Best Turnitin Similarity Alternatives in 2026
Updated
20 apps from AI plagiarism checkers ranked against Turnitin Similarity on the same published basis.
- 1Turnitin Similarity vs Noplag
- 2Turnitin Similarity vs Plagium
- 3Turnitin Similarity vs Copyscape
- 4Turnitin Similarity vs PlagAware
- 5Turnitin Similarity vs Plagiarism Checker X
- 6Turnitin Similarity vs Plagiarisma
- 7Turnitin Similarity vs Proofademic
- 8Turnitin Similarity vs SmallSEOTools Plagiarism Checker
- 9Turnitin Similarity vs PrePostSEO Plagiarism Checker
- 10Turnitin Similarity vs Check-Plagiarism
- 11Turnitin Similarity vs SearchEngineReports Plagiarism Checker
- 12Turnitin Similarity vs Compilatio AI Detector
- 13Turnitin Similarity vs Copyleaks AI Detector
- 14Turnitin Similarity vs DupliChecker
- 15Turnitin Similarity vs PlagiarismCheck.org
- 16Turnitin Similarity vs PlagiarismDetector.net
- 17Turnitin Similarity vs PlagiarismSearch
- 18Turnitin Similarity vs Scribbr Plagiarism Checker
- 19Turnitin Similarity vs Turnitin Originality
- 21Turnitin Similarity vs Viper
Turnitin Similarity alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Noplag | 6.6 | Free plan | $9.99/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 2 | Plagium | 6.5 | Free plan | Free | Android, iOS, Web |
| 3 | Copyscape | 6.4 | Free plan | $4.95/mo | API, self-hosted, Web |
| 4 | PlagAware | 6.4 | Free plan | €2.99/mo | API, Web |
| 5 | Plagiarism Checker X | 6.4 | Free plan | Free | Windows |
| 6 | Plagiarisma | 6.4 | Free plan | Free | Web, Windows |
| 7 | Proofademic | 6.4 | Free plan | $15/mo | API, Web |
| 8 | SmallSEOTools Plagiarism Checker | 6.4 | Free plan | $7.84/mo | API, Browser, Web |
| 9 | PrePostSEO Plagiarism Checker | 5.7 | $0.35/mo | Android, API, iOS, Mac, Web, Windows | |
| 10 | Check-Plagiarism | 5.5 | $4.17/mo | Android, API, Web | |
| 11 | SearchEngineReports Plagiarism Checker | 5.5 | $1,012/mo | Web | |
| 12 | Compilatio AI Detector | 5.4 | API, Web | ||
| 13 | Copyleaks AI Detector | 5.4 | $1.17/mo | API, Browser, Web | |
| 14 | DupliChecker | 5.4 | $9.99/mo | API, Web | |
| 15 | PlagiarismCheck.org | 5.4 | API, Browser, Web | ||
| 16 | PlagiarismDetector.net | 5.4 | $9.99/mo | API, Browser, Web | |
| 17 | PlagiarismSearch | 5.4 | $27.95/mo | API, Browser, Web | |
| 18 | Scribbr Plagiarism Checker | 5.4 | Web | ||
| 19 | Turnitin Originality | 5.4 | Web | ||
| 21 | Viper | 5.4 | Web |
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Questions about Turnitin Similarity alternatives
What is the best alternative to Turnitin Similarity?
Noplag, number 1 in AI plagiarism checkers with a score of 6.6 out of 10. The others here: Plagium, Copyscape, PlagAware and 16 more.
What is the best free alternative to Turnitin Similarity?
Noplag is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.