GPTZero

Founded by Edward Tian in 2023

Detect AI-generated text from ChatGPT, Gemini, Claude, and more

Pricing model

Free Tier

Rating

★ People love it

Time to value

Immediate

You can use GPTZero to scan documents and text for AI-generated content from models like ChatGPT, GPT-5, Gemini, and Claude. It gives an overall AI probability score and highlights specific sentences likely written by AI. It also includes plagiarism checking, grammar feedback, citation verification, hallucination detection, and writing replay to verify authentic human authorship. It integrates with Google Docs, Canvas, Google Classroom, and offers a Chrome extension and API.

What GPTZero does

Paste text and get an overall AI probability score instantlyHighlight individual sentences flagged as likely AI-generatedUpload documents to scan for plagiarism from outside sourcesCheck grammar and spelling errors in submitted writingVerify citations and flag hallucinated or unsupported factsWatch a writing replay video to confirm authentic typing patternsIntegrate AI detection into Canvas or Google Classroom assignment workflowsCall the API to run AI detection checks programmaticallySentence-by-sentence AI highlighting shows exactly which parts of a document are AI-generatedWriting replay records how a document was typed to verify authentic human authorshipHallucination detector flags factually inaccurate or made-up claims in textMultilingual detection supports English, German, French, Spanish, and PortugueseCanvas and Google Classroom integrations let teachers scan student assignments directlyCitation and fact checker verifies sources and finds reliable referencesReduced false-positive rate for ESL writers to avoid wrongly flagging non-native EnglishAPI access allows embedding AI detection directly into third-party systems