LitmusAI: AI Fact Checker

Fact-check anything, instantly. Live audio, text, and files, grounded in real sources.

LitmusAI checks claims in real time with AI and live web search, right in your browser. Highlight text, scan a page, listen to a video, or upload a file, and get a rated verdict with sources. Runs on Claude out of the box, or bring your own key for Claude, GPT, Gemini, or Perplexity. CHECK FACTS ANYWHERE • Text: highlight a passage and check it from the toolbar or right-click menu. • Pages: scan an article and verify every claim in one click. • Video audio: capture a tab's audio and fact-check spoken claims live. • Files: upload a PDF, image, or text file and check the claims inside it. CLEAR RESULTS • Each verdict sits on a false-to-true scale, with a confidence score and sources. • False or misleading claims come with the correct fact, not just a flag. • Ask follow-up questions on any result. • Tune claim sensitivity, from conservative to aggressive, and stop a page scan mid-check anytime. STAYS TIDY • Three tabs: Feed, Assets, and Sentiment. • Delete individual results or clear a tab in one tap. • A docked side panel keeps the UI open while a video plays. MORE TOOLS • Sentiment analysis: paste comments or reviews to see the crowd's mood and what's driving it. • AI-origin detection: check if an image or document is AI-generated, using C2PA Content Credentials where present. PLANS Free includes 5 highlight checks, no card required. Pro and Max unlock page scans, file checks, sentiment analysis, and AI-origin detection, run unlimited on your own AI provider key (Claude, GPT, Gemini, or Perplexity). Max adds live audio fact-checking. Manage or cancel anytime from the extension. PRIVACY Check history stays in your browser. On the free plan, content you check is sent to the LitmusAI service, which forwards it to Anthropic (and Deepgram for audio) to run the check, then is not stored. If you bring your own API key, checks are sent directly from your browser to your chosen provider, never through LitmusAI's servers. Sign in with an emailed code, no password. No tracking. Full details in the privacy policy.