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 GPTZero. 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.
If you need to check writing for possible copied material, compare tools against the documents and review workflow you have in mind. Maximum check size and supported languages help clarify what each can handle; LMS integrations and browser extensions show how checks may fit into existing work. AI detection and API access add other points of comparison, while free-plan availability and paid-from pricing help you weigh cost. Noplag, Noplag Engine, and GPTZero are among the named options. Consider which features matter for the texts you review, where you expect to run checks, and whether you need a connection to a learning platform or API.
28 plagiarism detection software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Plagiarism Detection Software, ranked on how quickly a newcomer can get going. 15 of the 25 on this page can be tried for free.
- 1 NoplagPaid from $9.99/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 Noplag EnginePaid from $9.99/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 3 GPTZeroPaid from $8.33/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 4 Winston AIPaid from $0.42/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 5 PangramPaid from $1.67/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 6 PlagiumFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 7 Copyleaks AI DetectorPaid from $1.17/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 8 Originality.aiPaid from $12.95/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 9 PlagiusPaid from $0.41/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 10 SmallSEOTools Plagiarism CheckerPaid from $7.84/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 11 CodequiryPaid from €25.76/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 12 JPlagFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 13 PlagiarismaFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 Quetext AI DetectorPaid from $7.99/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 15 PlagiarismCheck.org
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 DupliCheckerPaid from $9.99/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 17 Turnitin Originality
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 18 PlagiarismDetector.netPaid from $9.99/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 19 DolosFree plan
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 20 Plag.ai
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 21 Codeleaks
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 MOSS
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 23 Scribbr Plagiarism Checker
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 WINNOWR
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 Copyscape
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Is your platform 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 The Geeks Club?
Noplag is ranked #1 of 28 with a score of 7.9. Noplag Engine is second and GPTZero third.
How many of these have a free plan?
12 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 how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.