About this guide
This guide gathers the signs of AI-written prose that published studies, maintained guides, and working editors point to. The research was run on September 24, 2026, and every number was checked against the original study or report.
The symbol on each entry grades its source, not how likely a text is to be machine-written. Tap any evidence line to see the study, the fix, and how often careful human writers do the same thing. No single tell proves anything. Several together are a reason to look closer.