DetectAI Watermarks

DetectAI Watermarks takes a different approach to AI text detection: instead of perplexity scores that produce high false-positive rates, it looks for the invisible statistical watermarks embedded by modern models like GPT-4o, Claude and Gemini. The practical wins are zero false positives on human text — genuine writing stops getting flagged — and instant results that run entirely in the browser with no registration. It is completely free and unlimited for basic detection. The caveat is inherent to the approach: text without an embedded watermark, or from models that do not embed one, will not be caught, so it complements rather than replaces human judgement. As a free first-pass check, it is one of the fairest detectors available.