Deckard vs QuickDup
Deckard
github.comQuickDup
github.comSide by side
| Figure | Deckard | QuickDup |
|---|---|---|
| Price from | — | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 0 | 0 |
| Spec score · Code Clone Detection Tools | 7.5 (#12) | 6.9 (#20) |
| Installation | The README instructs users to build Deckard with a shell script in its src/main directory. | The README provides installer commands for Linux and macOS, a PowerShell installer for Windows, and installation from source with Go. |
| Languages | The release notes describe support for C, Java 7, PHP 5, and Solidity syntax. | The README lists comment-prefix support for languages including Go, C/C++, Java, JavaScript/TypeScript, C#, Python, Ruby, SQL, Lua, and others. |
| License | The repository license permits source and binary redistribution subject to its stated conditions and disclaims warranties. | QuickDup is released under the MIT License. |
| Performance | Version 2.0 supports parallel execution, with the maximum process count set through the MAX_PROCS configuration value. | The README reports scanning about 100,000 lines of code in about 500 ms on 8 cores. |
| Purpose | Deckard is a tree-based code clone detection tool that can also report clone-related bugs. | QuickDup is a structural code clone detector that finds duplicate code patterns using indent-delta fingerprinting and is designed to generate candidates for AI-assisted code review. |
In their own words
QuickDup
QuickDup is a repository code clone detector that finds candidate duplicate patterns using changes in indentation and the first word on each line. It skips comments and blank lines, tokenizes source lines and uses Jaccard similarity to filter patterns below a default 75% threshold. It does not parse abstract syntax trees. Detection options include normalized-indent, word-indent, word-only and inlineable strategies. The README lists comment-prefix detection for languages including Go, C and C++, Java, JavaScript and TypeScript, C#, Python, Ruby, SQL, Lua and MATLAB. QuickDup can emit GitHub Actions annotations for inline pull request comments and restrict them to files changed against a Git reference. Results are written as machine-readable JSON in a .quickdup directory. Incremental caching is available only for the word-indent strategy; other listed strategies re-parse files on each run. The README reports processing about 100,000 lines in about 500 ms on 8 cores. QuickDup is free under the MIT License, with installers for Linux, macOS and Windows, or installation from source with Go.