AI Bouncer

Detects AI-generated text locally. No API key, no downloads.

AI Bouncer estimates the probability that a web page or pasted text was written by an AI language model — entirely on your device. Click the icon and the current page is analysed. You get: • A probability score (0–100%) with a plain-language verdict: Very Likely Human → Very Likely AI • A confidence level (high / medium / low) • A signal-by-signal breakdown explaining why (rhythm, vocabulary, register, surface patterns, lexical habits, genre) • A genre flag when formal or conversational text makes heuristic detection less reliable PRIVATE BY DESIGN No API key. No account. No server. No analytics. The text never leaves your browser. HOW IT WORKS Instead of matching word lists alone, AI Bouncer measures the statistical shape of text — sentence-length variation, vocabulary distribution, entropy, contraction and filler-phrase rates — and combines six independent signal groups using log-likelihood ratios. Bands are intentionally wide: when evidence is weak, it says "Inconclusive" instead of guessing. LIMITATIONS No detector is perfect. Paraphrased AI text, formal writing and short texts (<200 words) are harder to judge. Treat the result as one signal, not proof. Free for noncommercial use. Source: https://github.com/krstp/ai-bouncer