An independent statistical AI-text checker.
Prosechecker estimates whether English text was written by an AI model. It runs a small offline N-gram language model together with text statistics, no external AI service is called, and nothing you paste is stored.
AI-text detection has two failure modes that the marketing usually hides: it flags real human writing (especially from non-native English writers), and it still misses machine writing. Worse, most tools return a score with no explanation. Prosechecker is built to be honest about both limits: every result is a statistical estimate, it shows the underlying signals, and it is explicitly not proof of authorship.
The online checker analyses your text on our own server and keeps no record of it. The offline Python package runs entirely on your machine, nothing leaves your computer. See our Privacy Policy for details.
A free browser checker (no signup), and one-time licences for the offline Python package (Personal / Commercial / OEM). See Product & pricing.
Support, licensing, or OEM enquiries: contact us.