Best Plag.ai Alternatives in 2026
Updated
20 platforms from plagiarism detection software ranked against Plag.ai on the same published basis.
- 1Plag.ai vs GPTZero
- 2Plag.ai vs Noplag
- 3Plag.ai vs Noplag Engine
- 4Plag.ai vs Originality.ai
- 5Plag.ai vs Pangram
- 6Plag.ai vs Quetext AI Detector
- 7Plag.ai vs SmallSEOTools Plagiarism Checker
- 8Plag.ai vs Winston AI
- 9Plag.ai vs Dolos
- 10Plag.ai vs JPlag
- 11Plag.ai vs Copyleaks AI Detector
- 12Plag.ai vs PlagiarismCheck.org
- 13Plag.ai vs Codeleaks
- 14Plag.ai vs DupliChecker
- 15Plag.ai vs PlagiarismDetector.net
- 16Plag.ai vs Codequiry
- 17Plag.ai vs WINNOWR
- 18Plag.ai vs Plagium
- 19Plag.ai vs Plagiarisma
- 20Plag.ai vs Plagius
Plag.ai alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | GPTZero | 7.4 | Free plan | $8.33/mo | API, Browser, Web |
| 2 | Noplag | 7.3 | Free plan | $9.99/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 3 | Noplag Engine | 7.3 | Free plan | $9.99/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 4 | Originality.ai | 7.3 | Free plan | $12.95/mo | API, Browser, Web |
| 5 | Pangram | 7.3 | Free plan | $1.67/mo | API, Browser, Web |
| 6 | Quetext AI Detector | 7.3 | Free plan | $7.99/mo | API, Browser, Web |
| 7 | SmallSEOTools Plagiarism Checker | 7.3 | Free plan | $7.84/mo | API, Browser, Web |
| 8 | Winston AI | 7.3 | Free plan | $5/mo | API, Browser, Web |
| 9 | Dolos | 7.2 | Free plan | Free | API, Linux, self-hosted, Web, Windows |
| 10 | JPlag | 7.2 | Free plan | Free | API, Linux, Mac, self-hosted, Windows |
| 11 | Copyleaks AI Detector | 7.0 | No | $1.17/mo | API, Browser, Web |
| 12 | PlagiarismCheck.org | 6.9 | No | — | API, Browser, Web |
| 13 | Codeleaks | 6.8 | No | — | API, self-hosted, Web |
| 14 | DupliChecker | 6.8 | No | $9.99/mo | API, Web |
| 15 | PlagiarismDetector.net | 6.8 | No | $9.99/mo | API, Browser, Web |
| 16 | Codequiry | 6.7 | No | €25.76/mo | API, Linux, Mac, Web, Windows |
| 17 | WINNOWR | 6.7 | No | — | API, Linux, self-hosted, Web |
| 18 | Plagium | 5.9 | Free plan | Free | Android, iOS, Web |
| 19 | Plagiarisma | 5.8 | Free plan | Free | Web, Windows |
| 20 | Plagius | 5.4 | No | $4.90/mo | Mac, Web, Windows |
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Questions about Plag.ai alternatives
What is the best alternative to Plag.ai?
GPTZero, number 1 in plagiarism detection software with a score of 7.4 out of 10. The others here: Noplag, Noplag Engine, Originality.ai and 16 more.
What is the best free alternative to Plag.ai?
GPTZero is the best-ranked alternative with a free plan. 12 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.