I Built a Chrome Extension That Fact-Checks AI Outputs — Here's How It Works

About 27% of AI outputs contain fabricated claims. I kept running into this problem — ChatGPT confidently citing studies that don't exist, Gemini inventing statistics, Claude hallucinating facts. So I built a tool to catch it. What is Aretify? Aretify is a Chrome extension that adds a "Verify" button to AI responses on ChatGPT, Claude, and Gemini. One click extracts every factual claim and checks it against real sources. The Tech Stack Frontend: Next.js on Vercel Backend: FastAPI on Railway Database: Supabase (PostgreSQL) Cache: Upstash Redis Extension: Chrome Manifest V3, side panel architecture How Verification Works When you click "Verify," here's what happens: Claim Extraction — The AI response is sent to Groq for fast claim extraction. Each individual factual claim is isolated. Evidence Search — Each claim is searched against 15+ evidence sources simultaneously: Semantic Scholar, PubMed, OpenAlex, Crossref, Europe PMC, Wikipedia, Wikidata, Google Fact Check, GDELT, NewsAPI, Brave