One of the earliest and most widely used AI text detectors, founded by Princeton student Edward Tian in January 2023. Detects AI-generated text across models (ChatGPT, Gemini, Claude, Llama, etc.), highlights sentence-level AI content, and offers integrations with Google Docs and a Chrome extension. Current product also includes plagiarism detection, grammar feedback, and writing-process verification. Note: the vendor\'s \"99.9% accuracy\" claim is contested—independent tests have documented false positives on human-written text (e.g., a high-school essay flagged 62% AI; the US Constitution flagged as AI-generated). GPTZero itself states results should not be used to punish or as a final verdict, and that no detector is 100% accurate. Has an ESL de-biasing claim. ARR reported at ~$24M (36Kr, Mar 2026). Free tier available; paid pricing on official site.
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