kitio.aiAdded Oct 28, 2026
GPTZero
FreemiumAI detector that flags machine-written text for teachers and editors
What is GPTZero?
GPTZero estimates whether a piece of text was written by a person or by AI models such as ChatGPT, Claude and Gemini. It is widely used by teachers and also by publishers and recruiters, and includes a plagiarism checker on paid plans.
Paste text or upload files to get a probability score with highlighted sentences. A Chrome extension can replay how a Google Doc was written, and LMS integrations work with Canvas and Google Classroom. An API supports bulk scanning.
Features
- AI probability score
- Sentence highlighting
- Writing replay in Google Docs
- Plagiarism checker
- API
Tags
Releases
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Organization
GPTZero
🇺🇸 United States
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Freemium
- Paid options from
- Not listed
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Pros and cons
Pros
- Free tier for regular checks
- Writing replay shows the drafting process
- LMS integrations
Cons
- Scores are probabilities, not proof
- Can misjudge non-native English writing
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Q&A
What is GPTZero?
GPTZero estimates whether a piece of text was written by a person or by AI models such as ChatGPT, Claude and Gemini. It is widely used by teachers and also by publishers and recruiters, and includes a plagiarism checker on paid plans.
Can GPTZero prove a student used AI?
No. It gives a probability, and GPTZero itself advises using results as a starting point for a conversation, not as sole evidence.
How much does GPTZero cost?
GPTZero is freemium.
Is there a free version of GPTZero?
Yes. GPTZero has a free plan, and paid plans add more usage and features.
What are the main features of GPTZero?
AI probability score, Sentence highlighting, Writing replay in Google Docs, Plagiarism checker, API.
Who makes GPTZero?
GPTZero is made by GPTZero.
What are the best alternatives to GPTZero?
Popular alternatives include Turnitin, Plag, PlagiarismCheck.org.