Side by side
Copyscape vs Dolos
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.
Free plan APISelf-hostedWeb
Copyscape offers URL checks as well as paid options for document checks, batch searches, and monitoring. Treat AI detector results as one input rather than a sole basis for disciplinary decisions.
Visit Copyscape Free plan Open source APILinuxMac+3
Dolos focuses on similarities between source code submissions, with reports that show overlap at the file-pair level. Its web app, API, CLI, and self-hosting options give educators different ways to use it.
Visit DolosThe facts
| Copyscape | Dolos | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | No | Yes |
| Runs on | API, Self-hosted, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Copysentry Weekly protection: $4.95 a month | Free or on request |
| Plans published | 5 | 2 |
| Maker | Not published | Not published |
| Website | copyscape.com | dolos.ugent.be |
| On plagiarism checkers | #4 of 31 | #1 of 31 |
Copyscape: what it does well
- Free URL checker shows word-by-word comparisons.
- Premium accepts pasted text and PDF or Word uploads.
- Batch Search handles up to 10,000 pages per operation.
- Copysentry offers daily or weekly monitoring.
What to know first
- Free searches show up to 10 results.
- Free scans are limited per website.
- Premium searches are billed by word count.
- AI detector results can misclassify text.
Dolos: what it does well
- Free plan and MIT-licensed open-source software
- Reports show overlap and longest matching fragments
- Supports common programming languages through Tree-sitter
- Offers JSON API and local analysis options
- CSV listed as a report export format
What to know first
- Public API ZIP submissions are limited to 10 MB
- Mixed-language ZIPs analyze only the dominant language by default
- No academic source matching listed
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