The Best Plagiarism Detection Software in 2026
We researched plagiarism detection software from official websites, including pricing pages, plan tables and product documentation. Products are ranked on their core job—identifying copied or machine-generated content—plus value for money and verified features, so buyers can compare tools for academic, publishing and professional workflows.
Our top picks
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Top ranked
Turnitin Similarity#1 of 289.3/10A comprehensive academic similarity checker with LMS workflows and advanced match flags.
Pricing on request
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Runner-up
DrillBit#2 of 289.1/10Broad academic and classroom checks with one-time page-credit pricing.
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Top-ranked free plan
PlagiarismCheck.org#4 of 288.8/10Affordable checking with scholarly sources, authorship verification, reports, and LMS integrations.
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 28 tools, best first
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Best forInstitutions needing comprehensive LMS similarity checking
A comprehensive academic similarity checker with LMS workflows and advanced match flags.
- AI detection
- LMS integrations
- API access
9.3/10★★★★★Visit Turnitin -
Best forSchools wanting broad features at low per-use cost
Broad academic and classroom checks with one-time page-credit pricing.
- API access
9.1/10★★★★★Visit DrillBit -
Best forPublishers and researchers checking scholarly manuscripts
A scholarly similarity checker with deep academic coverage and flexible organizational integrations.
- API access
8.9/10★★★★☆Visit iThenticate -
Best forSchools needing affordable LMS-integrated checking
Affordable checking with scholarly sources, authorship verification, reports, and LMS integrations.
- API access
8.8/10★★★★☆Visit the website -
Best forBudget users wanting desktop and self-hosting options
A flexible plagiarism checker with self-hosting, APIs, LMS integrations, and low-cost plans.
- API access
Free plan · 14-day trial Our Noplag verdict → Visit NoplagFor vendors Sponsor this spot · #5 · $59/mo →8.6/10★★★★☆Visit Noplag -
Best forIndividuals and teams wanting free web checking
A flexible web checker with academic scans, reports, bulk uploads, and API access.
- API access
8.5/10★★★★☆Visit DupliChecker -
Best forStudents wanting polished one-off reports
A web-based checker for polished academic reports, with free screening and paid depth.
8.4/10★★★★☆Visit Scribbr -
Best forLow-cost general-purpose web and academic checks
A low-cost checker with broad matching, reports, URL scans, API access, and LMS support.
- API access
8.3/10★★★★☆Visit SmallSEOTools -
Best forWeb-focused checking with classroom integrations
A web-focused checker with broad file, reporting, LMS, and API support.
- LMS integrations
- API access
8.2/10★★★★☆Visit site -
Best forContent teams needing multilingual site-wide checks
A broad content integrity platform for multilingual plagiarism and AI-text checks.
- Browser extension
- API access
8.1/10★★★★☆Visit Originality.ai -
Best forSimple web checking and originality certificates
A flexible web checker with certificates, AI detection, and education-ready integrations.
- LMS integrations
- API access
8.0/10★★★★☆Visit Plagium -
Best forUsers needing broad file-format support
A broad-format checker for web, academic, URL, and document plagiarism scans.
- LMS integrations
- API access
7.9/10★★★★☆Visit Plagiarisma -
Best forPay-as-you-go academic and multilingual checking
A pay-as-you-go checker for academic, multilingual, and mixed-format reviews.
7.8/10★★★★☆Visit PlagPointer -
Best forMultilingual users needing translated-match detection
A strong multilingual checker with translated-match detection, reports, and academic analysis.
- AI detection
7.7/10★★★★☆Visit Plag.ai -
Best forWebsite owners needing scalable web duplication checks
A scalable web duplication checker with batch searches, private indexes, and API automation.
- API access
7.6/10★★★★☆Visit Copyscape -
Best forUsers wanting plagiarism and AI checks together
A flexible choice for combining AI detection and plagiarism checking in one workflow.
- API access
7.5/10★★★★☆Visit Quetext -
Best forTeams wanting free AI and plagiarism detection
A flexible detector with free AI checks, plagiarism scanning, OCR, and API workflows.
- Browser extension
- API access
7.4/10★★★★☆Visit Pangram -
Best forUsers prioritizing AI detection over plagiarism depth
A broad content-analysis suite with stronger AI detection than plagiarism depth.
- Browser extension
- API access
7.3/10★★★★☆Visit Winston AI -
Best forMultilingual AI and plagiarism screening
A multilingual detector that combines AI analysis, plagiarism screening, and broad workflow support.
