Best Plagiarism Checkers in 2026
Updated
31ranked
0free plans on this page
$4.90/molowest paid tier
11 Oct 2026last checked
0 of 4 with known pricing have a free tier;0 apps show full bars: free, open, on most devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 26 | PlagiusWeb · Windows · Mac | Two bars | No | 3 of 6 | $4.90/mo | 5.2 | |
| 27 | Red PaperWeb | No signal | 1 of 6 | 5.2 | |||
| 28 | iThenticateWeb · API | One bar | No | 1 of 6 | 5.0 | ||
| 29 | Plagiat.plWeb | One bar | No | 1 of 6 | 5.0 | ||
| 30 | StrikePlagiarismWeb · Self-hosted · API | One bar | No | 1 of 6 | 5.0 | ||
| 31 | Turnitin AI Writing DetectionWeb | One bar | 1 of 6 | 5.0 |
Compare all 6 in a table
| # | App | Score | Free plan | Free plan | Paid from | Web source matching | Academic source matching |
|---|---|---|---|---|---|---|---|
| 26 | Plagius | 5.2 | No | No | |||
| 27 | Red Paper | 5.2 | Yes | Yes | |||
| 28 | iThenticate | 5.0 | No | No | Yes | Yes | |
| 29 | Plagiat.pl | 5.0 | No | No | Yes | Yes | |
| 30 | StrikePlagiarism | 5.0 | No | No | Yes | Yes | |
| 31 | Turnitin AI Writing Detection | 5.0 | No | Yes | Yes |