1 free check

Use your own API key

Enter your Anthropic API key for unlimited checks. Your key is stored only in your browser's session memory — it's never sent to any server and disappears when you close this tab.

Get a key at console.anthropic.com.

🔒 Stored only in sessionStorage — cleared when you close this tab.

Just browsing?

You've used your free check

Add your own Anthropic API key to keep going — it's pay-as-you-go with no subscription, and each check costs less than a cent.

Get a key at console.anthropic.com

0 characters

Try an example

Running 11-step fact-check pipeline…

Decomposing claims · Evaluating sources · Detecting red flags

Overall verdict
MFS Score