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Head-to-head · Code Duplication Detection Tools

Fallow vs art-dupl

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Fallow #4 in Code Duplication Detection Tools 6.9/10 Free plan · 30-day trial Free planFree trial✓ 3 of 4 features Visit Fallow
art-dupl #5 in Code Duplication Detection Tools 6.8/10 Open source ✓ 1 of 4 features Visit art-dupl

Fallow leads on 0 checks, art-dupl 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 scoreFallow · 6.9/10
  • Free planonly Fallow
  • Free trialonly Fallow
  • Most featuresFallow · 3 of 4

Fallow scores higher on our rubric for code duplication detection tools: 6.9 against 6.8 out of 10; our editors rank them #4 and #5.

Fallow is the better fit for small teams enforcing duplication gates in CI. art-dupl is the better fit for go teams wanting AST-based CI checks.

  • Fallow fits best

    Small teams enforcing duplication gates in CI

  • art-dupl fits best

    Go teams wanting AST-based CI checks

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 Fallow 6.9/10 Visit ↗ art-dupl 6.8/10 Visit ↗
At a glance
Editor score 6.9 6.8
Ranking #4 in Code Duplication Detection Tools #5 in Code Duplication Detection Tools
Best for Small teams enforcing duplication gates in CI Go teams wanting AST-based CI checks
Pricing model Free plan + paid Free
Starting price $20/seat/mo Open source
Free plan ✓ (best) Not checked yet
Free trial 30 days —
Deployment Cloud, Self-hosted, Browser extension Self-hosted
Support Email, Community, Docs Docs, Community
Integrations 4 integrations 3 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Fallow 3/4 · art-dupl 1/4
Near-duplicate detection ✓ (best) Not checked yet
Duplication gates ✓ (best) Not checked yet
Trend visualisation Not checked yet Not checked yet
Open-source option ✓ ✓
Specs
Supported languages 2 Not checked yet
CI/PR reporting Pull_request Not checked yet
Our review
Pros
  • 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
  • Semantic, exact, and structural matching for clone detection
  • Baselines flag newly introduced clones in CI
  • Reports include SARIF, metrics, and health grades
Cons
  • 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
  • Source analysis is limited to Go and Templ
  • Deployment is self-hosted rather than managed
  • Support is through documentation and community
Our verdict

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 →

art-dupl is an open-source command-line tool for finding duplicated code in Go and Templ projects. It suits developers and teams that want repository scans on their own machines or automated checks in CI/CD. Its AST-based approach compares…

Read the review →
  1. FallowCode Duplication Detection Tools 6.9Free plan · 30-day trial
  2. art-duplCode Duplication Detection Tools 6.8Open source

Strengths and trade-offs

  • 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

  • art-dupl — where it wins

    • Semantic, exact, and structural matching for clone detection
    • Baselines flag newly introduced clones in CI
    • Reports include SARIF, metrics, and health grades

    Where it doesn't

    • Source analysis is limited to Go and Templ
    • Deployment is self-hosted rather than managed
    • Support is through documentation and community
  • 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 →
  • art-dupl6.8/10 · Open source

    A self-hosted Go and Templ duplication checker with AST matching and CI workflows.

    Visit art-duplFull 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