An ensemble of three open-source detectors, calibrated against the same 200-essay corpus we publish our weekly proof on. Paste, score, decide whether to polish.
This free tool is an ensemble of three open-source detectors. It correlates 0.84 with the commercial detectors that universities and journals actually use (GPTZero, Turnitin, Originality.ai). It is not perfect.
What it’s good for: a directional read on whether your text reads as AI-typical. What it’s not good for: a guarantee that you’ll pass a specific commercial detector. For that, polish with Rewritelyapp, we run our output through the actual commercial detectors and show the per-detector verdict.