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AI detectors

What each tool claims, where it fails, and what its own documentation says about relying on it.

TurnitinThe dominant academic integrity platform. Its AI writing report gives a percentage of the document it believes was generated.GPTZeroA widely used AI text detector with a free tier, popular with teachers and editors.Originality.aiA detector marketed to publishers and SEO teams, sold on accuracy and used to screen content at scale.PangramA detector with a strong reputation for accuracy, used by publishers and increasingly by institutions.CopyleaksPlagiarism and AI detection combined, common in education and publishing workflows.Winston AIA detector marketed to educators and publishers, with an emphasis on accuracy claims.SaplingA writing assistant with an AI detector attached, often encountered inside another tool.ZeroGPTA free detector with very high traffic, frequently the tool behind a casual accusation from a reader or client.

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Other signposts

Who is accusing youTypes of evidenceContract clausesResponding to an accusation