Your university checks theses with Turnitin, but the journal you submit to uses iThenticate: are they the same thing? Not quite. The iThenticate vs Turnitin question confuses many researchers because both products come from Turnitin, both produce a similarity report, and both highlight matching text. The difference lies in who they are built for, which content they search, and what happens to your document after the check.
This article is part of our guide How to Write a Master’s Thesis by the Mastermind PhD team and relates to our Paraphrasing & Plagiarism Check service. Sources last checked: November 2026.
This guide sets out seven practical differences, explains who uses which tool, and shows what the difference means for your thesis and your first journal article.
What are Turnitin and iThenticate? Turnitin is the company’s education product line (Feedback Studio, Originality and related tools) used by instructors to check student assignments, give feedback and grade. iThenticate is its product for researchers, publishers and research offices, used to check manuscripts, grant proposals and theses against published scholarly literature and web content. Crossref’s Similarity Check service for journal publishers is powered by iThenticate.
iThenticate vs Turnitin at a glance
| Point of comparison | Turnitin (education products) | iThenticate |
|---|---|---|
| Main users | Instructors and students in courses | Researchers, publishers, editors, research offices |
| Typical document | Assignments, coursework, dissertations submitted in a course | Journal manuscripts, grant proposals, theses before final submission |
| Workflow | Submission through an assignment, often inside the learning platform | Upload by an account holder, often an editor or supervisor |
| Student paper repository | Instructors can choose whether submissions are stored in a repository of student papers | Focused on published content; organizations can add a private repository of their own uploads |
| Scholarly content | Included | Core strength; Crossref members contribute their full-text content |
| Feedback and grading tools | Yes | No; it is a checking tool |
| AI writing detection | Available in supported licenses | Added with iThenticate 2.0 (November 2023) for upgraded licenses |
Difference 1: who each tool is built for
The first iThenticate vs Turnitin difference is the audience. Turnitin’s education tools are designed around the classroom: an instructor creates an assignment, students submit, and the similarity report sits next to marking and feedback features. iThenticate is designed around research integrity. Its users are editors screening submissions, research offices checking grant proposals, and supervisors or graduate schools checking a thesis before it goes to examiners.
In the iThenticate vs Turnitin choice, you usually do not decide. The institution or the journal holds the license and decides which product applies to your document.
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Difference 2: the content each tool searches
Both tools compare your text with web pages and published works, but in iThenticate vs Turnitin the emphasis differs. Crossref describes the iThenticate database as containing over 78 million full-text scholarly content items, and it grows because publishers participating in Similarity Check let Turnitin index their full catalogs. Turnitin’s 2023 announcement of iThenticate 2.0 said the tool screens against 97% of the top 10,000 cited journals.
Turnitin’s education products add a large collection of previously submitted student papers when institutions choose to store them. This is why a match labeled “Student Paper” can appear in a course report but is a less central feature of a publisher’s check.
Difference 3: what happens to your document
In a course, the instructor or institution decides whether your submission is stored in the student paper repository. If it is stored, a later submission that reuses the same text, including your own, can match it. iThenticate organizational accounts can add a private repository so that new uploads are compared with earlier documents from the same organization only. Before you upload anything, ask how storage is configured, especially if you will later submit a related article.
Difference 4: AI writing detection
AI detection is a newer part of the iThenticate vs Turnitin comparison. Turnitin added AI writing detection to its education products in 2023. In November 2023 it announced iThenticate 2.0, with AI writing detection integrated into the similarity report and available with an upgraded license after a free preview. Whether you see an AI indicator therefore depends on the license your institution or publisher holds. Our guide to AI detection in Turnitin explains how the indicator works and why false positives happen.
Difference 5: the report and its focus
The iThenticate 2.0 report was redesigned to help research teams spot text recycling and duplicate publication. It groups matches into categories such as citations and quotations, offers exclusion tools, and adds a flags panel for deliberate text manipulation such as replaced or hidden characters. Turnitin’s course reports offer similar filters, but they sit inside a teaching workflow with rubrics and comments.
