GPTZero
AI content detector that checks text for AI-generated writing and writing quality (the tag
GPTZero is an AI detection tool that scans pasted text or uploaded documents to estimate how much of the writing was produced by a large language model, highlighting the specific phrases flagged. It classifies text from models including ChatGPT, Claude, Gemini, and Llama, and can handle mixed documents where human and AI writing are combined. Related tools include a plagiarism checker, writing replay with video proof of the writing process, grammar feedback, an AI Tutor, and a hallucination detector.
Detection runs through a Chrome extension, Google Docs, Google Classroom, Canvas, Zapier, and an API with ready-to-use code in multiple languages. Advanced Scan offers deeper analysis, while writing reports and human writing verification help confirm authorship. The platform is SOC 2 compliant and meets FERPA, GDPR, and CCPA requirements.
GPTZero serves educators, students, writers, and organizations in education, hiring, publishing, and legal work. A free account is available, with scans beyond 10,000 characters requiring registration. Paid plans are offered on annual or monthly billing, with seat-based Professional and Team editions that include shared credits and unified billing, plus a separate API pricing tier.
12 alternatives to GPTZero
Ranked by how well each tool replaces GPTZero: shared features, audience, price and popularity.
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Free planOpen source66 out of 100 matchContact salesDetect AI content, humanize AI-generated writing, and check images, voice, video and PDFs.
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Plagiarism detector that checks text originality, verifies authorship, and detects AI‑in‑w
Covers 1 of 7 key features.
60 out of 100 matchContact sales