- Similarity Reports: Generates percentage-based similarity scores with matched source highlighting.
- Extensive Content Database: Compares submissions against student papers, academic journals, and web sources.
- Match Filtering: Allows exclusion of quotes, bibliographies, and small matches for cleaner analysis.
- LMS Integration: Integrates with systems like Moodle, Canvas, and Blackboard.
- Instructor Review Tools: Supports manual review and contextual interpretation of similarity results.
Turnitin Similarity
Institution-grade similarity checking for academic originality and integrity
Updated February 27, 2026
Turnitin Similarity Overview
Turnitin Similarity is an academic integrity tool designed for institutions to identify text similarity in student and research submissions. It compares documents against extensive databases of student papers, scholarly publications, and web content.
The tool provides detailed similarity reports that help educators and administrators assess originality, support proper citation practices, and investigate potential plagiarism within established academic workflows.
Key Features
Pricing
| Plan | Price | Featured |
|---|---|---|
| Turnitin Similarity (Institution License) | Custom Quote (Annual Contract) | Similarity Reports, Large academic database access, LMS integration |
Pros
Competitor |
Pros |
|---|---|
| Grammarly Plagiarism Checker | Turnitin Similarity offers deeper academic database coverage than Grammarly, especially with student paper repositories. While Grammarly is easier for individuals to access, Turnitin provides more rigorous institutional controls, better LMS integration, and reports designed for formal academic review rather than casual writing checks. |
| Copyscape | Compared to Copyscape, Turnitin Similarity is better suited for education, offering structured similarity reports and academic source matching. Copyscape focuses mainly on web duplication, while Turnitin excels in scholarly content, instructor workflows, and policy-driven integrity enforcement. |
| Unicheck | Turnitin Similarity provides broader database depth and stronger brand trust in higher education. While Unicheck is often more affordable and simpler to deploy, Turnitin remains preferred for high-stakes academic assessment and large institutional environments. |
| iThenticate | Turnitin Similarity is more classroom-focused than iThenticate, which targets publishers and researchers. For student assessments, Turnitin offers clearer reports, better LMS integration, and educator-oriented workflows, making it more practical for teaching institutions. |
| PlagScan | Compared to PlagScan, Turnitin Similarity benefits from a much larger proprietary database of student submissions. Although PlagScan can be more transparent in pricing, Turnitin delivers stronger detection depth and long-established academic credibility. |
Cons
Competitor |
Cons |
|---|---|
| Grammarly Plagiarism Checker | Turnitin Similarity is far less accessible to individual users compared to Grammarly. It lacks transparent pricing and personal plans, making it impractical for freelancers or independent students who want quick plagiarism checks without institutional approval. |
| Copyscape | Compared to Copyscape’s pay-as-you-go model, Turnitin Similarity requires institutional contracts and longer procurement cycles. This makes it slower to adopt and more expensive for organizations that only need occasional or lightweight plagiarism detection. |
| Unicheck | Unicheck offers clearer pricing and simpler onboarding than Turnitin Similarity. Turnitin’s interface and reports can feel complex for new instructors, requiring training to interpret similarity scores correctly and avoid misuse. |
| iThenticate | For advanced research plagiarism detection, Turnitin Similarity is less specialized than iThenticate. Researchers may find Similarity reports too education-focused and lacking the publishing-oriented workflows that iThenticate provides. |
| PlagScan | PlagScan can be more flexible with data ownership and regional compliance options. Turnitin Similarity has faced criticism for data retention concerns, which may be a drawback for institutions with strict privacy or regulatory requirements. |
Reviews
- sunyempire.edu Review: The guide explains how Turnitin Similarity lets students review a “Similarity Score” before final submission, with color-coded ranges from blue (0–20%) to red (81% or greater) that quickly signal match levels. It highlights how the interactive Similarity Report helps writers revise citations, paraphrasing, and quoting, and notes that reports may take time to appear and require refreshing the browser.
- uark.edu Review: Turnitin Similarity Reports display an “Originality score” directly inside the Blackboard Ultra Gradebook, and instructors can click the percentage match pill to open the full report in a new tab. The article stresses that no specific percentage automatically triggers an academic integrity report and emphasizes that instructors must rely on human judgment when reviewing the interactive report.
