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Copyleaks API
Content-integrity API for AI detection and plagiarism scanning, billed in unified credits per scan.
Humanizer APIs from USD 13.99
Humanizer APIs
Products where the developer API is a first-class offering: documented endpoints, per-word or per-credit pricing, rate limits you can plan around. Relevant if you are putting a humanizer or detector inside your own product.
| Tools in this category | 8 |
|---|---|
| With a price read at the source | 7 |
| With a free tier | 1 |
| Reviewed hands-on | 0 |
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Originality.AI API
AI detection and plagiarism API billed in credits, where one credit covers 100 words of scanned text.
Humanizer APIs from USD 12.95
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Sapling AI Detector API
Metered NLP API with AI detection, rephrase and grammar endpoints priced per 1,000 characters.
Humanizer APIs from USD 5.00
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StealthGPT API
Pay-as-you-go rewriting API priced per 1,000 words, with tiered invoice limits and documented rate limits.
Humanizer APIs from USD 0.20
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Undetectable AI API
Developer API for text humanization and AI detection, billed from the same word-credit balance as the web app.
Humanizer APIs from USD 9.99
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Winston AI API
Credit-based API for AI text, image and plagiarism detection, with a starter kit and REST reference docs.
Humanizer APIs from USD 10.00
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WriteHuman API
REST humanizer API with /v1/humanize and /v1/detect endpoints and word-based monthly billing.
Humanizer APIs from USD 29.00
Listed API New
GPTZero API
AI detection API exposing the same document, sentence and paragraph scores used by the GPTZero web app.
Humanizer APIs Freemium