AI FactScan — Verify Sources in AI Answers

Check sources in ChatGPT, Claude, Gemini and more. Review AI citations, grade source quality A-F and inspect references.

Verify sources in an AI answer or AI summary before you cite or share it. AI FactScan is an AI citation checker and AI source checker for ChatGPT, Claude, Gemini and other supported AI chat platforms. It collects citation links, grades source quality A-F, and helps you review the original sources in a Chrome side panel. Concerned about hallucinated citations, fake citations or fake references? Review the original sources and identify references that need closer inspection before using them in a paper, report or article. WHAT YOU CAN CHECK • Source quality: See A-F grades for the sources behind an AI answer and decide which references need closer review. • Source warning signals: Spot known content-farm domains, AI self-references and invalid resolver patterns. • Academic identifiers: Check supported DOI, arXiv and PubMed links and flag identifiers that cannot be found. • Citation diversity: See whether an answer relies on the same domains or repeats the same articles and papers. • Review records: Export a full HTML analysis report for later review. HOW TO CHECK CITATIONS IN AN AI ANSWER 1. Open a supported AI chat platform. 2. Use the page picker to select the answer you want to inspect. 3. Review its extracted citation links and source grades in the side panel. 4. Open the original sources to read the evidence and check whether they support the answer. HOW SOURCE GRADES WORK AI FactScan grades sources using academic rankings, research indexes, official institutional directories and explicit warning signals. Negative signals include the CRED-1 dataset and content-farm lists. A source grade helps you prioritize what to review. VERIFY DOI, ARXIV AND PUBMED REFERENCES Need to verify a DOI, arXiv ID or PubMed reference? AI FactScan checks supported identifiers and flags those that cannot be found, so you know which references to investigate before citing them. GET STARTED Start with 5 free citation scans per day, no account required. Some advanced features require a paid plan. Visit aifactscan.com for current plans and details. PRIVACY AI FactScan is local-first. Some features use limited external requests. Full AI answers, page content and browsing history are not sent to the FactScan API. See our Privacy Policy for details. Add AI FactScan to Chrome and check the sources in your next AI answer. Learn more about source grading, see AI FactScan in action, and explore the FAQ on our official website: https://aifactscan.com/ AI FactScan is an independent extension. It is not affiliated with, sponsored by or endorsed by OpenAI, Anthropic, Google, Microsoft, Perplexity or other mentioned service providers. All trademarks belong to their respective owners.