GPTinf - AI humanizer, detector, and plagiarism checker in one tab

Hey Product Hunt 👋 We started GPTinf because our own blog drafts kept coming back from editors with "this sounds like ChatGPT." Every humanizer we tried had the same failure: to get the detector score down, it pushed the text toward casual register — and the piece stopped sounding like the person who wrote it. So we didn't build on top of an LLM. The engine restructures sentences at the grammatical level: new subject, different verb constructions, clauses repositioned, sentences merged or split. The training objective penalizes quality degradation, which is the part most tools skip. Then we stopped sending people to a second tab to check the result. The detector runs automatically after every rewrite and shows pass/fail across 8 detectors right under the output. Plagiarism checker, grammar checker, paraphraser, and readability checker are in the same platform. A few honest limitations, because you'll find them anyway: — Detectors update constantly. Nobody can promise a permanent result, and we don't. — The readability checker is a single Flesch score, not a multi-formula report. — No API and no browser extension yet. It's the most common request we get. Free tier is 300 words per request, no account, file upload and the full detector included. PRODUCTHUNT30 gets you 30% off the first month if you want the paid plans. What I'd really like to hear: paste your own text in and tell me whether the output still sounds like you. That's the metric we care about, and it's the hardest one to self-assess. I'm here all day.