Turnitin Similarity
Turnitin Similarity is a web and API product that helps educators review student work for possible plagiarism and collusion.
What Turnitin Similarity is
Turnitin Similarity is a web and API product that helps educators review student work for possible plagiarism and collusion. It compares submissions with student papers, current and archived web pages, and premium publisher articles across 170 languages. Reports present a similarity score, colour-coded matches, side-by-side source comparisons, and controls to exclude matches. A Flags Panel highlights potentially manipulated text, including replaced or hidden characters. Turnitin states that a similarity match is not a plagiarism verdict; educators decide whether misconduct occurred. Formative resubmissions through a learning management system can help students improve originality before final submission. The product integrates with LMS platforms such as D2L, Canvas, Moodle, and Sakai through native connections, API, or LTI 1.3. It supports many document formats and PDF report export. AI writing and paraphrasing detection are available through the Turnitin Originality add-on, with AI detection noted as English-only. Pricing is on request.
Good
- Compares content across 170 languages
- Reports show scores and source comparisons
- Flags potentially manipulated characters
- Supports LMS, API, and LTI 1.3
- PDF report export is available
Watch out
- Pricing is on request
- Similarity does not determine plagiarism
- AI detection add-on is English-only
- Requires an institutional product arrangement
Who it suits
It suits schools and educators needing similarity reports, source comparisons, LMS workflows, and API access. Students and administrators are also identified as supported users.
Verdict
Turnitin Similarity offers broad source comparison and LMS integration for academic review. Its reports identify matches rather than deciding misconduct, and pricing requires contacting Turnitin.
Plans and prices
From Turnitin Similarity's own pricing page, checked 3 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Turnitin Similarity | Priced on request | Institutional product · pricing not stated on the opened page · Contact sales for pricing |
The facts
Each one read from Turnitin Similarity's own pages, with the date it was checked.
What it does
- AI detection add-on
- AI writing and AI paraphrasing detection are available through the Turnitin Originality add-on, with the AI feature noted as English-only.checked 3 Oct 2026
- Content coverage
- The product compares work with student submissions, current and archived web pages, and premium publisher articles across 170 languages.checked 3 Oct 2026
- Flags panel
- The Flags Panel highlights potentially manipulated text, including replaced or hidden characters.checked 3 Oct 2026
- Formative use
- The product supports formative resubmissions through an LMS and is presented as a way to help students improve originality before final submission.checked 3 Oct 2026
- Integrations
- Turnitin Similarity can be used on the web or integrated natively or through API and LTI 1.3 with LMSs including D2L, Canvas, Moodle, and Sakai.checked 3 Oct 2026
- Purpose
- Turnitin Similarity compares student work with existing content to help educators review potential plagiarism and student collusion.checked 3 Oct 2026
- Security
- The product page states that data is protected with SSL encryption, redundant servers, SOC 2-certified data centres, and GDPR compliance.checked 3 Oct 2026
- Similarity is not a plagiarism verdict
- Turnitin says Similarity flags text matches that may constitute plagiarism but does not determine whether plagiarism occurred.checked 3 Oct 2026
- Similarity reports
- Reports show a similarity score, colour-coded matches, side-by-side source comparisons, and options to exclude matches.checked 3 Oct 2026
- Support
- Turnitin directs users to its Help Center for product guides, release notes, searchable help content, and technical support contact options.checked 3 Oct 2026
- Supported users
- Turnitin identifies students, instructors, and administrators as users the product supports.checked 3 Oct 2026
The company
- Company
- Turnitin says it has served the global education community since 1998 and lists an office in Oakland, California.checked 3 Oct 2026
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