Side by side
Plagius vs Turnitin Similarity
Both stand on ai plagiarism checkers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial MacWebWindows
Plagius combines document similarity checks with an AI-generation estimate and detailed reports. Its results are indicators for review, not confirmation, and the maker advises against external searches for sensitive or confidential data.
Visit Plagius Paid APIWeb
Turnitin Similarity combines broad source comparisons with reports and LMS workflows for reviewing student work. Its matches are indicators for educators to assess, not plagiarism verdicts, and pricing requires an inquiry.
Visit Turnitin SimilarityThe facts
| Plagius | Turnitin Similarity | |
|---|---|---|
| Free plan | A free trial | Not published |
| Open source | Not published | Not published |
| Runs on | Mac, Web, Windows | API, Web |
| Lowest paid plan | Plagius One Basic: $58.80 a year | Free or on request |
| Plans published | 9 | 1 |
| Maker | Not published | Not published |
| Website | plagius.com | turnitin.co.uk |
| On ai plagiarism checkers | #20 of 26 | #24 of 26 |
Plagius: what it does well
- Reports suspicious phrases, sources, and similarity percentages.
- Supports Word, PDF, OpenOffice, PowerPoint, and other formats.
- Professional desktop plans include local and batch comparisons.
- Free email support is listed.
- Offers AI-generation probability and confidence information.
What to know first
- Demo shows only some result information.
- External searches may send text fragments to search engines.
- AI detection may send paragraphs to Plagius servers.
- Automated results cannot confirm plagiarism without manual review.
Turnitin Similarity: what it does well
- Compares submissions, web pages, and publisher articles across 170 languages
- Reports show scores, colour-coded matches, and source comparisons
- Supports LMS connections, API, and LTI 1.3
- Offers formative resubmissions through an LMS
- PDF report export is supported
What to know first
- Pricing is available on request
- AI writing and paraphrasing detection require the Originality add-on
- The AI detection feature is English-only
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