No. 20 of 26 ·AI Plagiarism Checkers

Turnitin Similarity

Web · API

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Turnitin Similarity is ranked #20 of 26 in AI plagiarism checkers on Freedom251. It runs on API, Web.

Turnitin Similarity plans and pricing

All plans

Turnitin Similarity Not published Contact sales for pricing Institutional product · pricing not stated on the opened page turnitin.co.uk · 3 Oct 2026

Compared on AI plagiarism checkers

Source coverage: web_academic_and_publisher
Supported file formats: DOC, DOCX, XLS, XLSX, PPT, PPTX, PostScript, PDF, HTML, HWP, RTF, ODT, WordPerfect, TXT
LMS integrations: Yes
API access: Yes
Report export: pdf
AI writing check: Yes

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The record

Purpose: Turnitin Similarity compares student work with existing content to help educators review potential plagiarism and student collusion.
Similarity reports: Reports show a similarity score, colour-coded matches, side-by-side source comparisons, and options to exclude matches.
Content coverage: The product compares work with student submissions, current and archived web pages, and premium publisher articles across 170 languages.
Flags panel: The Flags Panel highlights potentially manipulated text, including replaced or hidden characters.
Similarity is not a plagiarism verdict: Turnitin says Similarity flags text matches that may constitute plagiarism but does not determine whether plagiarism occurred.
Formative use: The product supports formative resubmissions through an LMS and is presented as a way to help students improve originality before final submission.
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.
Security: The product page states that data is protected with SSL encryption, redundant servers, SOC 2-certified data centres, and GDPR compliance.
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.
Supported users: Turnitin identifies students, instructors, and administrators as users the product supports.
Support: Turnitin directs users to its Help Center for product guides, release notes, searchable help content, and technical support contact options.
Company: Turnitin says it has served the global education community since 1998 and lists an office in Oakland, California.

Where it ranks on Freedom251

Best AI Plagiarism Checkers in 2026#20 of 26

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Sources

turnitin.co.uk/products/similarity/· checked 3 Oct 2026
in.turnitin.com/about/· checked 3 Oct 2026