Best Plagiarism Detection Software in 2026
Updated
In short: Noplag is ranked #1 of 28 as of 4 October 2026, ahead of Noplag Engine and Plagium. The best-ranked option with a free plan is Noplag Engine. The lowest first paid tier on this page is Plagius at $0.41/mo.
Reviewing writing for possible copied material calls for a closer look at what each checker supports. Compare maximum check size and supported languages for the documents you handle, then weigh browser extensions and LMS integrations against your workflow. AI detection and API access offer further distinctions, while free plans and paid-from pricing help frame availability and cost. The ranking starts with Noplag, PlagiarismCheck.org, and Plagium, with PlagiarismDetector.net and Originality.ai also among the first entries. Use these listed features to consider which tools suit the kinds of writing you review and where those checks need to fit.
28 plagiarism detection software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#2 Noplag Engine Runner-up · 7.2 Free plan · $9.99/mo
#3 Plagium Also great · 7.1 Free plan · Free- Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$9.99/mofirst paid tier About NoplagVisit site - Free planFree trial apiLinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- AI detection
- No
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$9.99/mofirst paid tier About Noplag EngineVisit site - Free plan AndroidiOSWeb
- Free plan
- Yes
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - Free planFree trial apiextensionWeb
- Free plan
- Yes
- API access
- Yes
- Browser extension
- Yes
RecognisedDocumentedFree planPlatforms$8.33/mofirst paid tier About GPTZeroVisit site - Free plan apiLinuxmacOSself-hostedWindows
- Free plan
- Yes
- AI detection
- No
- LMS integrations
- No
- API access
- Yes
- Browser extension
- No
RecognisedDocumentedFree planPlatforms - Free plan apiextensionWeb
- Free plan
- Yes
- API access
- Yes
- Browser extension
- Yes
RecognisedDocumentedFree planPlatforms$12.95/mofirst paid tier About Originality.aiVisit site - Free planFree trial apiextensionWeb
- Free plan
- Yes
- API access
- Yes
- Browser extension
- Yes
RecognisedDocumentedFree planPlatforms$1.67/mofirst paid tier About PangramVisit site - Free plan WebWindows
- Free plan
- Yes
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - Free plan apiextensionWeb
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$7.99/mofirst paid tier About Quetext AI DetectorVisit site - Free plan apiextensionWeb
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$7.84/mofirst paid tier About SmallSEOTools Plagiarism CheckerVisit site - Free planFree trial apiextensionWeb
- Free plan
- No
- API access
- Yes
- Browser extension
- Yes
RecognisedDocumentedFree planPlatforms$0.42/mofirst paid tier About Winston AIVisit site - Free trial apiLinuxmacOSWebWindows
- Free plan
- No
- AI detection
- Yes
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms€25.76/mofirst paid tier About CodequiryVisit site - Free trial macOSWebWindows
- Free plan
- No
- LMS integrations
- No
- API access
- No
RecognisedDocumentedFree planPlatforms$0.41/mofirst paid tier About PlagiusVisit site - apiextensionWeb
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - apiWeb
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$9.99/mofirst paid tier About DupliCheckerVisit site - apiextensionWeb
- Free plan
- Yes
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms$9.99/mofirst paid tier About PlagiarismDetector.netVisit site - Web
- Free plan
- No
- AI detection
- Yes
- LMS integrations
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - Web
- API access
- Yes
- Browser extension
- Yes
RecognisedDocumentedFree planPlatforms - WebWindowsLinux
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- AI detection
- Yes
RecognisedDocumentedFree planPlatforms - Web
- AI detection
- No
- API access
- Yes
RecognisedDocumentedFree planPlatforms - WebLinux
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - WebLinux
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- API access
- Yes
RecognisedDocumentedFree planPlatforms
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which plagiarism detection software is ranked first on Everything Xiaomi?
Noplag is ranked #1 of 28 with a score of 7.2. Noplag Engine is second and Plagium third.
How many of these have a free plan?
11 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Plagius has the lowest first paid tier we found: $0.41/mo.
How is this list ranked?
Ranked on what each maker publishes: documentation depth, a free tier and the platforms it runs on. Paid placements never change a rank.