AI detectors
Detectors serve educators checking student work and publishers checking commissioned content. Paid plans are inexpensive, so fit matters more than budget.
| Details | Pricing | Free plan | Free trial | Best for | Review | |||
|---|---|---|---|---|---|---|---|---|
 Winston AI | 8.0 / 10 | Freemium | $10/mo | Yes | Yes | Teachers and academic institutions verifying student submission authenticity | Review Winston AI | |
| 7.6 / 10 | Custom | Customcontact sales | — | — | Universities | Review Turnitin | ||
 Copyleaks | 7.5 / 10 | Freemium | $8.99/mo | Yes | Yes | Academic institutions enforcing originality policies | Review Copyleaks | |
 GPTZero | 7.5 / 10 | Freemium | $8.33/mo | Yes | Yes | Educators and schools enforcing academic integrity policies | Review GPTZero | |
 Originality.ai | 7.2 / 10 | Paid | $14.95/mo | — | Yes | SEO agencies managing freelance or AI-assisted content pipelines | Review Originality.ai | |
 ZeroGPT | 7.2 / 10 | Freemium | ~$9.99/moapproximate | Yes | Yes | Educators and academic institutions checking student submissions for AI authorship | Review ZeroGPT | |
 Sightengine | 7.0 / 10 | Freemium | $29/mo | Yes | — | Marketplaces moderating user-uploaded images and video | Review Sightengine | |
 Content at Scale | 6.5 / 10 | Freemium | $249/mo | Yes | Yes | SEO agencies producing high-volume long-form blog content | Review Content at Scale | |
 Writer.com (AI Detector product) | 6.5 / 10 | Free Trial | Free | — | Yes | Educators verifying student submissions | Review Writer.com (AI Detector product) |
Winston AI8.0 / 10Teachers and academic institutions verifying student submission authenticity
Copyleaks7.5 / 10Academic institutions enforcing originality policies
GPTZero7.5 / 10Educators and schools enforcing academic integrity policies
Originality.ai7.2 / 10SEO agencies managing freelance or AI-assisted content pipelines
ZeroGPT7.2 / 10Educators and academic institutions checking student submissions for AI authorship
Content at Scale6.5 / 10SEO agencies producing high-volume long-form blog content
Writer.com (AI Detector product)6.5 / 10Educators verifying student submissions
About AI detectors
AI detectors estimate whether text, or in Sightengine's case images and video, was produced by AI. They serve 2 main buyers: educators checking student work (GPTZero, Winston AI, Copyleaks, Turnitin) and publishers or SEO agencies checking commissioned content (Originality.ai). Paid plans are inexpensive, from $8.33/mo, and 6 of the 9 tools have a free tier, so fit matters more than budget. The list also includes Content at Scale, a writing platform with a free detector attached.
What to compare before you choose
Credits per word or page
Detectors meter checks by words, pages or credits, and free allowances are small: Winston AI's trial, for example, includes 2K credits. Convert each allowance into the number of documents you check each month, and compare one-time credit packs with subscriptions if you only check occasionally.
Built for classrooms or content teams
Most detectors here are built around academic integrity, and our review flags GPTZero for SEO and marketing teams. Publishers and agencies checking freelance content need different workflow features, such as CMS or browser integrations, so filter by audience before comparing prices.
A score is not proof
No detector result is proof on its own, and our reviews note that confidence drops on short passages. For decisions with consequences, such as academic misconduct cases, combine the score with other evidence, such as drafts, version history or a conversation with the writer.
Questions about AI detectors software
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