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Phrasly
Humanizes AI text and bundles an AI detector, plagiarism checker and content generator.
Academic & Student Tools from USD 10.99
Tools with a documented API
Humanizers and detectors you can call from your own product, with published endpoints.
What has to be true to appear here
The vendor publishes developer documentation with endpoints and a pricing unit you can plan around.
59 tools meet this criterion.
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CudekAI
Credit-based undetectable AI humanizer bundled with AI text, image and video detectors and a plagiarism checker.
AI Detector Bypassers from USD 6.00
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GPTHuman AI
AI humanizer with per-output word caps, watermark removal for ChatGPT and Claude, and a humanizer API.
AI Detector Bypassers from USD 8.25
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HIX Bypass
Rewrites AI text in Fast, Aggressive or Latest mode and scores it with a bundled AI detector.
AI Detector Bypassers from USD 14.99
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Rephrasy
AI humanizer with day-pass, subscription and lifetime plans, plus humanizer and AI detector APIs.
AI Detector Bypassers from USD 8.25
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StealthGPT
Rewrites AI text and auto-types the result into web fields via a Chrome extension.
AI Detector Bypassers from USD 30.00
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WriteHuman
Rewrites AI text into human-style output with multiple variations per request and AI detection checks.
AI Detector Bypassers from USD 20.00
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Copyleaks AI Content Detector
Enterprise AI and plagiarism detection in one report, with LMS integrations and 30+ language support.
AI Detectors from USD 13.99
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Detecting-AI
Free AI detector taking 15,000 characters per scan without signup, plus detector and humanizer APIs.
AI Detectors from USD 7.00
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Isgen
Multilingual AI detector with sentence-level highlighting, bulk scanning and an academic-priced plan.
AI Detectors from USD 8.00
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Originality.ai
AI detection plus plagiarism, fact and readability checks aimed at web publishers and content agencies.
AI Detectors from USD 12.95
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Pangram Labs
Research-led AI text detector for schools and platforms, with a free daily quota and a usage-based API.
AI Detectors from USD 20.00
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Sapling AI Content Detector
Free AI content detector with sentence-level scores, a Chrome extension and a metered developer API.
AI Detectors from USD 12.00
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Undetectable.ai AI Detector
Free no-signup detector that aggregates results from several third-party AI detection models at once.
AI Detectors from USD 5.00
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Winston AI
AI text, image and deepfake detection with plagiarism checking and site certification for publishers.
AI Detectors from USD 10.00
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AIHumanize.io
Rewrites AI text in several styles, locks keywords and citations, and runs AI detection checks.
AI Humanizers from USD 15.00
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Hastewire
Humanizes AI drafts and adds sentence-level AI detection, grammar checking and translation.
AI Humanizers from USD 5.00
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Humanize AI
Web tool that converts AI-generated text into human-style writing, with a free unlimited tier.
AI Humanizers from USD 12.00
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Ryne AI
Humanizes AI text and adds an AI detector, essay writer and lecture note tools.
AI Humanizers from USD 19.99
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SupWriter
Humanizes AI text and adds paraphrasing, grammar checking and AI detection.
AI Humanizers from USD 4.99
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Undetectable AI
Rewrites AI-generated text into human-style output and includes a built-in AI detector.
AI Humanizers from USD 9.99
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Walter Writes AI
Humanizes AI drafts, removes model watermarks and scores output with a built-in detector.
AI Humanizers from USD 8.00
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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
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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
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AI Undetect
Rewrites AI-generated content into human-style text and includes an AI detector.
Multilingual Humanizers from USD 5.00
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Paraphraser.io
Online paraphrasing tool with five rewrite modes and a 600-word free limit per submission.
Paraphrasers & Rewriters from USD 4.55
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Prepostseo Paraphrasing Tool
Paraphrasing tool inside Prepostseo's SEO toolkit, sold as its own plan alongside a humanizer.
Paraphrasers & Rewriters from USD 6.75
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Copyscape
Duplicate content search that finds copies of a web page or text elsewhere online.
