QuickDup

6.5easy start · #9 of 23
in Code Clone Detection Tools

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Linux, Mac, Windows.

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QuickDup is ranked #9 of 23 in code clone detection tools on The Geeks Club. It runs on Linux, macOS, Windows.

Compared on code clone detection tools

Clone detection method: hybrid
Scan scope: repository
CI integration: Yes
IDE integration: No
Self-hosted option: Yes

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The record

Purpose: QuickDup is a structural code clone detector that finds duplicate code patterns using indent-delta fingerprinting.
Intended use: It is designed to generate candidate duplicates for AI-assisted code review, with an AI agent and human decision maker verifying candidates.
Performance: The README reports processing about 100,000 lines of code in about 500 ms on 8 cores.
Detection approach: QuickDup fingerprints indentation changes and the first word on each line, and does not use AST parsing.
Detection strategies: It offers normalized-indent, word-indent, word-only, and inlineable detection strategies.
Language support: The README lists comment-prefix detection for languages including Go, C#, JavaScript, TypeScript, Python, Ruby, SQL, Lua, and MATLAB, among others.
GitHub integration: QuickDup can emit GitHub Actions annotations for inline pull request comments and limit annotations to files changed against a Git reference.
Output: Scan results are written as machine-readable JSON files in a .quickdup directory.
Caching: Incremental caching is available only for the word-indent strategy; the other listed strategies re-parse files on each run.
Limitations: The README describes QuickDup as a heuristic candidate generator that can produce false positives and miss semantically duplicate code with different structure.
License: The repository lists the software under the MIT License.
Installation: The README provides installer commands for Linux and macOS, a PowerShell installer for Windows, and installation from source with Go.
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.
Similarity filtering: QuickDup tokenizes source lines, computes Jaccard similarity, and filters patterns below a default similarity threshold of 75%.

Where it ranks on The Geeks Club

Best Code Clone Detection Tools in 2026#9 of 23

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Sources

github.com/asynkron/Asynkron.QuickDup· checked 4 Oct 2026
github.com/asynkron/Asynkron.QuickDup/releases· checked 5 Oct 2026
github.com/asynkron· checked 5 Oct 2026