Best AI Plagiarism Checkers in 2026
Updated
AI plagiarism checkers give you options for reviewing documents for copied material and AI writing. Compare AI writing checks and source coverage with maximum document words and supported file formats to understand what each entry can assess. LMS integrations and API access provide criteria for fit with your existing tools, while report export, free-plan availability, and paid-from pricing help round out the comparison. Noplag, Plagium, and PlagAware are among the options shown, along with Plagiarisma and Proofademic. Weigh the listed capabilities against the documents and review workflows you need to support.
8 of 12 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 |
|---|---|---|---|---|---|---|---|
| 1 | NoplagWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | 4 of 6 | $9.99/mo | 6.6 | ||
| 2 | PlagiumWeb · Android · iPhone | Three bars | 3 of 6 | Free | 6.5 | ||
| 3 | CopyscapeWeb · Self-hosted · API | Two bars | 1 of 6 | $4.95/mo | 6.4 | ||
| 4 | PlagAwareWeb · API | Two bars | 1 of 6 | €2.99/mo | 6.4 | ||
| 5 | Plagiarism Checker XWindows | Two bars | 1 of 6 | Free | 6.4 | ||
| 6 | PlagiarismaWeb · Windows | Two bars | 2 of 6 | Free | 6.4 | ||
| 7 | ProofademicWeb · API | Two bars | 1 of 6 | $15/mo | 6.4 | ||
| 8 | SmallSEOTools Plagiarism CheckerWeb · API · Extension | Two bars | 1 of 6 | $7.84/mo | 6.4 | ||
| 9 | PrePostSEO Plagiarism CheckerWeb · Windows · Mac · Android · iPhone · API | Two bars | 5 of 6 | $0.35/mo | 5.7 | ||
| 10 | Check-PlagiarismWeb · Android · API | One bar | 2 of 6 | $4.17/mo | 5.5 | ||
| 11 | SearchEngineReports Plagiarism CheckerWeb | One bar | 1 of 6 | $1,012/mo | 5.5 | ||
| 12 | Compilatio AI DetectorWeb · API | One bar | 1 of 6 | 5.4 | |||
| 13 | Copyleaks AI DetectorWeb · API · Extension | One bar | 1 of 6 | $1.17/mo | 5.4 | ||
| 14 | DupliCheckerWeb · API | One bar | 1 of 6 | $9.99/mo | 5.4 | ||
| 15 | PlagiarismCheck.orgWeb · API · Extension | One bar | 1 of 6 | 5.4 | |||
| 16 | PlagiarismDetector.netWeb · API · Extension | One bar | 1 of 6 | $9.99/mo | 5.4 | ||
| 17 | PlagiarismSearchWeb · API · Extension | One bar | 1 of 6 | $27.95/mo | 5.4 | ||
| 18 | Scribbr Plagiarism CheckerWeb | One bar | 1 of 6 | 5.4 | |||
| 19 | Turnitin OriginalityWeb | One bar | 1 of 6 | 5.4 | |||
| 20 | Turnitin SimilarityWeb · API | One bar | 1 of 6 | 5.4 | |||
| 21 | ViperWeb | One bar | 1 of 6 | 5.4 | |||
| 22 | DrillBitWeb · Android · iPhone · API | Two bars | No | 3 of 6 | 5.2 | ||
| 23 | PlagiusWeb · Windows · Mac | Two bars | No | 3 of 6 | $4.90/mo | 5.2 | |
| 24 | iThenticateWeb · API | One bar | No | 1 of 6 | 5.0 | ||
| 25 | PlagPointerWeb | One bar | No | 1 of 6 | 5.0 |
Compare all 25 in a table
| # | App | Score | From | Free plan | Paid from | Source coverage | Maximum document words |
|---|---|---|---|---|---|---|---|
| 1 | Noplag | 6.6 | $9.99/mo | Yes | 9.99 /mo | ||
| 2 | Plagium | 6.5 | Free | Yes | web_only | ||
| 3 | Copyscape | 6.4 | $4.95/mo | Yes | |||
| 4 | PlagAware | 6.4 | €2.99/mo | Yes | |||
| 5 | Plagiarism Checker X | 6.4 | Free | Yes | |||
| 6 | Plagiarisma | 6.4 | Free | Yes | web_academic_and_publisher | ||
| 7 | Proofademic | 6.4 | $15/mo | No | |||
| 8 | SmallSEOTools Plagiarism Checker | 6.4 | $7.84/mo | Yes | 9.8 /mo | ||
| 9 | PrePostSEO Plagiarism Checker | 5.7 | $0.35/mo | Yes | 5.25 /mo | ||
| 10 | Check-Plagiarism | 5.5 | $4.17/mo | Yes | web_only | 7,000 words | |
| 11 | SearchEngineReports Plagiarism Checker | 5.5 | $1,012/mo | Yes | web_only | 5,000 words | |
| 12 | Compilatio AI Detector | 5.4 | No | ||||
| 13 | Copyleaks AI Detector | 5.4 | $1.17/mo | ||||
| 14 | DupliChecker | 5.4 | $9.99/mo | Yes | |||
| 15 | PlagiarismCheck.org | 5.4 | Yes | ||||
| 16 | PlagiarismDetector.net | 5.4 | $9.99/mo | Yes | web_only | 25,000 words | |
| 17 | PlagiarismSearch | 5.4 | $27.95/mo | Yes | |||
| 18 | Scribbr Plagiarism Checker | 5.4 | Yes | ||||
| 19 | Turnitin Originality | 5.4 | web_academic_and_publisher | ||||
| 20 | Turnitin Similarity | 5.4 | web_academic_and_publisher | ||||
| 21 | Viper | 5.4 | No | web_academic_and_publisher | |||
| 22 | DrillBit | 5.2 | No | ||||
| 23 | Plagius | 5.2 | $4.90/mo | No | web_only | ||
| 24 | iThenticate | 5.0 | No | ||||
| 25 | PlagPointer | 5.0 | No | web_and_academic | 2,500 words |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.