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Head-to-head · Code Transpilers

ClojureScript vs Scala.js

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score ClojureScript #7 in Code Transpilers 8.4/10 Open source ✓ 2 of 4 features Visit ClojureScript
Scala.js #8 in Code Transpilers 8.3/10 Open source ✓ 3 of 4 features Visit Scala.js

ClojureScript leads on 0 checks, Scala.js on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreClojureScript · 8.4/10
  • Most featuresScala.js · 3 of 4

ClojureScript scores higher on our rubric for code transpilers: 8.4 against 8.3 out of 10; our editors rank them #7 and #8.

On conversion mode, Scala.js gives you Both where ClojureScript offers Source-to-source.

ClojureScript is the better fit for clojure teams targeting browser and Node.js. Scala.js is the better fit for scala teams building JavaScript applications.

  • ClojureScript fits best

    Clojure teams targeting browser and Node.js

  • Scala.js fits best

    Scala teams building JavaScript applications

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Side by side

Feature ClojureScript 8.4/10 Visit ↗ Scala.js 8.3/10 Visit ↗
At a glance
Editor score 8.4 8.3
Ranking #7 in Code Transpilers #8 in Code Transpilers
Best for Clojure teams targeting browser and Node.js Scala teams building JavaScript applications
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Self-hosted Self-hosted
Support Docs, Community Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features ClojureScript 2/4 · Scala.js 3/4
Syntax-version conversion Not checked yet Not checked yet
Intermediate output Not checked yet ✓ (best)
CLI access ✓ ✓
API access ✓ ✓
Specs
Source languages Not checked yet Not checked yet
Target languages Not checked yet Not checked yet
Conversion mode Source-to-source Both
Our review
Pros
  • Compiles Clojure to JavaScript with Google Closure-compatible output and optimization.
  • Supports browser, Node.js, Web Worker, and bundle targets.
  • Includes browser and Node.js REPLs, npm dependencies, macros, and source maps.
  • Incremental compilation supports iterative Scala-to-JavaScript builds
  • Dead-code elimination and linking help shape JavaScript output
  • Interop includes JavaScript libraries, React, AngularJS, Node.js, and Vite
Cons
  • The toolchain is centered on Clojure rather than multiple source languages.
  • Its feature set may be more than needed for projects that only require JavaScript.
  • Support channels are documentation and community.
  • Requires Scala source code, so it is not a general-purpose transpiler
  • Project workflows are commonly managed through build tools such as sbt
  • Support is through community channels and documentation
Our verdict

ClojureScript is an open-source compiler and programming language for building JavaScript applications from Clojure code. It is aimed at developers and teams who want to use Clojure’s functional language features for browser or…

Read the review →

Scala.js brings Scala into JavaScript application development by compiling Scala source files into JavaScript. It is aimed at teams that want to write application logic in Scala while targeting browsers, Node.js, or JavaScript modules. The…

Read the review →
  1. ClojureScriptCode Transpilers 8.4Open source
  2. Scala.jsCode Transpilers 8.3Open source

Strengths and trade-offs

  • ClojureScript — where it wins

    • Compiles Clojure to JavaScript with Google Closure-compatible output and optimization.
    • Supports browser, Node.js, Web Worker, and bundle targets.
    • Includes browser and Node.js REPLs, npm dependencies, macros, and source maps.

    Where it doesn't

    • The toolchain is centered on Clojure rather than multiple source languages.
    • Its feature set may be more than needed for projects that only require JavaScript.
    • Support channels are documentation and community.

  • Scala.js — where it wins

    • Incremental compilation supports iterative Scala-to-JavaScript builds
    • Dead-code elimination and linking help shape JavaScript output
    • Interop includes JavaScript libraries, React, AngularJS, Node.js, and Vite

    Where it doesn't

    • Requires Scala source code, so it is not a general-purpose transpiler
    • Project workflows are commonly managed through build tools such as sbt
    • Support is through community channels and documentation

More comparisons

All code transpilers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update