Best Copyscape Alternatives in 2026
Updated
20 tools from plagiarism checkers ranked against Copyscape on the same published basis.
- 1Copyscape vs Noplag
- 2Copyscape vs PlagAware
- 3Copyscape vs PrePostSEO Plagiarism Checker
- 5Copyscape vs Plagius
- 6Copyscape vs Copyleaks AI Detector
- 7Copyscape vs Dolos
- 8Copyscape vs PlagiarismSearch
- 9Copyscape vs Quetext AI Detector
- 10Copyscape vs SmallSEOTools Plagiarism Checker
- 11Copyscape vs Originality.ai
- 12Copyscape vs Plagiarism Checker X
- 13Copyscape vs Plagiarisma
- 14Copyscape vs Smodin Plagiarism Checker
- 15Copyscape vs PlagiarismCheck.org
- 16Copyscape vs DupliChecker
- 17Copyscape vs Scribbr Plagiarism Checker
- 18Copyscape vs Viper
- 19Copyscape vs MOSS
- 20Copyscape vs Red Paper
- 21Copyscape vs Plagramme
Copyscape alternatives compared
| # | Tool | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Noplag | 7.9 | Free plan | $9.99/mo | API, Linux, Mac, self-hosted, Web, Windows |
| 2 | PlagAware | 7.4 | Free plan | €2.99/mo | API, Web |
| 3 | PrePostSEO Plagiarism Checker | 7.4 | No | $0.35/mo | Android, API, iOS, Mac, Web, Windows |
| 5 | Plagius | 7.1 | No | $4.90/mo | Mac, Web, Windows |
| 6 | Copyleaks AI Detector | 7.0 | No | $1.17/mo | API, Browser, Web |
| 7 | Dolos | 7.0 | Free plan | Free | API, Linux, self-hosted, Web, Windows |
| 8 | PlagiarismSearch | 7.0 | No | $27.95/mo | API, Browser, Web |
| 9 | Quetext AI Detector | 7.0 | Free plan | $7.99/mo | API, Browser, Web |
| 10 | SmallSEOTools Plagiarism Checker | 7.0 | Free plan | $7.84/mo | API, Browser, Web |
| 11 | Originality.ai | 6.9 | Free plan | $12.95/mo | API, Browser, Web |
| 12 | Plagiarism Checker X | 6.9 | Free plan | Free | Windows |
| 13 | Plagiarisma | 6.9 | Free plan | Free | Web, Windows |
| 14 | Smodin Plagiarism Checker | 6.9 | No | $10/mo | Android, API, Browser, iOS, Web |
| 15 | PlagiarismCheck.org | 6.6 | No | — | API, Browser, Web |
| 16 | DupliChecker | 6.5 | No | $9.99/mo | API, Web |
| 17 | Scribbr Plagiarism Checker | 6.5 | No | — | Web |
| 18 | Viper | 6.4 | No | — | Web |
| 19 | MOSS | 6.0 | Free plan | Free | Linux, Web |
| 20 | Red Paper | 6.0 | No | — | Web |
| 21 | Plagramme | 5.9 | No | — | Web |
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Questions about Copyscape alternatives
What is the best alternative to Copyscape?
Noplag, number 1 in plagiarism checkers with a score of 7.9 out of 10. The others here: PlagAware, PrePostSEO Plagiarism Checker, Plagius and 16 more.
What is the best free alternative to Copyscape?
Noplag is the best-ranked alternative with a free plan. 9 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, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.