Difference 6: access for students
For students, the most visible iThenticate vs Turnitin difference is access. Most students meet Turnitin through their courses. Access to iThenticate is usually limited to staff. At UNSW Sydney, for example, higher degree research candidates do not have access to iThenticate: supervisors check their candidates’ written work and discuss the report with them. Other institutions give students a direct role. Virginia Tech requires graduate students to run their electronic thesis or dissertation through iThenticate and to review the report with their advisor before the final examination is scheduled.
Difference 7: who pays and how
Licensing is the last iThenticate vs Turnitin difference. Turnitin’s education products are licensed by institutions. iThenticate is licensed to organizations and, for journals, often accessed through Crossref Similarity Check. Crossref states that the service is available only to members actively publishing DOI-assigned content, with an annual service fee equal to 20% of the member’s Crossref annual membership fee plus per-document checking fees, and the first 100 documents free.
Why the same thesis can score differently
If your thesis showed 12% in Turnitin and a journal’s iThenticate check of the derived article shows a different figure, both reports can be correct. The iThenticate vs Turnitin difference in scores comes from:
- Different collections: a student paper repository on one side, a larger set of publisher full text on the other.
- Different settings: exclusion of quotes, bibliography and small matches is configured by whoever runs the check.
- Your own prior work: a thesis deposited in a repository, or a preprint, can match the new article.
- Time: sources published after your first check will match in the second.
No similarity percentage is a verdict on its own. Editors and examiners read the matches, not just the number.
iThenticate vs Turnitin for your thesis and your first paper
| Situation | Likely tool | Practical step |
|---|---|---|
| Coursework or taught dissertation | Turnitin (course assignment) | Follow the module’s submission instructions and settings |
| Doctoral thesis before examination | Often iThenticate, run by supervisor or graduate school | Ask who runs the check and when |
| Journal article from your thesis | iThenticate via Crossref Similarity Check | Cite your thesis and disclose overlap in the cover letter |
| Grant proposal | iThenticate in many research offices | Check that reused text from earlier proposals is your own and cited |
When you turn a thesis into an article, overlap with your own deposited thesis is common. Most journals accept it if it is disclosed, but check the journal’s policy on prior publication and mention the thesis in your cover letter.
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Frequently asked questions
Is iThenticate stricter than Turnitin?
Not in its matching method, which is shared technology. In the iThenticate vs Turnitin comparison, the main differences are the content searched and the settings chosen by the user, which can make one report show more matches than the other.
Can students buy iThenticate themselves?
Turnitin has offered individual iThenticate access in some markets, but most students reach it through their institution, supervisor or journal. Check your university’s policy before using any external checker on your thesis.
Does iThenticate check for AI-generated text?
iThenticate 2.0 includes AI writing detection for upgraded licenses, announced in November 2023. Whether a report shows it depends on the license held by the institution or publisher running the check.
Will my thesis match my journal article in iThenticate?
It may, if the thesis is online in a repository that the database indexes. Disclose the thesis to the editor and cite it; overlap with your own thesis is usually acceptable when it is transparent.
Which percentage is acceptable in iThenticate?
There is no universal threshold. Journals judge the location and nature of matches, such as methods wording versus results and discussion. Our guide to acceptable Turnitin similarity percentages explains how examiners read scores.
Sources
- Crossref. Similarity Check. https://www.crossref.org/services/similarity-check/ (accessed November 2026)
- Turnitin. (2023, November 1). Turnitin advances academic integrity with launch of iThenticate 2.0 and new Similarity Report. https://www.turnitin.co.uk/press/turnitin-advances-academic-integrity-with-launch-of-ithenticate-2-0-and-new-similarity-report (accessed November 2026)
- Turnitin. Understanding the similarity score. https://guides.turnitin.com/hc/en-us/articles/23435833938701 (accessed November 2026)
- UNSW Sydney, Conduct and Integrity Office. iThenticate. https://www.unsw.edu.au/assurance-integrity/conduct-integrity/research-integrity/responsible-conduct-research/IThenticate (accessed November 2026)
- Virginia Tech Graduate School. iThenticate. https://graduateschool.vt.edu/academics/ithenticate.html (accessed November 2026)
Sources last checked: November 2026. This article is general educational guidance and does not replace your university regulations or your supervisor’s instructions. How we prepare our content.