Docs checked New Free
Ahrefs AI Content Detector
Free no-signup AI content detector for short text, part of Ahrefs' free SEO writing tools.
AI Detectors from USD 0.00
The best AI detectors
Detectors ranked by what we could verify about them, not by the accuracy number on their own home page.
Read this before the list
Every detector produces false positives on genuine human writing, and none of the accuracy figures on this page has been independently audited. A detector result is evidence to look into, never proof on its own.
| # | Tool | Level | Price | Free tier |
|---|---|---|---|---|
| 1 | Ahrefs AI Content Detector Free no-signup AI content detector for short text, part of Ahrefs' free SEO writing tools. | Docs checked | USD 0.00 | Yes |
| 2 | Copyleaks AI Content Detector Enterprise AI and plagiarism detection in one report, with LMS integrations and 30+ language support. | Docs checked API | USD 13.99 | Yes |
| 3 | Crossplag AI Content Detector Free English-only AI content detector offered alongside Crossplag's cross-language plagiarism checker. | Docs checked | USD 0.00 | Yes |
| 4 | Decopy AI Detector Free no-login AI detector handling up to 200,000 characters with shareable online or PDF reports. | Docs checked | USD 9.99 | Yes |
| 5 | Detecting-AI Free AI detector taking 15,000 characters per scan without signup, plus detector and humanizer APIs. | Docs checked API | USD 7.00 | Yes |
| 6 | Grammarly AI Detector Free AI detector from Grammarly returning a percentage AI score, with a Pro agent for flagged phrases. | Docs checked | USD 12.00 | Yes |
| 7 | Isgen Multilingual AI detector with sentence-level highlighting, bulk scanning and an academic-priced plan. | Docs checked API | USD 8.00 | Yes |
| 8 | Originality.ai AI detection plus plagiarism, fact and readability checks aimed at web publishers and content agencies. | Docs checked API | USD 12.95 | 2000 words |
| 9 | Pangram Labs Research-led AI text detector for schools and platforms, with a free daily quota and a usage-based API. | Docs checked API | USD 20.00 | 2000 words |
| 10 | QuillBot AI Detector Free AI detector inside QuillBot's writing suite, with sentence highlights and a 1,200-word free scan. | Docs checked | USD 8.33 | 1200 words |
| 11 | Sapling AI Content Detector Free AI content detector with sentence-level scores, a Chrome extension and a metered developer API. | Docs checked API | USD 12.00 | Yes |
| 12 | Scribbr AI Detector Free student-facing AI detector with paragraph-level feedback and a paid premium GPT-4-capable tier. | Docs checked | USD 19.95 | 1200 words |
| 13 | Undetectable.ai AI Detector Free no-signup detector that aggregates results from several third-party AI detection models at once. | Docs checked API | USD 5.00 | Yes |
| 14 | Walter Writes AI Detector AI detector bundled with Walter Writes' humanizer, scoring text on perplexity, burstiness and flow. | Docs checked | USD 8.00 | Yes |
| 15 | Winston AI AI text, image and deepfake detection with plagiarism checking and site certification for publishers. | Docs checked API | USD 10.00 | 2000 words |
Docs checked API New
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
Docs checked New Free
Crossplag AI Content Detector
Free English-only AI content detector offered alongside Crossplag's cross-language plagiarism checker.
AI Detectors from USD 0.00
Docs checked New
Decopy AI Detector
Free no-login AI detector handling up to 200,000 characters with shareable online or PDF reports.
AI Detectors from USD 9.99
Docs checked API New
Detecting-AI
Free AI detector taking 15,000 characters per scan without signup, plus detector and humanizer APIs.
AI Detectors from USD 7.00
Docs checked New
Grammarly AI Detector
Free AI detector from Grammarly returning a percentage AI score, with a Pro agent for flagged phrases.
AI Detectors from USD 12.00
Docs checked API New
Isgen
Multilingual AI detector with sentence-level highlighting, bulk scanning and an academic-priced plan.
AI Detectors from USD 8.00
Docs checked API New
Originality.ai
AI detection plus plagiarism, fact and readability checks aimed at web publishers and content agencies.
AI Detectors from USD 12.95
Docs checked API New
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
Docs checked New
QuillBot AI Detector
Free AI detector inside QuillBot's writing suite, with sentence highlights and a 1,200-word free scan.
AI Detectors from USD 8.33
Docs checked API New
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
Docs checked New
Scribbr AI Detector
Free student-facing AI detector with paragraph-level feedback and a paid premium GPT-4-capable tier.
AI Detectors from USD 19.95
Docs checked API New
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
Docs checked New
Walter Writes AI Detector
AI detector bundled with Walter Writes' humanizer, scoring text on perplexity, burstiness and flow.
AI Detectors from USD 8.00
Docs checked API New
Winston AI
AI text, image and deepfake detection with plagiarism checking and site certification for publishers.
AI Detectors from USD 10.00