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Best Code Duplication Detection Tools in 2026

Code duplication detection tools find repeated or near-duplicate code so you can review clone patterns in a codebase. This guide is for developers choosing a tool based on language support, platform and integration needs.

  1. 1

    Avidemux

    Free plan Open source LinuxMacWeb+1
    9.3 Free plan Visit site
  2. 2

    Dolos

    Free plan Open source APILinuxMac+3

    Dolos focuses on similarities between source code submissions, with reports that show overlap at the file-pair level.

    9.0 Free plan Visit site
  3. 3

    jscpd

    Free plan Open source APILinuxMac+2

    jscpd combines repository-wide clone detection with build thresholds, reports, and developer workflow integrations.

    8.8 Open source Visit site
  4. 4

    dcd

    Free plan LinuxMac

    dcd offers several ways to detect, inspect, and export duplicate-code matches, including fuzzy matching and CI-oriented JSON.

    7.2 Free plan Visit site
  5. 5

    Duplo

    Free plan LinuxMacWindows

    Duplo combines language-aware duplicate checking with text-file scanning and several report formats. Check the quick-start threshold and license disclaimer against your intended use.

    7.2 Free plan Visit site
  6. 6

    Deckard

    Free plan APILinuxMac+2

    Choose Deckard if you need an open-source, script-driven tool for finding code clones and accessing clone data programmatically.

    7.1 Open source Visit site
  7. 7

    NiCad

    Free plan LinuxMacSelf-hosted+1

    NiCad offers configurable clone detection across several languages and analysis granularities. Check its OpenTxl and Turing+ requirements against your setup before choosing it.

    7.1 Free plan Visit site
  8. 8

    PMD

    Free plan LinuxMacSelf-hosted+1

    PMD combines broad language coverage, custom rules, and bundled duplicate detection without a listed price. Check language-specific rule coverage and version support before adopting it.

    7.0 Free plan Visit site
  9. 9

    phpcpd-next

    Free plan APILinuxSelf-hosted

    phpcpd-next offers several clone-detection modes and output formats, including options for CI workflows.

    6.9 Open source Visit site
  10. 10

    Simian Similarity Analyzer

    Free plan LinuxMacWindows

    Choose Simian if you need an open-source, configurable duplicate-code scanner that can run locally or in a build pipeline.

    6.8 Open source Visit site
  11. 11

    CCDetect-lsp

    Free plan LinuxMacWindows
    6.4 Free plan Visit site
  12. 12

    SourcererCC

    Free plan LinuxSelf-hosted

    SourcererCC offers configurable token-based clone detection across several code granularities. Plan for tokenization and multi-node result aggregation, and note the stated Mac limitation.

    6.3 Open source Visit site
  13. 13

    Fallow

    Free plan LinuxMacWeb+1
    6.2 Free plan · paid from $20/user/mo · 30-day trial Visit site
  14. 14

    JPlag

    Free plan LinuxMacWindows
    6.1 Free plan Visit site
  15. 15

    CCFinderX

    Free plan Linux
    6.0 Free plan Visit site
  16. 16

    art-dupl

    Paid

    art-dupl combines several clone-matching approaches with repository-level CI checks and reporting options. Its stated source-language scope is Go and .templ.

    5.2 Open source Visit site
  17. 17

    CloneDR

    Paid Windows
    4.4 Visit site
  18. 18

    Pattern Insight Clone Detection

    Paid Web
    4.0 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free access, paid pricing, language coverage, near-duplicate matching, CI or pull-request reporting, duplication gates and trend views. If you need to read or change the code, check the licence; also check free-plan limits, trial terms and supported platforms before choosing.

Questions

What is code duplication detection?

It is the process of finding repeated or near-duplicate code so you can review clone patterns and manage duplication.

Are free code duplication tools available?

Yes. Tools in this category offer free plans, and some are open source. Check the terms and licence for the tool you choose.

Which platforms can these tools run on?

The category includes Linux, macOS, Windows, self-hosted, API and web options. Confirm platform support for your setup.

What should I compare besides price?

Compare supported languages, near-duplicate detection, CI or pull-request reporting, duplication gates, trend visualisation and licence.

Does a tool support a free trial?

Trial terms vary. Fallow lists a 30-day trial; check the current terms for any tool before starting.

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