- iThenticate reports: Generate similarity scores and highlighted text matches against scholarly and web content.
- Publisher corpus: Participating members contribute current and archival full text to the comparison database.
- Submission options: Upload manuscripts in iThenticate or use a supported manuscript-system API.
- Unlimited organizational users: The member service includes unlimited users within the participating organization.
- Member eligibility: Access requires active DOI publishing and suitable full-text URLs in Crossref metadata.
Crossref Similarity Check
Crossref member access to iThenticate similarity reports
Updated August 2, 2026
Crossref Similarity Check Overview
Crossref Similarity Check gives eligible Crossref members reduced-rate access to Turnitin’s iThenticate comparison service. Participating publishers contribute links to their published full text, then submit manuscripts through iThenticate or a supported submission-system API. A similarity report highlights matching passages for editorial review; it does not by itself determine whether plagiarism occurred.
Key Features
Pricing
| Offer | Current price | Billing and scope |
|---|---|---|
| Annual Similarity Check service fee | $40 to $10,000 per year | 20% of the member's annual Crossref membership fee; tier depends on publishing revenue or expenses |
| 1-100 documents per year | $0 per document | Documents up to 25,000 words |
| 101-2,000 documents per year | $0.75 per document | Documents up to 25,000 words |
| 2,001-25,000 documents per year | $0.65 per document | Documents up to 25,000 words |
| 25,001-50,000 documents per year | $0.55 per document | Documents up to 25,000 words |
| 50,001-100,000 documents per year | $0.45 per document | Documents up to 25,000 words |
| 100,001-200,000 documents per year | $0.30 per document | Documents up to 25,000 words |
| More than 200,001 documents per year | $0.25 per document | Documents up to 25,000 words; threshold wording follows the official table |
Participation also requires Crossref membership and active DOI publishing with full-text URLs. The annual service fee tiers run from $40 to $10,000 because the fee is 20% of the member's separate $200-$50,000 membership fee.
Pricing source: https://www.crossref.org/fees/#similarity-check-fees
Pros
- Scholarly focus: The service is designed for editorial screening against published academic content.
- Transparent formula: Crossref publishes annual and per-document fee rules.
- Workflow integration: Eligible publishers can connect checks to manuscript-submission systems.
Cons
- Membership required: Independent users cannot buy this Crossref service without qualifying membership and publishing activity.
- Two-part cost: Organizations pay an annual service fee plus volume-based document charges.
- Human judgment required: A similarity score flags overlap but does not establish plagiarism on its own.
