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Head-to-head · Code Duplication Detection Tools

jscpd vs Simian Similarity Analyzer

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score jscpd #1 in Code Duplication Detection Tools 8.8/10 Open source ✓ 1 of 4 features Visit jscpd
Simian Similarity Analyzer #7 in Code Duplication Detection Tools 6.6/10 Open source Free plan✓ 3 of 4 features Visit Simian

jscpd leads on 0 checks, Simian Similarity Analyzer on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorejscpd · 8.8/10
  • Free planonly Simian Similarity Analyzer
  • Most featuresSimian Similarity Analyzer · 3 of 4

jscpd scores higher on our rubric for code duplication detection tools: 8.8 against 6.6 out of 10; our editors rank them #1 and #7.

jscpd is the better fit for teams needing broad, CI-ready clone analysis. Simian Similarity Analyzer is the better fit for broad-language duplicate checks in build pipelines.

  • jscpd fits best

    Teams needing broad, CI-ready clone analysis

  • Simian Similarity Analyzer fits best

    Broad-language duplicate checks in build pipelines

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Side by side

Feature jscpd 8.8/10 Visit ↗ Simian Similarity Analyzer 6.6/10 Visit ↗
At a glance
Editor score 8.8 6.6
Ranking #1 in Code Duplication Detection Tools #7 in Code Duplication Detection Tools
Best for Teams needing broad, CI-ready clone analysis Broad-language duplicate checks in build pipelines
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Self-hosted Self-hosted
Platforms Windows, macOS, Linux Windows, macOS, Linux
Support Docs Email, Community, Docs
Integrations 3 integrations 1 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features jscpd 1/4 · Simian Similarity Analyzer 3/4
Near-duplicate detection Not checked yet ✓ (best)
Duplication gates Not checked yet ✓ (best)
Trend visualisation Not checked yet —
Open-source option ✓ ✓
Specs
Supported languages Not checked yet 19
CI/PR reporting Not checked yet Ci
Our review
Pros
  • Finds exact, renamed, and near-miss clones across 224 formats
  • Runs in CI through GitHub Actions or Docker, with SARIF output
  • Adds duplication trends, dead-code checks, and complexity analysis
  • Supports 19 languages and near-duplicate matching
  • Configurable thresholds plus include and exclude file filters
  • Gradle and build-pipeline integration with duplication failure gates
Cons
  • Command-line workflow may not suit teams seeking a hosted interface
  • Configuration and report review are managed by the team
  • Documentation is the listed support channel
  • Command-line workflow may not suit teams seeking a visual interface
  • No trend visualisation is provided
  • Self-hosted deployment requires teams to manage the runtime
Our verdict

jscpd is an open-source command-line tool that scans repositories for duplicated source-code blocks. It tokenizes files according to language-specific syntax to detect exact, renamed, and near-miss clones, making it relevant to developers…

Read the review →

Simian Similarity Analyzer is an open-source, language-agnostic command-line tool for finding duplicated blocks in source code and other human-readable files. It is aimed at teams that need duplicate checks across large codebases, from…

Read the review →
  1. jscpdCode Duplication Detection Tools 8.8Open source
  2. Simian Similarity AnalyzerCode Duplication Detection Tools 6.6Open source

Strengths and trade-offs

  • jscpd — where it wins

    • Finds exact, renamed, and near-miss clones across 224 formats
    • Runs in CI through GitHub Actions or Docker, with SARIF output
    • Adds duplication trends, dead-code checks, and complexity analysis

    Where it doesn't

    • Command-line workflow may not suit teams seeking a hosted interface
    • Configuration and report review are managed by the team
    • Documentation is the listed support channel

  • Simian Similarity Analyzer — where it wins

    • Supports 19 languages and near-duplicate matching
    • Configurable thresholds plus include and exclude file filters
    • Gradle and build-pipeline integration with duplication failure gates

    Where it doesn't

    • Command-line workflow may not suit teams seeking a visual interface
    • No trend visualisation is provided
    • Self-hosted deployment requires teams to manage the runtime
  • jscpd8.8/10 · Open source

    A self-hosted, open-source clone analyzer with broad format support and CI reporting.

    Visit jscpdFull verdict →
  • Simian Similarity Analyzer6.6/10 · Open source

    A configurable, language-agnostic duplicate checker for build pipelines.

    Visit SimianFull verdict →

More comparisons

All code duplication detection tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update