GPTZero

GPTZero is an AI content detector that checks whether text was written by a person or generated by a model. You paste text, up to 10,000 characters in the free scanner, and receive an overall AI score along with sentence by sentence detection. It is built to recognize output from major models including ChatGPT, Claude, Gemini and Llama, and offers an Advanced Scan that the vendor says has top tier accuracy based on independent benchmarking. The company is now part of Superhuman. Beyond detection, GPTZero provides a plagiarism checker, grammar and writing feedback, and an AI tutor for building responsible writing habits. A Google Docs extension records the writing process, so reviewers can watch a document being written, see copy and pastes, and spot unnatural typing patterns, which gives video style proof of authorship. A Chrome extension brings automatic detection to Gmail, Google Docs, Classroom and social media, and the platform integrates with learning management systems including Canvas and Google Classroom. Its primary audience is educators and students, along with publishers, editors and teams that need to verify originality. Organizations can buy shared team credits with unified billing, and an API with ready to use code in 17 languages lets developers embed detection in their own platforms. The scanner has a free tier. Paid plans include a Professional plan sold per seat with monthly and annual billing, where the annual option is advertised as saving 45 percent, plus team and enterprise plans through sales. Specific dollar prices did not render on the page reviewed, so amounts are not quoted here.