GPTZero - AI detector preserving authenticity by identifying LLM-generated content

What it does

GPTZero is an AI detection tool that identifies text generated by large language models (LLMs) such as ChatGPT, GPT-4, Gemini, Claude, and Llama. It offers a free AI checker, an advanced scan with sentence-level highlights, a hallucination detector for fake citations, a plagiarism checker, grammar checker, authorship verification with video replay, and an AI Vision browser extension for real-time detection. The platform also provides an AI Tutor for writing feedback and integrates with Canvas, Google Classroom, Chrome, Google Docs, and Zapier.

Who it is for

GPTZero primarily serves educators and students in over 3,500 colleges and hundreds of institutions to foster academic integrity. It is also used by publishers, recruiters, copywriters, marketers, cybersecurity professionals, and ML engineers who need to verify authenticity of text, defend against AI phishing, or train models with human data.

Why it matters

As AI-generated content becomes widespread, GPTZero helps preserve human authenticity in writing. Independent benchmarks (e.g., Penn State AI Research Lab, RAID) show GPTZero achieves 99% accuracy in classifying AI vs. human text, with a 1% false positive rate for human text and 96.5% accuracy on mixed documents. It is debiased for ESL learners, reducing false accusations. The tool provides transparency through writing reports and video replay, enabling constructive conversations rather than punitive measures.

Launch signal

GPTZero was founded in January 2023 by Edward Tian. It quickly gained traction, serving over 17 million users and 1 million educators. It has been featured in TechCrunch, Outlook News, and received positive reviews from organizations like the American Federation of Teachers. In 2025, G2 ranked GPTZero the #1 most trusted and reliable AI tool. The company was acquired by Superhuman, as noted on its website.

Brand and naming

The name "GPTZero" directly references GPT (Generative Pre-trained Transformer) and the concept of zeroing in on AI content, implying a baseline or ground truth for detection. The tagline "Preserve What's Human" positions the brand as a guardian of authenticity. The brand is memorable due to its clear, descriptive name and strong association with education and trust.