AI FactScan
Don't just read the AI answer.
Check what it cites.
"AI can make mistakes", but how wrong could it be?
That disclaimer at the bottom of every AI chat? AI FactScan takes it seriously.
Every citation, graded. Instantly.
Browser extension for ChatGPT · Claude · Gemini · Perplexity · DeepSeek · Microsoft Copilot · Grok
Expert sources or random blogs?
We grade the sources so you don't have to guess.
Even if you open every link — can you actually judge the source? We give each citation an A–F grade in seconds.
You decide what to trust.
Auto-Extraction
Citations are everywhere. Time is not. Stop clicking every link. We quickly scan all citations from the AI's response for you.
Visual Grading
Transparency, at a glance. Instantly see the credibility ratio of the provided sources through our intuitive A–F grading system.
Built from recognized source signals.
AI FactScan does not decide whether a claim is true. It gives citations a source-quality signal based on recognized references, negative signals, and model-risk context.
AI hallucination rate
AI hallucination rate references Vectara Hallucination Leaderboard metrics for model-level context across systems such as ChatGPT, Gemini, Claude, and DeepSeek.
Authority and reference signals
Public source signals include attributed SCImago rankings, Crossref, OpenAlex, DOAJ, WHO, OECD, BIS, and official government or institutional directories.
Negative and review signals
CRED-1 negative signals, content-farm lists, invalid resolver checks, and AI self-reference detection.
Support AI FactScan.
Free for everyone. Support keeps the source database current and the tool alive.
- Unlimited citation scans
- Cloud source signals on every scan
- Citation verification (DOI / arXiv / PubMed)
- Source concentration analysis
- Full HTML report export
- Priority access to database updates
- Use with up to four browser installations
Free plan includes 5 citation scans per day — no account required.
Become a Supporter
Private by design.
Citation checks run locally on your device. Only domain names are sent to FactScan servers for Supporter lookups — never your full URLs, page content, or AI responses.
Common questions
AI FactScan provides citation quality signals — it doesn't judge whether AI claims are true. Treat C, D, or F sources as a prompt to read the source yourself, or ask your LLM for better citations.
Tip: Ask your LLM to cite properly. Paste this into your LLM instructions:
1. Always provide original source URLs for all factual claims.
2. If a source is unavailable, say so clearly — don't fabricate.
3. Present every citation as a URL, DOI, arXiv ID, or PubMed ID.
No. AI FactScan doesn't verify whether AI-generated content is accurate. It audits the quality of the sources AI cites — whether a site has editorial standards, whether AI is citing its own ecosystem, or whether a link is a content farm.
AI has three citation problems: hallucination (links to articles or domains that don't exist), self-citation (Google citing Google products, OpenAI citing the OpenAI blog), and empty links (href="" that redirects to the AI platform's homepage — looks like a citation, leads nowhere). AI FactScan detects all three.
A — Official / authoritative source (peer-reviewed journals, government agencies, major international media)
B — Trusted reference source (media and institutions with editorial standards)
C — Media / community / general source — worth verifying before citing
D — Content farm / review recommended — proceed with caution
F — Self-reference / invalid source (AI self-citation or empty links)
GPTZero detects whether text was written by AI. AI FactScan audits the credibility of the sources AI gives you. Two different problems.
ChatGPT, Gemini, Claude, Perplexity, Grok, DeepSeek, and Microsoft Copilot.
Each Supporter license can be used with up to four browser installations. Chrome, Edge, and separate browser profiles are counted individually.