Best Plagiarism Checkers in 2026
Updated
In short: PlagiarismCheck.org is ranked #1 of 29 as of 2 October 2026, ahead of PlagiarismSearch and PlagAware. The best-ranked option with a free plan is PlagAware. The lowest first paid tier on this page is PlagAware at €2.99/mo.
When reviewing writing for possible matches, the source coverage and reporting options can shape which plagiarism checker fits the task. Compare academic and web source matching alongside supported languages and word limits. LMS integration and API access may be relevant if the checker needs to work with existing systems; report export formats show how results can be delivered. PlagiarismCheck.org, PlagiarismSearch, and PlagAware lead the ranking, with Noplag next among the early entries. Free-plan availability and paid-from pricing round out the comparison, helping you assess access alongside the kinds of writing you need to check.
29 plagiarism checkers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Web source matching | |
|---|---|---|---|---|---|---|---|---|
| 1 | PlagiarismCheck.org | 8.7 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 2 | PlagiarismSearch | 8.5 | RecognisedAPIDocumented | $27.95/mo | Yes | — | Yes | View |
| 3 | PlagAware | 8.4 | RecognisedAPIDocumented | €2.99/mo | Yes | — | Yes | View |
| 4 | Noplag | 8.3 | RecognisedAPIDocumented | $9.99/mo | Yes | 9.99 /mo | Yes | View |
| 5 | Quetext AI Detector | 8.2 | RecognisedAPIDocumented | $7.99/mo | Yes | 7.99 /mo | Yes | View |
| 6 | Originality.ai | 8.0 | RecognisedAPIDocumented | $12.95/mo | Yes | 12.95 /mo | — | View |
| 7 | Smodin Plagiarism Checker | 7.9 | RecognisedAPIDocumented | $10/mo | Yes | 10 /mo | Yes | View |
| 8 |  SmallSEOTools Plagiarism Checker | 6.7 | RecognisedAPIDocumented | — | Yes | 9.8 /mo | Yes | View |
| 9 |  Turnitin AI Writing Detection | 6.6 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 10 | StrikePlagiarism | 6.5 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 11 |  Crossref Similarity Check | 6.4 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 12 | DrillBit | 6.4 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 13 | PrePostSEO Plagiarism Checker | 6.3 | RecognisedAPIDocumented | — | Yes | 5.25 /mo | Yes | View |
| 14 |  iThenticate | 6.2 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 15 |  Plagiarisma | 6.2 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 16 | Copyleaks AI Detector | 6.1 | RecognisedAPIDocumented | — | — | — | — | View |
| 17 |  DupliChecker | 6.1 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 18 | Scribbr Plagiarism Checker | 5.9 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 19 |  Copyscape | 5.7 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 20 | Plag | 5.7 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 21 | Plagramme | 5.7 | RecognisedAPIDocumented | — | Yes | 14.95 /mo | Yes | View |
| 22 | Plagiarism Checker X | 5.6 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 23 |  Plagiat.pl | 5.4 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 24 | Plagiarism Detector | 5.4 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 25 |  MOSS | 5.3 | RecognisedAPIDocumented | — | Yes | — | No | View |
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 checker is ranked first on Inferse?
PlagiarismCheck.org is ranked #1 of 29 with a score of 8.7. PlagiarismSearch is second and PlagAware third.
How many of these have a free plan?
5 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, PlagAware has the lowest first paid tier we found: €2.99/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.