Best Plagiarism Checkers in 2026
Updated
In short: PrePostSEO Plagiarism Checker is ranked #1 of 31 as of 4 October 2026, ahead of Smodin Plagiarism Checker and Noplag. The best-ranked option with a free plan is Noplag. The lowest first paid tier on this page is PrePostSEO Plagiarism Checker at $0.35/mo.
When reviewing writing for possible matches, the right plagiarism checker depends partly on the sources it searches and the material you need to submit. Compare academic and web source matching, supported languages, and word limits. Report export formats, LMS integration, and API access may also matter if results need to fit into a broader workflow. Smodin Plagiarism Checker, PrePostSEO Plagiarism Checker, and PlagiarismCheck.org are among the first entries in this 29-product ranking. Check free-plan availability and published starting prices under “Paid from” as you weigh the listed capabilities.
31 plagiarism checkers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | App | Score | From | Free plan | Paid from | Web source matching | Academic source matching | Supported languages | Word limit | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | PrePostSEO Plagiarism Checker | 7.4 | $0.35/mo | Yes | 5.25 /mo | Yes | — | 20 languages | 1,000 words | View |
| 2 | Smodin Plagiarism Checker | 7.3 | $10/mo | Yes | 10 /mo | Yes | Yes | — | — | View |
| 3 | Noplag | 6.4 | $9.99/mo | Yes | 9.99 /mo | Yes | Yes | 5 languages | 2,500 words | View |
| 4 | PlagAware | 6.4 | €2.99/mo | Yes | — | Yes | Yes | — | — | View |
| 5 |  SmallSEOTools Plagiarism Checker | 6.4 | $7.84/mo | Yes | 9.8 /mo | Yes | Yes | — | 1,000 words | View |
| 6 | Originality.ai | 6.3 | $12.95/mo | Yes | 12.95 /mo | — | — | — | 10,000 words | View |
| 7 | Quetext AI Detector | 6.3 | $7.99/mo | Yes | 7.99 /mo | Yes | Yes | 14 languages | 1,000 words | View |
| 8 |  Plagiarisma | 6.2 | Free | Yes | — | — | — | — | — | View |
| 9 | PlagiarismCheck.org | 5.8 | — | Yes | — | Yes | Yes | — | — | View |
| 10 | PlagiarismSearch | 5.8 | $27.95/mo | Yes | — | Yes | Yes | — | 150 words | View |
| 11 |  Viper | 5.8 | — | No | — | — | — | — | — | View |
| 12 |  DupliChecker | 5.7 | $9.99/mo | Yes | — | Yes | Yes | — | — | View |
| 13 |  Plagius | 5.6 | $0.41/mo | No | — | — | — | — | — | View |
| 14 | Copyleaks AI Detector | 5.5 | — | — | — | — | — | — | 300,000 words | View |
| 15 | Plagiarism Checker X | 5.4 | — | Yes | — | Yes | Yes | — | 3,200 words | View |
| 16 | Plagramme | 5.4 | — | Yes | 14.95 /mo | Yes | Yes | — | — | View |
| 17 | Red Paper | 5.4 | — | — | — | Yes | Yes | — | — | View |
| 18 | Scribbr Plagiarism Checker | 5.4 | — | Yes | — | Yes | Yes | 20 languages | — | View |
| 19 |  Dolos | 5.3 | — | Yes | — | No | No | — | — | View |
| 20 | JPlag | 5.3 | — | — | — | No | No | — | — | View |
| 21 |  MOSS | 5.3 | — | Yes | — | No | No | 24 languages | — | View |
| 22 | Plag | 5.3 | — | Yes | — | Yes | Yes | 129 languages | — | View |
| 23 | Compilatio AI Detector | 5.2 | — | No | — | Yes | Yes | — | — | View |
| 24 |  Copyscape | 5.2 | — | Yes | — | Yes | — | — | — | View |
| 25 | DrillBit | 5.2 | — | No | — | Yes | Yes | — | — | View |
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 checker is ranked first on Samsung Mobile US Press?
PrePostSEO Plagiarism Checker is ranked #1 of 31 with a score of 7.4. Smodin Plagiarism Checker is second and Noplag third.
How many of these have a free plan?
6 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, PrePostSEO Plagiarism Checker has the lowest first paid tier we found: $0.35/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.