WRT-08Free plan
GPTZero
Estimates whether a text was written by AI and highlights the sentences that look generated.
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What is GPTZero?
GPTZero estimates whether a text was written by AI. Teachers, editors and writers use it to review submissions. It highlights sentences that look machine-generated and gives an overall probability.
Used for
Estimates whether a text was written by AI and highlights the sentences that look generated.
Best for
Checking AI-written text
Price
GPTZero has a free plan with usage limits, and paid plans add more.
How to start for free
- Go to gptzero.me.
- Paste text or upload a file.
- Read the score and the highlighted sentences.
Strengths
- Simple and quick
- Sentence-level highlights
Limits to know
- No detector is fully accurate
- Monthly word limit on free
Learn more
Free plans and limits change often. Check the current details on the official GPTZero website before relying on it for important work. Last reviewed October 2026.