Codeleaks vs Dolos
Codeleaks
copyleaks.comDolos
dolos.ugent.beSide by side
| Figure | Codeleaks | Dolos |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 2 |
| Spec score · Plagiarism Detection Software | 7.6 (#21) | 9.0 (#5) |
| Headquarters | New York, NY, United States | Ghent, Belgium |
| Purpose | Codeleaks helps development teams identify code origins and licensing requirements to prevent licensed or non-compliant code from entering products. | Dolos detects plagiarism by finding similarities between source code submissions. |
| Support | The Codeleaks page says a dedicated account manager supports onboarding and integration. | General questions and support are handled through GitHub discussions, while bugs and feature requests use GitHub issues. |
| Supported languages | Listed languages are Ruby, JavaScript, CSS, Markdown, TypeScript, Python, C++, C, Java, C#, and PHP. | Built-in parsers cover Bash, C, C++, C#, Elm, JavaScript, Java, PHP, Python and TypeScript, with additional Tree-sitter languages possible. |
Plans
In their own words
Dolos
Dolos is a free, open-source tool for finding similarities between source-code submissions, particularly for teachers reviewing tests, exams, and exercises where collaboration may be allowed in small groups. Its analysis process tokenizes files, fingerprints token sequences, indexes matches, and produces reports. For each file pair, reports include similarity, total overlap, and the longest matching fragment. Dolos uses Tree-sitter parsers and supports languages including Bash, C, C++, C#, Elm, JavaScript, Java, PHP, Python, and TypeScript. The web app accepts ZIP files and detects languages from file extensions; in mixed-language archives, it analyzes only the dominant language unless a language is selected. Its public API accepts ZIP submissions up to 10 MB, with the CLI or library recommended for larger submissions. Analyses can also run locally, with results displayed in a browser, or on a self-hosted server. The free web app is hosted on Ghent University servers in Belgium. Dolos provides a JSON API for integrations such as Dodona and lists CSV as a report export format.