AICheatCheck (TheChecker.AI)

AICheatCheck began as a tool aimed at educators who wanted to know whether student writing was machine-generated. The service has since rebranded and now runs at TheChecker.AI, but it keeps the same core idea: paste text, get a reading of how likely it looks AI-written, and see which parts of the document stand out.

The engine combines several statistical signals, including perplexity and burstiness, to estimate whether a passage reads like human prose or like model output. Results come back in seconds with an overall probability score plus sentence- and paragraph-level highlights, so users can see exactly which lines raised flags rather than just a single vanity number.

The platform also ships a humanizer that rewrites flat, machine-sounding sentences while trying to preserve meaning, names and figures. A free demo lets anyone test a limited amount of text before committing to a paid plan, and the service advertises use by a large number of students, writers and educational institutions.