The Best Plagiarism Checkers in 2026
We researched plagiarism checkers from official websites, including pricing pages, plan tables and product documentation. Rankings reflect each tool’s source-matching capabilities, value for money and verified features for different buyers and workflows.
Our top picks
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Top ranked
Turnitin AI Writing Detection#1 of 319.4/10A focused institutional tool for identifying text that may be AI-generated or modified.
Pricing on request
-
Runner-up
Crossref Similarity Check#2 of 319.2/10A focused manuscript-screening service with academic matching, reports, filters, and API access.
-
Top-ranked free plan
Copyscape#4 of 318.9/10A web-focused plagiarism checker with batch searches, private indexing, and API automation.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 31 tools, best first
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Best forInstitutions focused on AI-writing detection
A focused institutional tool for identifying text that may be AI-generated or modified.
- LMS integration
- Academic source matching
- Web source matching
9.4/10★★★★★Visit Turnitin -
Best forPublishers and journals checking manuscripts
A focused manuscript-screening service with academic matching, reports, filters, and API access.
- Academic source matching
- Web source matching
- API access
9.2/10★★★★★Visit Crossref -
Best forResearchers and publishers needing private-repository checks
A paid similarity checker built for researchers, publishers, and private repositories.
- LMS integration
- Academic source matching
- Web source matching
9.0/10★★★★☆Visit iThenticate -
Best forWeb publishers and teams checking site content
A web-focused plagiarism checker with batch searches, private indexing, and API automation.
- Web source matching
- API access
8.9/10★★★★☆Visit Copyscape -
Best forFree source-code checks across many languages
A free code-similarity checker for programming courses, not web or academic-document plagiarism.
8.8/10★★★★☆Visit MOSS -
Best forAcademic institutions needing broad, deep checking
A broad academic checker with deep source coverage, workflow tools, and API access.
- LMS integration
- Academic source matching
- Web source matching
8.7/10★★★★☆Try StrikePlagiarism -
Best forSchools needing bulk workflows and automation
A page-credit plagiarism checker with AI, academic matching, and school workflows.
- LMS integration
- Academic source matching
- Web source matching
8.6/10★★★★☆Visit DrillBit -
Best forSchools wanting affordable, feature-rich checking
A flexible checker with academic matching, authorship verification, reports, APIs, and LMS integrations.
- LMS integration
- Academic source matching
- Web source matching
8.5/10★★★★☆Visit site -
Best forSelf-hosters needing open-source flexibility
An open-source checker with self-hosting, academic matching, APIs, and LMS integrations.
- LMS integration
- Academic source matching
- Web source matching
8.4/10★★★★☆Visit Noplag -
Best forUsers combining AI detection with basic plagiarism checks
A practical hybrid for sentence-level AI detection and basic plagiarism checking.
- LMS integration
- Academic source matching
- Web source matching
8.3/10★★★★☆Visit Quetext -
Best forTeams prioritizing AI and high-volume scanning
A broad AI and plagiarism checker for multilingual, high-volume scanning.
- API access
8.2/10★★★★☆Visit Copyleaks -
Best forContent teams combining plagiarism and AI checks
A broad verification platform for teams that need plagiarism and AI detection together.
- API access
8.1/10★★★★☆Visit Originality.ai -
Best forWriters needing simple low-cost web checking
A low-cost web checker with broad matching tools, but limited to 1,000 words per free check.
- LMS integration
- Academic source matching
- Web source matching
8.0/10★★★★☆Visit SmallSEOTools -
Best forMobile users needing broad file and language support
A broad, mobile-friendly checker with online matching, uploads, reports, and API access.
- Web source matching
- API access
7.9/10★★★★☆Visit PrePostSEO -
Best forUsers wanting plagiarism plus AI writing tools
A broad originality checker with AI writing tools, but no free plan or LMS support.
- Academic source matching
- Web source matching
- API access
7.8/10★★★★☆Visit Smodin -
Best forCasual users wanting free multilingual checks
A broad web checker for casual multilingual originality reviews, with a 1,000-word free limit.
- Academic source matching
- Web source matching
- API access
7.7/10★★★★☆Visit DupliChecker -
Best forStudents wanting polished one-time reports
A strong fit for one-time academic checks, with detailed reports available per document.
- Academic source matching
- Web source matching
7.6/10★★★★☆Visit Scribbr -
Best forInstitutions needing multilingual and OCR analysis
A broad institutional checker for similarity, rephrasing, translation, OCR, and AI signals.
- LMS integration
- Academic source matching
- Web source matching
7.5/10★★★★☆Visit Compilatio -
Best forAcademic users needing low-cost token checks
Low-cost token checks with broad academic sources and institutional integrations.
- LMS integration
- Academic source matching
- Web source matching
7.4/10★★★★☆Visit Plagiat.pl -
Best forBudget-conscious users needing recurring checks
A low-cost checker with recurring scans, monitoring, reports, API access and Moodle integration.
- LMS integration
- Academic source matching
- Web source matching
7.3/10★★★★☆Visit PlagAware -
Best forUsers wanting flexible reports and filtering
Flexible source coverage, reports, filters, and integrations with a low-cost paid entry point.
- LMS integration
- Academic source matching
- Web source matching
7.2/10★★★★☆Try PlagiarismSearch -
Best forStudents wanting paraphrase and citation analysis
A web-based checker for similarity, paraphrase, citation, and translated plagiarism.
