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QuickDup

Free#7 of 23 in Code Clone Detection Tools

QuickDup: An open-source candidate finder for reviewing likely code duplicates in pull requests. Ranked #7 of 23 in Code Clone Detection Tools by our editors (8.5/10); pricing: Open source; best for teams reviewing clones in GitHub pull requests.

8.5/10Editor score

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QuickDup8.5 Visit QuickDup

At a glance

Editor score
8.5 / 10
Pricing
Open source
Best for
Teams reviewing clones in GitHub pull requests
Paid from
Free
Clone detection method
Hybrid
Facts checked
20 Sep 2026

Where it wins
- Combines structural fingerprints with token-similarity scoring
- Adds Git diff, commit-range, caching, and threshold controls
- Publishes findings as GitHub Actions pull-request annotations
Where it doesn't
- No IDE integration
- Findings are candidates, not definitive semantic classifications
- Requires self-hosted command-line and CI setup

Our verdict on QuickDup

QuickDup is an open-source command-line tool for detecting likely code clones in source directories or individual files. It is aimed at developers and engineering teams that review duplication across repositories, particularly teams using GitHub pull requests and GitHub Actions. The tool runs on Windows, macOS, and Linux, and its repository is available under the MIT license. Its role is candidate discovery: findings are intended for review by people or AI features rather than treated as definitive semantic clone classifications.

Its detection approach combines indent-delta structural fingerprinting with first-token fingerprints and token-similarity scoring. Multiple detection strategies let teams examine duplication from different angles, while configurable similarity, occurrence, size, and ranking thresholds help narrow results. QuickDup can scan recursively or target a single file, ignore known patterns, and compare Git diffs or commit ranges. Incremental parsing cache is also included, which fits repeated repository checks and pull-request workflows. Together, these controls make the product more focused on configurable candidate generation than on a single fixed clone-detection method.

GitHub Actions is the central ecosystem connection: QuickDup can annotate pull requests, making findings available during code review and CI workflows. The published feature set does not include IDE integration, so teams wanting clone feedback directly inside an editor should consider a tool with that connection. QuickDup suits organizations comfortable with self-hosted, command-line workflows and human or AI review of candidates. It is less suitable for buyers seeking a hosted interface, built-in IDE support, or a semantic classifier that independently determines whether two code sections have the same meaning.

Your product? Our editors can test QuickDup in depth and publish a review, labelled as paid · from $149/mo →

QuickDup pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on github.com

QuickDup fact sheet

Free plan	Not verified
Paid from	Free
Clone detection method	Hybrid
Scan scope	Repository
CI integration	Yes
IDE integration	No
Self-hosted option	Yes
Supported languages	Not verified
Deployment	Self-hosted
Platforms	Windows, macOS, Linux
Support	Docs
Built for	Solo, Small business, Mid-market (editorial estimate)
Integrations	1 integrations: GitHub Actions
Pricing	Open source
Website	github.com
Facts checked	20 Sep 2026

QuickDup integrations

QuickDup lists 1 integrations on its own site.

GitHub Actions

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Featured on iTechGuides

QuickDup is listed in our Code Clone Detection Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update