AI Hallucination & Fact Checker
Extract every factual claim from AI-generated text and get a hallucination risk score with verification strategies.
Try an example:
Paste text to fact-check against the web
Real Wikipedia + DuckDuckGo searches. Every source cited. No hallucinated URLs.
Frequently asked questions
How does the fact checker verify claims?+
It extracts verifiable claims from your text using deterministic pattern analysis — statistics, dates, named entities, quotes, and URLs — then cross-references the highest-risk claims against live web sources (Wikipedia and DuckDuckGo instant answers). Each claim gets a confidence rating with links to the real sources that were checked.
Does it use an AI model to decide what is true?+
No. Unlike LLM-based fact checkers, this tool does not ask an AI model whether something sounds correct. Claim extraction is rule-based and verification cites real, live URLs, so results are reproducible and citations are never hallucinated.
What does the trust score mean?+
The trust score summarizes how the analyzed claims held up: how many were verified against sources, how many were only partially supported, and how many were unverifiable or conflicting. A lower score means more of the specific claims in the text could not be confirmed — it does not automatically mean the text is false.
Will it catch every hallucination?+
No. It only checks claims that are specific enough to verify, it verifies up to eight of the highest-risk claims per request, and its sources do not cover every topic. An "unverifiable" result means no supporting source was found — the claim may still be true. Always verify important claims against primary sources yourself.
Is my text sent to a server?+
Yes. The text is sent to our server, which performs the claim extraction and queries public sources like Wikipedia to verify them. A draft of your text is also kept in your own browser’s local storage so you don’t lose it on refresh. Avoid pasting confidential material.
Is this tool free?+
Yes. The hallucination and fact checker is completely free and requires no account. Paste up to 10,000 characters and get a claim-by-claim report in a few seconds.