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Tech riderRev. 20 Sept 2026

QuickDup

Ch 116.8of 23 Code Clone Detection Tools
  1. 1Runs onLinux, Mac, Windows
  2. 2CostsNot stated by the maker
  3. 3Clone detection methodhybrid
  4. 4Scan scoperepository
  5. 5CI integrationYes
  6. 6IDE integrationNo
  7. 7Self-hosted optionYes
6 lines stated Written from the maker's own pages: github.com
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The QuickDup homepage

Overview

QuickDup is ranked #11 of 23 in code clone detection tools on Specifiction. It runs on Linux, macOS, Windows.

Compared on code clone detection tools

Clone detection method
hybridgithub.com
Scan scope
repositorygithub.com
CI integration
Yesgithub.com
IDE integration
Nogithub.com
Self-hosted option
Yesgithub.com

Facts

Purpose
QuickDup is a structural code clone detector that finds duplicate code patterns using indent-delta fingerprinting.github.com · 4 Oct 2026
Intended use
It is designed to generate candidate duplicates for AI-assisted code review, with an AI agent and human decision maker verifying candidates.github.com · 4 Oct 2026
Performance
The README reports processing about 100,000 lines of code in about 500 ms on 8 cores.github.com · 4 Oct 2026
Detection approach
QuickDup fingerprints indentation changes and the first word on each line, and does not use AST parsing.github.com · 4 Oct 2026
Detection strategies
It offers normalized-indent, word-indent, word-only, and inlineable detection strategies.github.com · 4 Oct 2026
Language support
The README lists comment-prefix detection for languages including Go, C#, JavaScript, TypeScript, Python, Ruby, SQL, Lua, and MATLAB, among others.github.com · 4 Oct 2026
GitHub integration
QuickDup can emit GitHub Actions annotations for inline pull request comments and limit annotations to files changed against a Git reference.github.com · 4 Oct 2026
Output
Scan results are written as machine-readable JSON files in a .quickdup directory.github.com · 4 Oct 2026
Caching
Incremental caching is available only for the word-indent strategy; the other listed strategies re-parse files on each run.github.com · 4 Oct 2026
Limitations
The README describes QuickDup as a heuristic candidate generator that can produce false positives and miss semantically duplicate code with different structure.github.com · 4 Oct 2026
License
The repository lists the software under the MIT License.github.com · 4 Oct 2026
Installation
The README provides installer commands for Linux and macOS, a PowerShell installer for Windows, and installation from source with Go.github.com · 4 Oct 2026
How it works
It fingerprints indentation changes and the first word on each line, skips comments and blank lines, and detects patterns without AST parsing.github.com · 5 Oct 2026
Similarity filtering
QuickDup tokenizes source lines, computes Jaccard similarity, and filters patterns below a default similarity threshold of 75%.github.com · 5 Oct 2026
Languages
The README lists comment-prefix support for languages including Go, C/C++, Java, JavaScript/TypeScript, C#, Python, Ruby, SQL, Lua, and others.github.com · 5 Oct 2026
GitHub Actions integration
It can emit GitHub Actions annotations for inline pull request comments and can limit annotations to files changed against a Git reference.github.com · 5 Oct 2026
Caching limit
Incremental parsed-file caching is supported only by the word-indent strategy; the other listed strategies re-parse files on each run.github.com · 5 Oct 2026
Release
The GitHub releases page lists v0.6.0 as the latest release.github.com · 5 Oct 2026
Maker location
The maker's GitHub organization profile lists Stockholm, Sweden.github.com · 5 Oct 2026

Company

Headquarters
Huddinge, Swedengithub.com · 28 Sept 2026

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Sources