Noplag’s plans are positioned for makers and small teams, agencies and publishers, and universities or regulated organizations.
Free plan Free trial Open source From $9.99 a month WebWindowsMacLinuxAPISelf-hosted
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Best Plagiarism Detection Software 2026
Facts read 29 Sep 2026 – 21 Oct 2026
Plagiarism detection software can help you review writing for possible matches with other material. Compared on maximum check size and supported languages, the entries offer practical details for the documents you expect to assess. LMS integrations and browser extensions are worth weighing in light of where reviews take place, while AI detection and API access add further comparison points. Check whether a free plan is offered and where paid access starts. Plagium, GPTZero, and Noplag are among the options, alongside Noplag Engine and Originality.ai. Compare the listed limits, language coverage, and access features with your review process, including the types of material you handle and the tools your workflow uses.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Noplag | Noplag’s plans are positioned for makers and small teams, agencies and publishers, and universities or regulated organizations. | 6.1 | $9.99 a month | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 02 Plagiarisma | Plagiarisma may suit students, bloggers, and freelance writers checking text for originality. | 6.0 | $99 a year | Free plan | Android, Web, Windows, Browser extension | 15 Oct 2026 |
| 03 Noplag Engine | The maker positions Free for trying the service or self-hosting, Pro for makers and small teams, Premium for agencies and publishers, and Enterprise for universities and… | 5.7 | $9.99 a month | Free plan | Web, Windows, Mac, Linux | 29 Sep 2026 |
| 04 Plagium | Plagium may suit educators, publishers, editors, companies, researchers, and compliance teams checking submitted writing. | 5.7 | $19.98 a month | Free plan | Android, iPhone & iPad, Web, Browser extension | 15 Oct 2026 |
| 05 Dolos | Dolos suits teachers checking programming tests, exams, or exercises where limited collaboration is permitted. | 5.6 | Free plan | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 06 JPlag | It suits educators and developers comparing sets of code submissions locally. | 5.6 | Free plan | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 07 Copyleaks AI Detector | Copyleaks suits students, writers, professionals, creators, educational institutions, and enterprise teams checking text for AI involvement. | 5.5 | Free plan | Free plan | Web, Browser extension, API, Self-hosted | 21 Oct 2026 |
| 08 Copyscape | It suits people checking web pages or written content for online copies, including those who want batch searches, private-index checks, or monitoring. | 5.5 | $4.95 a month | Free plan | Web, API, Self-hosted | 15 Oct 2026 |
| 09 Originality.ai | It suits website owners, content marketers, writers, and publishers who need to review text or scan site content. | 5.5 | $12.95 a month, billed yearly | Free plan | Web, Browser extension, API | 15 Oct 2026 |
| 10 Winston AI | Winston AI suits educators, SEO publishers, writers, and content creators who need AI-content detection or plagiarism checking. | 5.5 | $189 a month, billed yearly | Free plan | Web, Browser extension, API, Self-hosted | 15 Oct 2026 |
02
Plagiarisma
Plagiarisma may suit students, bloggers, and freelance writers checking text for originality.
AndroidWebWindows+2 Record6.0 Visit
03
Noplag Engine
The maker positions Free for trying the service or self-hosting, Pro for makers and small teams, Premium for agencies and publishers, and Enterprise for universities and…
WebWindowsMac+3 Record5.7 Visit
04
Plagium
Plagium may suit educators, publishers, editors, companies, researchers, and compliance teams checking submitted writing.
AndroidiPhone & iPadWeb+2 Record5.7 Visit
05
Dolos
Dolos suits teachers checking programming tests, exams, or exercises where limited collaboration is permitted.
WebWindowsMac+3 Record5.6 Visit
6
JPlag
WebWindowsMac+3 Free plan Record5.6 Visit It suits educators and developers comparing sets of code submissions locally.
7
Copyleaks AI Detector
WebBrowser extensionAPI+1 Free plan Record5.5 Visit Copyleaks suits students, writers, professionals, creators, educational institutions, and enterprise teams checking text for AI involvement.
8
Copyscape
WebAPISelf-hosted $4.95 a month Record5.5 Visit It suits people checking web pages or written content for online copies, including those who want batch searches, private-index checks, or monitoring.
9
Originality.ai
WebBrowser extensionAPI $12.95 a month, billed yearly Record5.5 Visit It suits website owners, content marketers, writers, and publishers who need to review text or scan site content.
10
Winston AI
WebBrowser extensionAPI+1 $189 a month, billed yearly Record5.5 Visit Winston AI suits educators, SEO publishers, writers, and content creators who need AI-content detection or plagiarism checking.
11
GPTZero
WebBrowser extensionAPI $8.33 a month, billed yearly Record5.4 Visit GPTZero may suit educators, hiring teams, publishers, journalists, and others assessing writing authenticity.
14
Pangram
WebBrowser extensionAPI $20 a month, billed yearly Record5.1 Visit Pangram suits people who need AI-content and plagiarism checks for documents, web text, or social feeds.
15
PlagiarismCheck.org
WebBrowser extensionAPI $5.99 one-time Record5.1 Visit It suits students, educators, institutions, researchers, and businesses needing browser-based originality or authorship checks.
16
DrillBit
AndroidiPhone & iPadWeb+1 $5 one-time Record5.0 Visit DrillBit may suit institutions, schools, researchers, publishers, businesses, or individuals seeking similarity checks, AI-content detection, and document analysis.
17
Quetext AI Detector
WebBrowser extensionAPI $7.99 a month, billed yearly Record4.9 Visit It may suit educators, writers, publishers, researchers, students, and other reviewers who need to assess text for AI generation or plagiarism.
18
SmallSEOTools Plagiarism Checker
WebBrowser extensionAPI $94.08 a year Record4.9 Visit The checker may suit students, teachers, writers, bloggers, marketers, researchers, and academics who want reports with matched-source details.
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