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AI Detectors.io combines sentence-level text analysis with confidence scores and an overall AI probability for text associated with major language models. Its other tools include a humanizer, citation verification, plagiarism checking, grammar tools, and watermark removal. It runs on the web, Windows, and macOS, with an extension and API for other workflows. The free plan allows 10,000 words per month; Premium costs $8.33 per month when billed annually. Detection is trained and benchmarked on English, and the company says other languages are outside that benchmark.

1. 1

   TrustOriginality.ai

   Free plan AndroidAPIExtension+3

   Multimedia checks with signed, verifiable review reports — TrustOriginality.ai analyzes text, images, audio, and video and can issue signed PDF reports with QR verification and public links.

   6.9 Free plan · paid from €4.99/mo Visit site
2. 2

   ContentDetector.org

   Free plan ExtensioniPhoneMac+2

   Free checks from pasted text, files, URLs, or bulk lists — ContentDetector.org accepts pasted text, files, or URLs and supports folder or URL-list bulk checks, while AI Detectors.io offers additional writing tools and API scoring.

   7.5 Free plan Visit site
3. 3

   GPTZero

   Free plan APIExtensionWeb

   Document, sentence, and word-level AI highlights — GPTZero highlights AI use at document, sentence, and word level and adds Writing Replay, writing feedback, and plagiarism checking.

   7.1 Free plan · 14-day trial Visit site
4. 4

   It's AI

   Free plan APIExtensionWeb

   Education workflows and broad integrations — It's AI offers Deep Scan sentence highlights, a word heatmap, and integrations including Canvas LMS, ChatGPT Plugin, and Zapier.

   7.1 Free plan · paid from $7/mo (annual) Visit site
5. 5

   Originality.ai

   Free plan APIExtensionWeb

   Website-wide scanning and configurable AI allowances — Originality.ai can crawl and schedule whole-site scans, set AI allowances, and scan Moodle submissions for AI text and plagiarism.

   7.0 Free plan · paid from $12.95/mo (annual) Visit site
6. 6

   Winston AI

   Free plan APIExtensionSelf-hosted+1

   Text and image checks with OCR and downloadable reports — Winston AI detects text and images, uses OCR on scans, pictures, and handwriting, and provides downloadable reports.

   6.9 From $10/mo (annual) · 14-day trial Visit site
7. 7

   AI Detector Pro

   Free plan AndroidAPIMac+2

   Revising detector-flagged English text — AI Detector Pro highlights likely detector-triggering text and offers an English-focused AI Eraser with adjustable wording changes.

   7.7 Free plan Visit site
8. 8

   Copyleaks AI Detector

   Free plan APIExtensionSelf-hosted+1
   7.5 Visit site
9. 9

   AI-Content Detector ML

   Free plan ExtensionWeb
   7.4 Free plan Visit site
10. 10 A

    Airno

    Free plan APIWeb
    7.3 Free plan Visit site
11. 11

    Detecting-AI.com

    Free plan APIWeb
    7.1 Free plan · paid from $7/mo (annual) Visit site
12. 12

    Detecto

    Free plan Web
    7.0 Free plan · paid from $6.99/mo (annual) Visit site
13. 13

    GPTKit

    Free plan APIWeb
    7.0 Free plan Visit site
14. 14

    EyeSift

    Free plan Web
    6.9 Free plan Visit site
15. 15

    Isgen AI Detector

    Free plan APIWeb
    6.9 Free plan · paid from $8/mo (annual) Visit site
16. 16

    Pangram

    Free plan APIExtensionWeb
    6.9 Free plan · paid from $20/mo · 7-day trial Visit site
17. 17 L

    Learnaway

    Free plan Web
    6.7 Free plan · paid from £399/yr Visit site
18. 18

    Mask AI Detector

    Free plan Web
    6.7 From $10.99/mo (annual) · 7-day trial Visit site
19. 19 P

    Proofademic

    Free plan APIWeb
    6.7 3-day trial Visit site
20. 20

    Smodin AI Detector

    Free plan ExtensionWeb
    6.7 From $10/mo (annual) Visit site
21. 21

    ClassGuard

    Free trial Web
    6.0 60-day trial Visit site
22. 22

    Content Checker by AI Aware

    Free trial Web
    5.7 Pricing on request Visit site
23. 23 E

    Elucida

    Paid Web
    5.3 Pricing on request Visit site
24. 24

    TheChecker.AI

    Paid APIExtensionWeb
    5.2 From $9.90/mo Visit site

You may want another service if you need to assess images, audio, or video, document evidence, connect to an LMS, or use a different input workflow. AI Detectors.io has no LMS integrations, and submitted text may be processed by third-party AI and infrastructure providers. Compare the kind of content you need to review, how results are explained or documented, language coverage, integrations, and price. Also consider whether an alternative’s writing or review tools add value beyond AI detection.

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