- Academic source matching
- Web source matching
7.1/10★★★★☆Visit Plag -
Best forStudents needing downloadable academic reports
A broad web-based checker for students who need downloadable academic reports.
- Academic source matching
- Web source matching
7.0/10★★★★☆Visit Plagramme -
Best forUsers needing multilingual one-off scans
A flexible pay-as-you-go checker for multilingual plagiarism and AI-text scans.
- API access
6.9/10★★★☆☆Visit Viper -
Best forWindows users comparing documents in bulk
A capable Windows checker for bulk comparisons, reports, and AI-content screening.
- Academic source matching
- Web source matching
6.8/10★★★☆☆Visit site -
Best forWindows users checking local document collections
A broad local document checker for Windows users who need web, academic, and AI checks.
- Academic source matching
- Web source matching
6.7/10★★★☆☆Visit site -
Best forWindows and Mac users wanting one-time pricing
A practical desktop checker with one-time pricing, broad file support, and focused coverage.
6.6/10★★★☆☆Visit Plagius -
Best forFree users needing academic and publisher sources
A broad plagiarism checker for academic, publisher, web, and AI-content checks.
- API access
6.5/10★★★☆☆Visit Plagiarisma -
Best forDevelopers wanting open-source code checking
A free, developer-focused checker for source-code similarity, with web, API, CLI, and self-hosting.
- API access
6.4/10★★★☆☆Visit Dolos -
Best forInstitutions needing self-hosted code analysis
A focused, self-hosted tool for structure-aware comparison of programming submissions.
- API access
6.3/10★★★☆☆Visit JPlag -
Best forTeams wanting pay-per-credit web and academic checks
Pay per file for web and academic matching, AI checks, and downloadable PDF reports.
- LMS integration
- Academic source matching
- Web source matching
6.2/10★★★☆☆Visit Red Paper
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Web source matching | Academic source matching | Score |
|---|---|---|---|---|---|---|
| 1 | Turnitin AI Writing Detection | No | Yes | Yes | 9.4 | |
| 2 | Crossref Similarity Check | No | Yes | Yes | 9.2 | |
| 3 | iThenticate | No | $125 one-time | Yes | Yes | 9.0 |
| 4 | Copyscape | Yes | Yes | 8.9 | ||
| 5 | MOSS | Yes | Free | No | No | 8.8 |
| 6 | StrikePlagiarism | No | €2.33/unit usage-based | Yes | Yes | 8.7 |
| 7 | DrillBit | No | $5 one-time | Yes | Yes | 8.6 |
| 8 | PlagiarismCheck.org | Yes | Yes | Yes | 8.5 | |
| 9 | Noplag | Yes | $9.99/mo | Yes | Yes | 8.4 |
| 10 | Quetext AI Detector | Yes | $7.99/mo | Yes | Yes | 8.3 |
| 11 | Copyleaks AI Detector | 8.2 | ||||
| 12 | Originality.ai | Yes | 8.1 | |||
| 13 | SmallSEOTools Plagiarism Checker | Yes | $94.08/yr | Yes | Yes | 8.0 |
| 14 | PrePostSEO Plagiarism Checker | Yes | $5.25/mo | Yes | 7.9 | |
| 15 | Smodin Plagiarism Checker | Yes | $10/mo | Yes | Yes | 7.8 |
| 16 | DupliChecker | Yes | Yes | Yes | 7.7 | |
| 17 | Scribbr Plagiarism Checker | Yes | Yes | Yes | 7.6 | |
| 18 | Compilatio Magister+ | No | Yes | Yes | 7.5 | |
| 19 | Plagiat.pl | No | $3 one-time | Yes | Yes | 7.4 |
| 20 | PlagAware | Yes | €2.99/mo | Yes | Yes | 7.3 |
| 21 | PlagiarismSearch | Yes | $114.95/yr | Yes | Yes | 7.2 |
| 22 | Plag | Yes | €14.95/mo | Yes | Yes | 7.1 |
| 23 | Plagramme | Yes | $14.95/mo | Yes | Yes | 7.0 |
| 24 | Viper | No | £5/unit one-time | 6.9 | ||
| 25 | Plagiarism Checker X | Yes | Yes | Yes | 6.8 | |
| 26 | Plagiarism Detector | Yes | Yes | Yes | 6.7 | |
| 27 | Plagius | No | $6.90 one-time | 6.6 | ||
| 28 | Plagiarisma | Yes | 6.5 | |||
| 29 | Dolos | Yes | Free | No | No | 6.4 |
| 30 | JPlag | Free | No | No | 6.3 | |
| 31 | Red Paper | Yes | Yes | 6.2 |
Head-to-head All 28 comparisons →
- Turnitin AI Writing Detection vs Crossref Similarity Check
- Turnitin AI Writing Detection vs iThenticate
- Turnitin AI Writing Detection vs Copyscape
- Turnitin AI Writing Detection vs MOSS
- Turnitin AI Writing Detection vs StrikePlagiarism
- Turnitin AI Writing Detection vs DrillBit
- Turnitin AI Writing Detection vs PlagiarismCheck.org
- Crossref Similarity Check vs iThenticate
- Crossref Similarity Check vs Copyscape
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How we rank plagiarism checkers
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update