Claude Fact Checker

Fact-check any text on the web with Claude AI. Select text on any webpage, click the floating "Fact Check" button (or right-click → "Fact Check with Claude"), and receive a structured, detailed analysis in seconds. HOW IT WORKS 1. Highlight text containing factual claims 2. Click the green Fact Check button or use the right-click context menu 3. Claude AI analyzes each claim independently 4. Review the color-coded verdict with confidence levels WHAT YOU GET • Overall verdict: Verified, Mostly True, Mixed, Mostly False, False, or Unverifiable • Confidence level: High, Medium, or Low • Claim-by-claim breakdown with individual status and reasoning for each claim • "What I Can Verify" and "What I Cannot Verify" sections for full transparency • One-click copy of the full analysis report BUILT ON HONESTY Claude clearly labels what it can and cannot verify. Claims requiring real-time data, breaking news, or post-training information are marked as "Unverifiable" rather than guessed at. This tool provides AI-assisted reasoning — not absolute truth. Always cross-reference with authoritative sources for critical decisions. REQUIREMENTS • A Claude API key from Anthropic (https://console.anthropic.com) • API usage is billed by Anthropic based on your plan PRIVACY • Your API key is stored locally in Chrome's encrypted storage • Selected text is sent only to Anthropic's API for analysis and is not stored • No tracking, analytics, or data collection • Full privacy policy: [YOUR PRIVACY POLICY URL]