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
- Home
- Documents & Writing
- Plagiarism Checkers
Best Plagiarism Checkers 2026
Facts read 30 Sep 2026 – 21 Oct 2026
Noplag leads this list of 31 (record score 6.1, free plan). Plagiarisma is next (record score 6.0, free plan), and PrePostSEO Plagiarism Checker is the next highest-placed with a free plan (record score 5.9).
When reviewing writing, plagiarism checkers can be compared by the sources they match and the limits they place on submissions. Academic and web source matching, supported languages, and word limit help clarify what each option covers. Report export formats, LMS integration, and API access offer additional comparison points if results need to move into another workflow. PrePostSEO Plagiarism Checker, Smodin Plagiarism Checker, and Noplag are among the named tools. Check free-plan availability and paid-from pricing as well, then weigh the listed capabilities against the writing you need to review and the reports you want to use.
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 PrePostSEO Plagiarism Checker | It may suit students, teachers, researchers, content writers, and bloggers who need plagiarism checks and matched-source details. | 5.9 | $7.50 a year | Free plan | Android, iPhone & iPad, Web, Windows | 4 Oct 2026 |
| 04 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 |
| 05 Smodin Plagiarism Checker | The checker may suit students, academics, teachers, writers, researchers, journalists, professionals, and businesses who need to review text for matches against web or… | 5.6 | $10 a month, billed yearly | Free plan | Android, iPhone & iPad, Web, Browser extension | 30 Sep 2026 |
| 06 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 |
| 07 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 |
| 08 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 |
| 09 PlagAware | PlagAware may suit educational institutions, businesses, and individuals checking or monitoring text for plagiarism and duplicate content. | 5.5 | €2.99 a month | Free plan | Web, API | 15 Oct 2026 |
| 10 PlagiarismSearch | PlagiarismSearch suits students, educators, writers, bloggers, universities, and organizations checking originality or AI-writing indicators. | 5.3 | $27.95 a month | Free plan | Web, Browser extension, API | 2 Oct 2026 |
02
Plagiarisma
Plagiarisma may suit students, bloggers, and freelance writers checking text for originality.
AndroidWebWindows+2 Record6.0 Visit
03
PrePostSEO Plagiarism Checker
It may suit students, teachers, researchers, content writers, and bloggers who need plagiarism checks and matched-source details.
AndroidiPhone & iPadWeb+3 Record5.9 Visit
04
Dolos
Dolos suits teachers checking programming tests, exams, or exercises where limited collaboration is permitted.
WebWindowsMac+3 Record5.6 Visit
05
Smodin Plagiarism Checker
The checker may suit students, academics, teachers, writers, researchers, journalists, professionals, and businesses who need to review text for matches against web or…
AndroidiPhone & iPadWeb+2 Record5.6 Visit
6
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.
7
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.
8
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.
9
PlagAware
WebAPI €2.99 a month Record5.5 Visit PlagAware may suit educational institutions, businesses, and individuals checking or monitoring text for plagiarism and duplicate content.
10
PlagiarismSearch
WebBrowser extensionAPI $27.95 a month Record5.3 Visit PlagiarismSearch suits students, educators, writers, bloggers, universities, and organizations checking originality or AI-writing indicators.
12
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.
13
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.
16
Plagiarism Checker X
Windows $39.95 one-time Record4.9 Visit It suits students, teachers, writers, universities, colleges, and SEO agents who need to review text for similarity.
18
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.
19
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.
More in Documents & Writing
Translation Software 156Survey Software 131PDF editors 102Presentation software 93Grammar checkers 88AI Presentation Software 84Text Editors 82Mobile Scanning Apps 76E-Signature Software 68Document Management Software 63Cover Letter Software 62Screen Capture Software 61Market Research Software 59Event Registration Software 55Employee Survey Software 49File Sharing Software 47PDF Converter Software 47PDF Creation Software 46