GPTZero
AI detector used by over a million educators, now part of Superhuman.
4.3(101 reviews)MatchFast editorial rating, not a verified user review average.
- Price
- Free + paid (price not published)
- Founded
- Not available
- HQ
- Not available
- Employees
- Not available
About GPTZero
GPTZero checks whether text came from Claude, ChatGPT, Gemini or similar models, and has broadened into hallucination detection, plagiarism and grammar. Writing Replay is the unusual one: it reconstructs how a document was typed as video proof of authorship. The homepage says it is now part of Superhuman and reports 17 million users and a million educators. Pricing is split between annual and monthly, but figures were not shown.
Key platforms
Core service areas
AI detector
Flags Claude, ChatGPT, Gemini and GPT-generated text
Writing Replay
Video reconstruction of how a document was written
Hallucination detector
Checks AI claims
Plagiarism checker
Source matching
Grammar checker
Writing quality feedback
Chrome extension
Checks inside the browser
Pros and cons
Pros
- Writing Replay provides authorship evidence rather than a probability score
- Free checks up to 10,000 characters without an account
- Official AI detector partner of the American Federation of Teachers
- Chrome extension for checking in place
Cons
- Reviewers report false positives on human-written text
- Prices are not displayed on the pricing page
Frequently asked questions
- Is GPTZero free?
- You can check up to 10,000 characters without an account; larger submissions need an upgrade. Q: Who owns GPTZero? A: Its homepage states it is now part of Superhuman. Q: What are good alternatives to GPTZero? A: Originality.ai, Copyleaks and Winston AI.
Best for
Teachers and editors who need evidence of how a document was written, not just a score.
Pricing details
A free tier allows checks up to 10,000 characters without an account. Paid plans are offered on annual (marked 45% saving) and monthly billing, but exact prices were not displayed at time of review. Details: https://gptzero.me/pricing
Review notes
- Last reviewed
October 4, 2026
- Source
gptzero.me | https
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