- Browser extension
- API access
7.2/10★★★★☆Visit Copyleaks -
Best forUsers needing lightweight AI-authorship screening
A focused AI-authorship screener with useful education and browser workflows.
- Browser extension
- API access
7.1/10★★★★☆Visit GPTZero -
Best forDesktop users needing inexpensive batch checks
Affordable desktop checking with batch analysis, local comparisons, and AI detection.
7.0/10★★★★☆Visit Plagius -
Best forEducators checking programming assignments for free
A free programming-focused similarity checker with HTML reports and shared-code exclusion.
6.9/10★★★☆☆Visit MOSS -
Best forInstructors needing private, structure-aware code checks
A free, local code-similarity checker for instructors reviewing programming submissions.
- API access
6.8/10★★★☆☆Visit JPlag -
Best forDevelopers wanting open-source code checking
A free, developer-friendly tool for comparing programming submissions.
- API access
6.7/10★★★☆☆Visit Dolos -
Best forInstitutions checking source code and AI-generated code
A paid code-checking platform with peer, web, repository, and AI detection.
- AI detection
- LMS integrations
- API access
6.6/10★★★☆☆Visit Codequiry -
Best forTeams self-hosting configurable text matching
A configurable, self-hosted matcher for teams that need auditable similarity reports.
- LMS integrations
- API access
6.5/10★★★☆☆Visit Noplag Engine -
Best forOrganizations checking code provenance and licenses
A code-focused governance tool for provenance, licensing, and policy-based scanning.
- API access
6.4/10★★★☆☆Visit Codeleaks -
Best forEngineers building custom corpus-based checking
A self-hostable engine for teams building custom, corpus-based plagiarism checks.
- API access
6.3/10★★★☆☆Visit WINNOWR
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | API access | Score |
|---|---|---|---|---|---|
| 1 | Turnitin Similarity | No | Yes | 9.3 | |
| 2 | DrillBit | No | $5 one-time | Yes | 9.1 |
| 3 | iThenticate | No | $125 one-time | Yes | 8.9 |
| 4 | PlagiarismCheck.org | Yes | Yes | 8.8 | |
| 5 | Noplag | Yes | $9.99/mo | Yes | 8.6 |
| 6 | DupliChecker | Yes | Yes | 8.5 | |
| 7 | Scribbr Plagiarism Checker | Yes | 8.4 | ||
| 8 | SmallSEOTools Plagiarism Checker | Yes | $94.08/yr | Yes | 8.3 |
| 9 | PlagiarismDetector.net | Yes | $8/mo | Yes | 8.2 |
| 10 | Originality.ai | Yes | Yes | 8.1 | |
| 11 | Plagium | Yes | Yes | 8.0 | |
| 12 | Plagiarisma | Yes | Yes | 7.9 | |
| 13 | PlagPointer | No | £2.50/unit usage-based | 7.8 | |
| 14 | Plag.ai | Yes | €14.95/mo | 7.7 | |
| 15 | Copyscape | Yes | Yes | 7.6 | |
| 16 | Quetext AI Detector | Yes | $7.99/mo | Yes | 7.5 |
| 17 | Pangram | Yes | $20/mo | Yes | 7.4 |
| 18 | Winston AI | No | $120/yr | Yes | 7.3 |
| 19 | Copyleaks AI Detector | Yes | 7.2 | ||
| 20 | GPTZero | Yes | Yes | 7.1 | |
| 21 | Plagius | No | $6.90 one-time | No | 7.0 |
| 22 | MOSS | Yes | Free | 6.9 | |
| 23 | JPlag | Yes | Free | Yes | 6.8 |
| 24 | Dolos | Yes | Free | Yes | 6.7 |
| 25 | Codequiry | No | Yes | 6.6 | |
| 26 | Noplag Engine | Yes | Free | Yes | 6.5 |
| 27 | Codeleaks | Yes | 6.4 | ||
| 28 | WINNOWR | Yes | Free | Yes | 6.3 |
Head-to-head All 22 comparisons →
- Turnitin Similarity vs DrillBit
- Turnitin Similarity vs iThenticate
- Turnitin Similarity vs PlagiarismCheck.org
- Turnitin Similarity vs Noplag
- Turnitin Similarity vs DupliChecker
- Turnitin Similarity vs Scribbr Plagiarism Checker
- Turnitin Similarity vs SmallSEOTools Plagiarism Checker
- DrillBit vs DupliChecker
- DrillBit vs Scribbr Plagiarism Checker
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How we rank plagiarism detection software
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