Side by side
Crossref Similarity Check vs Scribbr Plagiarism Checker
Both stand on plagiarism checkers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Paid APIWeb
Similarity Check offers manuscript comparison and editorial reports for qualifying Crossref members. Its membership and metadata requirements, annual fee, and regional restriction matter when assessing eligibility.
Visit Crossref Similarity Check
Free plan Web
Scribbr offers a free initial report and detailed paid reports for academic checks, with support for multiple languages and file formats. Keep its private-database limitation in mind when comparing results with a university check.
Visit Scribbr Plagiarism CheckerThe facts
| Crossref Similarity Check | Scribbr Plagiarism Checker | |
|---|---|---|
| Free plan | No | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | Web |
| Lowest paid plan | See the plans | See the plans |
| Plans published | 2 | 3 |
| Maker | Not published | Not published |
| Website | crossref.org | scribbr.com |
| On plagiarism checkers | #25 of 31 | #21 of 31 |
Crossref Similarity Check: what it does well
- Compares manuscripts with academic and general web content.
- Reports highlight matching text and provide a Similarity Score.
- Manuscripts can be submitted through an API.
- First 100 yearly checks are free, up to 25,000 words each.
What to know first
- Participation requires Crossref membership and qualifying publishing activity.
- Annual service fee depends on the membership fee tier.
- Unavailable to members based in Russia.
Scribbr Plagiarism Checker: what it does well
- Free report includes risk assessment and top matches.
- Supports 20 languages and four file formats.
- Paid report includes side-by-side comparison and writing corrections.
- Documents can be deleted before the one-year removal point.
- Email and live chat support are listed.
What to know first
- Free report is limited.
- Private student-paper databases are not accessible.
- Paid checks are billed per document, not by subscription.
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