Best Turnitin Similarity Alternatives in 2026
Updated
20 platforms from AI plagiarism checkers ranked against Turnitin Similarity on the same published basis.
- 1Turnitin Similarity vs PlagAware
- 2Turnitin Similarity vs Copyscape
- 3Turnitin Similarity vs Noplag
- 4Turnitin Similarity vs Proofademic
- 5Turnitin Similarity vs SmallSEOTools Plagiarism Checker
- 6Turnitin Similarity vs Check-Plagiarism
- 7Turnitin Similarity vs Compilatio AI Detector
- 8Turnitin Similarity vs Copyleaks AI Detector
- 9Turnitin Similarity vs PrePostSEO Plagiarism Checker
- 10Turnitin Similarity vs PlagiarismCheck.org
- 11Turnitin Similarity vs PlagiarismDetector.net
- 12Turnitin Similarity vs PlagiarismSearch
- 13Turnitin Similarity vs DrillBit
- 14Turnitin Similarity vs DupliChecker
- 16Turnitin Similarity vs iThenticate
- 17Turnitin Similarity vs StrikePlagiarism
- 18Turnitin Similarity vs Plagiarism Checker X
- 19Turnitin Similarity vs Plagium
- 20Turnitin Similarity vs Plagiarisma
- 21Turnitin Similarity vs SearchEngineReports Plagiarism Checker
Turnitin Similarity alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | PlagAware | 7.4 | Free plan | €2.99/mo | API, Web |
| 2 | Copyscape | 7.3 | Free plan | $4.95/mo | API, self-hosted, Web |
| 3 | Noplag | 7.3 | Free plan | $9.99/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 4 | Proofademic | 7.3 | Free plan | $15/mo | API, Web |
| 5 | SmallSEOTools Plagiarism Checker | 7.3 | Free plan | $7.84/mo | API, Browser, Web |
| 6 | Check-Plagiarism | 7.0 | $4.17/mo | Android, API, Web | |
| 7 | Compilatio AI Detector | 7.0 | API, Web | ||
| 8 | Copyleaks AI Detector | 7.0 | $1.17/mo | API, Browser, Web | |
| 9 | PrePostSEO Plagiarism Checker | 7.0 | $0.35/mo | Android, API, iOS, Mac, Web, Windows | |
| 10 | PlagiarismCheck.org | 6.9 | API, Browser, Web | ||
| 11 | PlagiarismDetector.net | 6.9 | $9.99/mo | API, Browser, Web | |
| 12 | PlagiarismSearch | 6.9 | $27.95/mo | API, Browser, Web | |
| 13 | DrillBit | 6.8 | No | Android, API, iOS, Web | |
| 14 | DupliChecker | 6.8 | $9.99/mo | API, Web | |
| 16 | iThenticate | 6.7 | No | API, Web | |
| 17 | StrikePlagiarism | 6.7 | No | API, self-hosted, Web | |
| 18 | Plagiarism Checker X | 5.9 | Free plan | Free | Windows |
| 19 | Plagium | 5.9 | Free plan | Free | Android, iOS, Web |
| 20 | Plagiarisma | 5.8 | Free plan | Free | Web, Windows |
| 21 | SearchEngineReports Plagiarism Checker | 5.6 | $1,012/mo | Web |
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Questions about Turnitin Similarity alternatives
What is the best alternative to Turnitin Similarity?
PlagAware, number 1 in AI plagiarism checkers with a score of 7.4 out of 10. The others here: Copyscape, Noplag, Proofademic and 16 more.
What is the best free alternative to Turnitin Similarity?
PlagAware 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 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.