- category
- detector
- maturity
- established
- approach
- AI-text detection using statistical signals (perplexity and burstiness) plus trained classifiers to label text as human, AI, or mixed across major models (ChatGPT, Claude, Gemini, Llama).
- access
- freemium
- owns
- Detects AI-generated text and checks writing quality, aimed at educators and editors; offers writing-origin reports and learning-management-system integrations.
- distinctFrom
- Unlike a watermark-remover (which defeats detection) or a provenance standard (which cryptographically signs origin), GPTZero is a classifier that scores whether existing text is AI-written.
- notes
- Acquired by Superhuman (formerly Grammarly) on June 23, 2026; GPTZero's AI and hallucination detectors are being integrated into Superhuman Go as an authenticity layer. Co-founders Edward Tian and Alex Cui joined Superhuman. Vendor claims 99% accuracy and 17 million users; self-reported and fabrication-prone, not independently verified.
