Analyst verdictAI writing detector built for educators
The most practical AI detector for teachers, with sentence-level highlights and a real free tier. Like every detector, treat its score as a lead, not proof.
What it is
GPTZero estimates whether text was written by AI and highlights the sentences driving the score. It adds writing replay, plagiarism checks and integrations with Google Docs, Google Classroom and Canvas. A free account covers about 10,000 words a month; paid plans are priced by monthly word allowance (Premium 300,000 words, Professional 500,000) and shown in local currency. Checked November 2026.
Best for
- Teachers and professors
- Editors spot-checking drafts
What we like
- Sentence-level highlighting
- Usable free tier
- Classroom and Docs integrations
What to watch
- False positives happen, so never use it as the only evidence
- Heavily paraphrased AI text can slip through
- Prices vary by region
Rankings
Where GPTZero ranks
Alternatives
Alternatives and head-to-heads
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