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]