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Head-to-head · Code Duplication Detection Tools

jscpd vs Fallow

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score jscpd #1 in Code Duplication Detection Tools 8.8/10 Open source ✓ 1 of 4 features Visit jscpd
Fallow #4 in Code Duplication Detection Tools 6.9/10 Free plan · 30-day trial Free planFree trial✓ 3 of 4 features Visit Fallow

jscpd leads on 0 checks, Fallow on 0, and 4 are even. Who comes out ahead on the 4 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 Fallow
  • Free trialonly Fallow
  • Most featuresFallow · 3 of 4

jscpd scores higher on our rubric for code duplication detection tools: 8.8 against 6.9 out of 10; our editors rank them #1 and #4.

jscpd is the better fit for teams needing broad, CI-ready clone analysis. Fallow is the better fit for small teams enforcing duplication gates in CI.

  • jscpd fits best

    Teams needing broad, CI-ready clone analysis

  • Fallow fits best

    Small teams enforcing duplication gates in CI

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature jscpd 8.8/10 Visit ↗ Fallow 6.9/10 Visit ↗
At a glance
Editor score 8.8 6.9
Ranking #1 in Code Duplication Detection Tools #4 in Code Duplication Detection Tools
Best for Teams needing broad, CI-ready clone analysis Small teams enforcing duplication gates in CI
Pricing model Free Free plan + paid
Starting price Open source $20/seat/mo
Free plan Not checked yet ✓ (best)
Free trial — 30 days
Deployment Self-hosted Cloud, Self-hosted, Browser extension
Platforms Windows, macOS, Linux Web, Windows, macOS, Linux
Support Docs Email, Community, Docs
Integrations 3 integrations 4 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features jscpd 1/4 · Fallow 3/4
Near-duplicate detection Not checked yet ✓ (best)
Duplication gates Not checked yet ✓ (best)
Trend visualisation Not checked yet Not checked yet
Open-source option ✓ ✓
Specs
Supported languages Not checked yet 2
CI/PR reporting Not checked yet Pull_request
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
  • Free MIT scan runs in the terminal, CI, VS Code, and coding agents
  • Baseline and changed-since analysis can focus CI checks on new duplication
  • Multiple detection modes, near-miss analysis, and CI output formats
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
  • Analysis is limited to TypeScript and JavaScript projects
  • Near-miss detection is limited to function-scoped clones with small structural edits
  • Production function-call data requires the separate paid Runtime service
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 →

Fallow is a codebase analysis tool for TypeScript and JavaScript projects, suited to developers and teams who want duplication checks in their everyday workflow or CI. Its free MIT scan detects duplicated code alongside dead code,…

Read the review →
  1. jscpdCode Duplication Detection Tools 8.8Open source
  2. FallowCode Duplication Detection Tools 6.9Free plan · 30-day trial

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

  • Fallow — where it wins

    • Free MIT scan runs in the terminal, CI, VS Code, and coding agents
    • Baseline and changed-since analysis can focus CI checks on new duplication
    • Multiple detection modes, near-miss analysis, and CI output formats

    Where it doesn't

    • Analysis is limited to TypeScript and JavaScript projects
    • Near-miss detection is limited to function-scoped clones with small structural edits
    • Production function-call data requires the separate paid Runtime service
  • jscpd8.8/10 · Open source

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

    Visit jscpdFull verdict →
  • Fallow6.9/10 · Free plan · 30-day trial

    A free TypeScript and JavaScript duplication scanner with CI gates and optional paid runtime insights.

    Visit FallowFull 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