Vibeprint

Vibeprint tells you whether the page you're on was likely built with an AI coding tool — Lovable, Bolt.new, Base44 — and shows you exactly which signals it found. It also recognises visual builders — Framer, Webflow, Wix and Replit — and is careful to say that those identify the tool rather than prove AI authorship. Click the toolbar icon. It reads the page, matches it against known builder fingerprints, and gives you a verdict with the evidence behind it. Nothing runs until you click. WHAT MAKES IT DIFFERENT Most of the guesswork in this space is vibes. Vibeprint is calibrated against 71 real websites captured live, with published accuracy numbers: precision 1.000, recall 0.967. The hand-built half deliberately includes the hardest cases — sites like vercel.com and ui.shadcn.com that use the exact fonts, components and dark gradient aesthetic people associate with AI output. None of them are falsely accused. EVIDENCE, NOT ACCUSATIONS Every verdict comes with a breakdown, grouped by how much it actually proves: • Conclusive — identifies a specific builder (a hosted runtime script, a generator tag) • Suggestive — common in generated code, but not exclusive to it • Circumstantial — also seen on hand-built sites A confident verdict requires conclusive evidence. Buzzwords, a default font, and platform hosting can never add up to an accusation on their own — that rule is enforced in code, not just intended. HONEST ABOUT LIMITS A site can be AI-built and leave no trace. Builders that host what they generate (Lovable, Bolt, Base44, Framer) leave fingerprints behind, but only Lovable, Bolt and Base44's fingerprints prove AI authorship — Framer's proves only which tool was used. Tools like v0 hand you code you deploy yourself, leaving nothing to detect. When there's no evidence, Vibeprint says "Not enough signal" instead of guessing. That's a real answer, not a failure. PRIVACY • The page is read in memory only, while you look at the result — nothing is kept • No network requests — nothing leaves your browser, ever • No background process, no content scripts, no storage • No host permissions: it cannot touch a page you haven't asked it to scan • Fully open source Permissions used: activeTab (temporary access to the current tab, only when you click) and scripting (to run the reader on that page). Source code and accuracy methodology: https://github.com/erkanrzgc/vibeprint