Best Plagiarism Detection Software in 2026
Updated
In short: Plagium is ranked #1 of 28 as of 4 October 2026, ahead of GPTZero and Noplag. The best-ranked option with a free plan is GPTZero. The lowest first paid tier on this page is Plagius at $0.41/mo.
Checking writing for possible plagiarism calls for attention to both document requirements and the tools around the review process. The ranking opens with Plagium, PlagiarismCheck.org, and Noplag. Compare maximum check size and supported languages with the materials you expect to review. Browser extensions and LMS integrations are additional points to consider for how checks fit into everyday work, while AI detection and API access expand the comparison. Free-plan availability and paid starting price also appear among the criteria. Weigh these features against your review workflow, whether you are checking coursework, research, or other writing.
28 plagiarism detection software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 Plagium iPhone + Android RecognisedPhone appDocumentedFree plan 7.8Free LMS integrations: YesAPI access: Yes
- 2 GPTZero No phone app RecognisedPhone appDocumentedFree plan 6.4$8.33/mo API access: Yes
- 3 Noplag No phone app RecognisedPhone appDocumentedFree plan 6.3$9.99/mo API access: Yes
- 4 Noplag Engine No phone app RecognisedPhone appDocumentedFree plan 6.3$9.99/mo AI detection: NoLMS integrations: YesAPI access: Yes
- 5 Originality.ai No phone app RecognisedPhone appDocumentedFree plan 6.3$12.95/mo API access: Yes
- 6 Pangram No phone app RecognisedPhone appDocumentedFree plan 6.3$1.67/mo API access: Yes
- 7 Quetext AI Detector No phone app RecognisedPhone appDocumentedFree plan 6.3$7.99/mo API access: Yes
- 8 SmallSEOTools Plagiarism Checker No phone app RecognisedPhone appDocumentedFree plan 6.3$7.84/mo API access: Yes
- 9 Winston AI No phone app RecognisedPhone appDocumentedFree plan 6.3$0.42/mo API access: Yes
- 10 JPlag No phone app RecognisedPhone appDocumentedFree plan 6.2Free AI detection: NoLMS integrations: NoAPI access: Yes
- 11 Plagiarisma No phone app RecognisedPhone appDocumentedFree plan 6.2Free LMS integrations: YesAPI access: Yes
- 12 PlagiarismCheck.org No phone app RecognisedPhone appDocumentedFree plan 5.8 API access: Yes
- 13 DupliChecker No phone app RecognisedPhone appDocumentedFree plan 5.7$9.99/mo API access: Yes
- 14 PlagiarismDetector.net No phone app RecognisedPhone appDocumentedFree plan 5.7$9.99/mo LMS integrations: YesAPI access: Yes
- 15 Turnitin Originality No phone app RecognisedPhone appDocumentedFree plan 5.7 AI detection: YesLMS integrations: YesAPI access: Yes
- 16 Plagius No phone app RecognisedPhone appDocumentedFree plan 5.6$0.41/mo LMS integrations: NoAPI access: No
- 17 Codequiry No phone app RecognisedPhone appDocumentedFree plan 5.5€25.76/mo AI detection: YesLMS integrations: YesAPI access: Yes
- 18 Copyleaks AI Detector No phone app RecognisedPhone appDocumentedFree plan 5.5 API access: Yes
- 19 Plag.ai No phone app RecognisedPhone appDocumentedFree plan 5.2 AI detection: Yes
- 20 Codeleaks No phone app RecognisedPhone appDocumentedFree plan 5.1 AI detection: NoAPI access: Yes
- 21 Dolos No phone app RecognisedPhone appDocumentedFree plan 5.1 API access: Yes
- 22 Scribbr Plagiarism Checker No phone app RecognisedPhone appDocumentedFree plan 5.1
- 23 Copyscape No phone app RecognisedPhone appDocumentedFree plan 5.0 API access: Yes
- 24 DrillBit No phone app RecognisedPhone appDocumentedFree plan 5.0 API access: Yes
- 25 MOSS No phone app RecognisedPhone appDocumentedFree plan 5.0
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 Samsung Mobile US Press?
Plagium is ranked #1 of 28 with a score of 7.8. GPTZero is second and Noplag 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 mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.