Deckard vs Dolos
Deckard
github.comDolos
dolos.ugent.beSide by side
| Figure | Deckard | Dolos |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 2 |
| Spec score · Code Duplication Detection Tools | 7.5 (#8) | 8.7 (#1) |
| Analysis | The README describes semantic clone analysis as a use of Deckard. | Its pipeline tokenizes source files, fingerprints token sequences, indexes matches, and generates reports. |
| Languages | The release notes describe support for C, Java 7, PHP 5, and Solidity syntax. | Dolos uses Tree-sitter parsers and supports common languages including Bash, C, C++, C#, Elm, JavaScript, Java, PHP, Python, and TypeScript out of the box. |
| Purpose | Deckard is a tree-based code clone detection tool that can also report clone-related bugs. | Dolos detects plagiarism by finding similarities between source code submissions. |
| Reports | The tool can convert clone or bug reports into HTML for inspection in a browser. | Reports include similarity, total overlap, and the longest matching fragment for file pairs. |
| Usage | Deckard runs through shell scripts in batch mode and can generate vectors for selected portions of a source file. | The web app accepts a ZIP of source files and automatically detects languages from file extensions, analyzing only the dominant language in mixed-language ZIPs unless a language is selected. |
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.