Dolos suits teachers checking programming tests, exams, or exercises where limited collaboration is permitted.
Free plan Open source WebWindowsMacLinuxAPISelf-hosted
- Home
- Developer Tools
- Code Duplication Detection Tools
Best Code Duplication Detection Tools 2026
Facts read 27 Sep 2026 – 15 Oct 2026
Tools for detecting duplicate code surface repeated or closely resembling code early, before it propagates. They can support reviews, cleanup work, and checks in a build process.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Dolos | Dolos suits teachers checking programming tests, exams, or exercises where limited collaboration is permitted. | 5.6 | Free plan | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 02 Avidemux | 5.5 | Free plan | Free plan | Web, Windows, Mac, Linux | 7 Oct 2026 | |
| 03 jscpd | It suits developers who want to check repositories for duplicated code locally or in CI/CD. | 5.4 | Free plan | Free plan | Windows, Mac, Linux, API | 15 Oct 2026 |
| 04 Duplo | Duplo suits developers reviewing large repositories for repeated code, including teams that want duplicate checks in a build workflow. | 4.8 | Free plan | Free plan | Windows, Mac, Linux | 29 Sep 2026 |
| 05 NiCad | NiCad suits developers and teams that need to locate similar code across repositories and want control over comparison settings. | 4.8 | Free plan | Free plan | Windows, Mac, Linux, Self-hosted | 4 Oct 2026 |
| 06 PMD | PMD may suit developers and teams seeking a free code analyzer with customizable rules, command-line use, or build and CI integration. | 4.8 | Free plan | Free plan | Windows, Mac, Linux, Self-hosted | 2 Oct 2026 |
| 07 Simian Similarity Analyzer | Simian suits developers who want to locate duplicated text in repositories and run scans locally, from scripts, or in a build pipeline. | 4.8 | Free plan | Free plan | Windows, Mac, Linux | 30 Sep 2026 |
| 08 Deckard | Deckard suits developers or teams analyzing application source repositories for duplicated code. | 4.6 | Free plan | Free plan | Windows, Mac, Linux, API | 7 Oct 2026 |
| 09 dcd | 4.5 | Free plan | Free plan | Mac, Linux | 30 Sep 2026 | |
| 10 phpcpd-next | It suits PHP developers who want repository-wide clone detection and CI reporting. | 4.3 | Free plan | Free plan | Linux, API, Self-hosted | 5 Oct 2026 |
Use this finder to assess free and paid availability, language coverage, clone matching, CI or pull-request output, duplication thresholds, trend views, and open-source availability. Entries are presented for comparison rather than scored.
02
Avidemux
WebWindowsMac+1 Record5.5 Visit
03
jscpd
It suits developers who want to check repositories for duplicated code locally or in CI/CD.
WindowsMacLinux+2 Record5.4 Visit
04
Duplo
Duplo suits developers reviewing large repositories for repeated code, including teams that want duplicate checks in a build workflow.
WindowsMacLinux Record4.8 Visit
05
NiCad
NiCad suits developers and teams that need to locate similar code across repositories and want control over comparison settings.
WindowsMacLinux+1 Record4.8 Visit
6
PMD
WindowsMacLinux+1 Free plan Record4.8 Visit PMD may suit developers and teams seeking a free code analyzer with customizable rules, command-line use, or build and CI integration.
7
Simian Similarity Analyzer
WindowsMacLinux Free plan Record4.8 Visit Simian suits developers who want to locate duplicated text in repositories and run scans locally, from scripts, or in a build pipeline.
8
Deckard
WindowsMacLinux+2 Free plan Record4.6 Visit Deckard suits developers or teams analyzing application source repositories for duplicated code.
10
phpcpd-next
LinuxAPISelf-hosted Free plan Record4.3 Visit It suits PHP developers who want repository-wide clone detection and CI reporting.
Before you choose
Assess pricing options
A free plan can help you evaluate a tool before committing budget. Check whether the free option matches your codebase and workflow.
Fallow shows free access, a paid tier beginning at $20 per user monthly, and a 30-day trial.
Match supported languages
Confirm that a tool supports the languages in your repositories. art-dupl detects code clones in Go source code.
Language coverage is a key comparison point when projects use more than one language.
Check delivery and gates
If checks should accompany code changes, see whether the tool reports through CI or pull requests. A duplication gate may define the threshold a change must meet.
A tool with API or web access may fit a hosted workflow, while self-hosted software can suit teams that manage their own environment.
Check where it runs
Review platform support before setup. Listed possibilities include Linux, macOS, Windows, self-hosted deployments, APIs, and web access.
CloneDR lists Windows support. Confirm the current platform details for the tool you plan to use.
Review open-source terms
The category includes open-source choices such as art-dupl, Deckard, and jscpd. Read the licence before changing code or embedding a tool in a product.
Compare licence terms with your project requirements and preferred maintenance model.
Questions
What is the purpose of a code duplication detection tool?
It spots repeated or closely matching code, allowing you to review the duplication and decide whether to modify it.
Can I try a tool without paying?
Yes. Items on this list include free plans. Fallow also shows a paid tier and a 30-day trial.
Are open-source options available?
Yes. The listed open-source choices include art-dupl, Deckard, and jscpd.
What platforms are available for these tools?
The list represents Linux, macOS, Windows, self-hosted deployments, APIs, and web access.
What should I compare besides price?
Review supported languages, near-duplicate detection, CI or pull-request reporting, duplication gates, trend visualisation, and licence options.
More in Developer Tools
Accessibility Testing Software 169Log Management Software 111AI Coding Assistants 103Package Managers 93AI Agent Platforms 73Reverse Engineering Tools 73Integrated Development Environments 65Software Composition Analysis Software 65Artifact repository software 64Browser Automation Tools 62Version Control Software 62Container Registries 60Code Playground Software 58Continuous Integration Software 58Network Monitoring 55Kubernetes Monitoring 54Database Client Software 53IDE Software 53