Best AI Plagiarism Checkers in 2026
Updated
Reviewing a document for plagiarism means considering both what a checker can examine and how its results fit your process. Compared on AI writing checks and source coverage, the entries also specify maximum document words and supported file formats. Report export may matter when you need to share findings; LMS integrations and API access can help you assess workflow compatibility. Check free-plan availability and paid-from pricing too. Noplag, PlagAware, and Proofademic are among the entries shown, as are Plagium and Copyleaks AI Detector. Weigh the listed coverage and document limits against the materials you review, then consider the integrations and report options you need.
26ranked
8free plans on this page
$0.35/molowest paid tier
8 Oct 2026last checked
AI Plagiarism Checkers, ranked on how quickly a newcomer can get going.13 of 13 products with recorded free access can be tried for free.
- 1 NoplagPaid from $9.99/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 PlagAwarePaid from €2.99/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 3 CopyscapePaid from $4.95/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 4 ProofademicPaid from $15/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 5 PlagiumFree plan
- Free to practise on: yes
- Well documented: yes
- Runs where you work: yes
- 6 Compilatio AI Detector
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 7 Copyleaks AI DetectorPaid from $1.17/mo
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 8 Plagiarism Checker XFree plan
- Free to practise on: yes
- Well documented: yes
- Runs where you work: no
- 9 PlagiarismaFree plan
- Free to practise on: yes
- Well documented: yes
- Runs where you work: no
- 10 PlagiarismSearchPaid from $27.95/mo
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 11 PlagiusPaid from $4.90/mo
- Free to practise on: no
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 12 SmallSEOTools Plagiarism CheckerPaid from $7.84/mo
- Free to practise on: yes
- Well documented: yes
- Runs where you work: no
- 13 PrePostSEO Plagiarism CheckerPaid from $0.35/mo
- Well documented: yes
- Runs where you work: yes
- 14 Check-PlagiarismPaid from $4.17/mo
- Well documented: yes
- Runs where you work: no
- 15 StrikePlagiarism
- Free to practise on: no
- Free trial: yes
- Well documented: yes
- Runs where you work: no
- 16 SearchEngineReports Plagiarism CheckerPaid from $1,012/mo
- Well documented: yes
- Runs where you work: no
- 17 DrillBit
- Free to practise on: no
- Well documented: yes
- Runs where you work: yes
- 18 PlagiarismCheck.org
- Well documented: yes
- Runs where you work: no
- 19 DupliCheckerPaid from $9.99/mo
- Well documented: yes
- Runs where you work: no
- 20 Scribbr Plagiarism Checker
- Well documented: yes
- Runs where you work: no
- 21 Turnitin Originality
- Well documented: yes
- Runs where you work: no
- 22 Turnitin Similarity
- Well documented: yes
- Runs where you work: no
- 23 Viper
- Free trial: no
- Well documented: yes
- Runs where you work: no
- 24 PlagiarismDetector.netPaid from $9.99/mo
- Free trial: no
- Well documented: yes
- Runs where you work: no
- 25 iThenticate
- Free to practise on: no
- Well documented: yes
- Runs where you work: no
Compare all 25 in a table
| # | Platform | Score | From | Free plan | Paid from | Source coverage | Maximum document words |
|---|---|---|---|---|---|---|---|
| 1 | Noplag | 7.9 | $9.99/mo | Yes | 9.99 /mo | ||
| 2 | PlagAware | 7.7 | €2.99/mo | Yes | |||
| 3 | Copyscape | 7.6 | $4.95/mo | Yes | |||
| 4 | Proofademic | 7.5 | $15/mo | No | |||
| 5 | Plagium | 7.2 | Free | Yes | web_only | ||
| 6 | Compilatio AI Detector | 7.0 | No | ||||
| 7 | Copyleaks AI Detector | 7.0 | $1.17/mo | ||||
| 8 | Plagiarism Checker X | 7.0 | Free | Yes | |||
| 9 | Plagiarisma | 7.0 | Free | Yes | web_academic_and_publisher | ||
| 10 | PlagiarismSearch | 7.0 | $27.95/mo | Yes | |||
| 11 | Plagius | 7.0 | $4.90/mo | No | web_only | ||
| 12 | SmallSEOTools Plagiarism Checker | 7.0 | $7.84/mo | Yes | 9.8 /mo | ||
| 13 | PrePostSEO Plagiarism Checker | 6.8 | $0.35/mo | Yes | 5.25 /mo | ||
| 14 | Check-Plagiarism | 6.6 | $4.17/mo | Yes | web_only | 7,000 words | |
| 15 | StrikePlagiarism | 6.6 | No | ||||
| 16 | SearchEngineReports Plagiarism Checker | 6.5 | $1,012/mo | Yes | web_only | 5,000 words | |
| 17 | DrillBit | 6.4 | No | ||||
| 18 | PlagiarismCheck.org | 6.4 | Yes | ||||
| 19 | DupliChecker | 6.3 | $9.99/mo | Yes | |||
| 20 | Scribbr Plagiarism Checker | 6.3 | Yes | ||||
| 21 | Turnitin Originality | 6.3 | web_academic_and_publisher | ||||
| 22 | Turnitin Similarity | 6.2 | web_academic_and_publisher | ||||
| 23 | Viper | 6.2 | No | web_academic_and_publisher | |||
| 24 | PlagiarismDetector.net | 6.1 | $9.99/mo | Yes | web_only | 25,000 words | |
| 25 | iThenticate | 6.0 | No |
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