Side by side
Plag.ai vs WINNOWR
Both stand on plagiarism detection software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Choose Plag.ai if you need web-based plagiarism, AI-detection, or translated-plagiarism checks, especially across languages. Educators can access premium plagiarism and AI services free; others who need recurring checks beyond the homepage evaluations should consider a paid plan.
Visit Plag.aiChoose WINNOWR if an institution wants free, API-based web-source matching with reviewable reports and the option to self-host. Look elsewhere if you need a mature, fixed product or guaranteed page snippets and highlighted evidence; the project is still developing and that enrichment is best-effort.
Visit WINNOWRThe facts
| Plag.ai | WINNOWR | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | API, Linux, Self-hosted, Web |
| Lowest paid plan | Basic: €14.95 a month | Not published |
| Plans published | 3 | None |
| Maker | Not published | Not published |
| Website | plag.ai | github.com |
| On plagiarism detection software | #18 of 28 | #22 of 28 |
Plag.ai: what it does well
- Checks for copied text, improper references, and paraphrases.
- Highlights matches and links to sources.
- AI checks support more than 50 languages with sentence-level breakdowns.
- Translated-plagiarism checks analyze meaning across 56 languages.
- Educators can use premium plagiarism and AI services free with unlimited uploads.
What to know first
- Paid plans are billed monthly, starting at €14.95 a month.
- The homepage's free access is limited to up to three evaluations.
WINNOWR: what it does well
- Free to use.
- Accepts text and file submissions through an HTTP API.
- Reports include overlap, source URLs, and highlighted passages.
- Institutions can build indexes from their own corpus.
- Deployment instructions include plain Linux machines.
What to know first
- The project is still actively evolving.
- Source snippets and highlighted passages may be unavailable for some pages.
- Modified deployed versions must share modifications under GNU AGPLv3.
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