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Estimates whether text was machine-written and flags the sentences
GPTZero scores a document for machine authorship and highlights the individual sentences that drove the score, which is the part schools and publishers actually act on rather than the headline percentage. Paid tiers lift the monthly word ceiling, add batch uploads and writing-provenance reports, and open up a developer API. The free tier is metered in words rather than documents, so one long thesis can consume most of a month.
The pricing page renders its numbers client-side and served none to a plain fetch, so these come from secondary trackers and should be re-checked in a browser. Reported structure: free at 10,000 words/month with a 10,000-character cap per scan; Essential about $14.99/month month-to-month or $8.33 on annual; Premium about $23.99 or $12.99 annual for 300,000 words and unlimited batch uploads; Professional around $24.99 adding API access and reporting. Annual billing is advertised at roughly 45% off. Team and enterprise pricing is quoted by sales.
Use tool ↗The most institutionally accepted of the detectors, and the sentence-level highlighting is what makes a result defensible in a conversation with a student — but no detector is evidence, and pricing this one required leaving the vendor's own site.
Watch out: Quotas are counted in words, not documents. A 10,000-word cap per scan means a full dissertation has to be split, and the free monthly allowance is gone after one of them.
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