -- NO SIGNUP - 3 free fact-checks as a guest, no account needed - Free account: 10 manual checks + 50 automatic page scans per month - $29 one-time lifetime license: unlimited checking with your own OpenAI or Anthropic API key (your key stays on your device) - $10/month Platform subscription: expanded limits on our managed AI PRIVACY FIRST - Verification history stays on your device - Bring-your-own-key mode: your API keys are stored locally, never on our servers, and your queries are never logged Works everywhere you read online. Get a second opinion before you share.