Plagiarism & Originality Checkers from USD 0.03
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DupliChecker
Free web-based plagiarism checker with paid search-and-word packages and API access.
Plagiarism & Originality Checkers from USD 9.99
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Plagiarism Detector
Online plagiarism checker with a free tier, paid word packages and a developer API.
Plagiarism & Originality Checkers from USD 20.00
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Quetext
DeepSearch plagiarism checker with AI detection, citation assistant and bulk uploads.
Plagiarism & Originality Checkers from USD 14.99
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Arvow (formerly Journalist AI)
Autoblogging and site-optimization platform for SEO teams, billed in monthly credits with API access.
SEO & Marketing Content from USD 39.00
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Surfer AI Humanizer
Free rewriting tool inside Surfer's SEO content platform that reworks AI drafts before optimization.
SEO & Marketing Content from USD 49.00
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Copy.ai
GTM AI platform for marketing copy and workflows that publishes its own Free AI Humanizer.
Writing Assistants with a Humanize Mode from USD 24.00
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Koala AI
SEO article writer and chatbot that ships a free AI-to-human text converter among its tools.
Writing Assistants with a Humanize Mode from USD 20.00
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Surfer
SEO content editor and AI writer that offers a free AI Humanizer for AI-generated drafts.
Writing Assistants with a Humanize Mode from USD 49.00
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TextCortex
AI writing assistant and browser copilot with a Humanize AI Text template and public API.
Writing Assistants with a Humanize Mode from USD 29.99
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Writesonic
AI content and search-visibility platform that includes a documented AI Text Humanizer.
Writing Assistants with a Humanize Mode from USD 79.00
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GPTZero
AI text detector for educators and publishers with sentence-level highlighting and batch file scanning.
AI Detectors Freemium
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ZeroGPT
Free web AI text detector with highlighted sentences, plus paraphraser, summarizer and API plans.
AI Detectors Freemium
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Humbot
Humanizes AI text in three modes and checks the result with an integrated AI detector.
AI Humanizers Freemium
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Honorlock
Online exam proctoring for universities, corporate training and credentialing bodies.
Detection Suites for Institutions Price on request
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Proctorio
Automated remote proctoring and exam security for K-12, higher education and credentialing.
Detection Suites for Institutions Price on request
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Turnitin Feedback Studio
Institutional integrity and grading suite combining similarity reports with feedback tools.
Detection Suites for Institutions Price on request
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Turnitin Similarity
Similarity checking that compares submissions against student papers, publications and web content.
Plagiarism & Originality Checkers Price on request
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Bypass AI
AI detection remover with Simple, Standard and Enhanced modes plus a built-in multi-engine AI detector.
AI Detector Bypassers Freemium
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BypassGPT
Humanizer with Fast, Creative and Enhanced modes that rewrites AI text to pass AI detectors; includes a detector.
AI Detector Bypassers Freemium
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Smodin AI Detection Remover
Smodin module that rewrites AI-generated text to pass AI detectors, with AI Extra and Plagiarism modes.
AI Detector Bypassers Freemium
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Hive AI-Generated Content Detection
Enterprise moderation APIs that classify text, image, video and audio as AI-generated with confidence scores.
AI Detectors Paid
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Smodin AI Content Detector
AI content detector inside Smodin's writing suite, covering 100+ languages with file upload support.
AI Detectors Freemium
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GPTZero API
AI detection API exposing the same document, sentence and paragraph scores used by the GPTZero web app.
Humanizer APIs Freemium
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GPTZero for Education
AI writing detection for schools, with LMS scanning and institution-level analytics dashboards.
Detection Suites for Institutions Price on request
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ZeroGPT AI Humanizer
Free no-signup humanizer offered in English, French, German, Spanish, Italian and Portuguese.
Listed API New
PlagiarismCheck.org
Plagiarism and AI detection for individuals and organizations, with LMS add-ons and an API.
Plagiarism & Originality Checkers Price on request