A browser extension that checks whether claims are accurate in real time, using live web search. Verify text, video audio, and files, right where you find them.
From a highlighted text to a whole video, get a grounded verdict with sources.
Highlight any text or scan a full article. Claims are verified with web search and rated on a true to false scale.
Fact-check a YouTube or any video tab while it plays. The audio is transcribed and spoken claims are checked as they happen.
Upload a PDF, image, or text file to check the claims inside it, or ask follow-up questions grounded in exactly what the file says.
Paste comments, tweets, or reviews to read the overall mood, the positive to negative split, and the themes driving it.
Check whether an image or document was made by AI, using verifiable Content Credentials where present, with an honest likelihood otherwise.
False claims come with the accurate fact, and you can ask follow-up questions about any result right on the card.
Three different tools for trusting what you read. Here's what each one actually checks.
| Capability | LitmusAI | NewsGuard | Ground News |
|---|---|---|---|
| Highlight and Check Facts | ✓ | ✕ | ✕ |
| Live Video Audio | ✓ | ✕ | ✕ |
| Files Upload | ✓ | ✕ | ✕ |
| Sentiment Analysis | ✓ | ✕ | ✕ |
| AI Content Detector | ✓ | ✕ | ✕ |
| Cited Sources | ✓ | ✕ | ✕ |
| Bring Your Own API Key | ✓ | ✕ | ✕ |
| Corrections on Flagged Claims | ✓ | ✕ | ✕ |
| Free Tier | ✓ | ✓ | ✓ |
Based on each product's public listing at the time of writing. They stack, not compete, a reliable outlet can still publish one false claim.
Start free. Upgrade with your own API key for unlimited checks and more features.
Install the extension, sign in, then choose your plan. Pro and Max run on your own API key, added right in the extension. Cancel anytime. Payments handled securely by Stripe.
Your check history lives only in your browser. Content you check is used only to return your result, forwarded to the AI providers that power the checks (Anthropic, OpenAI, Google Gemini, or Perplexity, depending on your setup, and Deepgram for audio). We never sell it, and there is no ad tracking. See the privacy policy for the full picture.
What people ask before installing LitmusAI?
Start a check any of these ways:
LitmusAI then searches the live web for sources related to the claim and shows you a verdict, ranging from true to false, along with the sources it used.
Yes. The Free plan gives you:
If you check things often, Pro and Max remove that limit and add more features on top, like page scanning, document checks, and sentiment analysis.
Pro is built for everyday fact-checking, with no daily limit:
Max includes everything in Pro, plus:
Free works right out of the box, no key needed. Pro and Max ask you to add your own API key inside the extension after you sign in. This means:
Read the full privacy policy for the complete picture.