Guides
Guides
Answers built from primary sources: the detector companies' own documentation, the published studies, and our own price data. Each guide is dated and lists its sources at the end.
Is GPTZero accurate?
GPTZero claims 99% accuracy. Independent tests find it rarely flags human writing but often misses humanized or edited AI text. Dated, sourced numbers.
Guide · primary sourcesDoes Turnitin detect AI humanizers?
Turnitin says it has detected text run through AI humanizers since August 2025, in English only. What teachers see, what students don't, and the limits.
Free tiersFree AI humanizers: how many words you really get
Every free tier's word cap and sign-up rule, side by side.