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Head-to-head · Code Transpilers

Babel vs Scala.js

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Babel #1 in Code Transpilers 9.3/10 Free plan Free plan✓ 4 of 4 features Visit Babel
Scala.js #8 in Code Transpilers 8.3/10 Open source ✓ 3 of 4 features Visit Scala.js

Babel leads on 0 checks, Scala.js 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 scoreBabel · 9.3/10
  • Free planonly Babel
  • Most featuresBabel · 4 of 4

Babel scores higher on our rubric for code transpilers: 9.3 against 8.3 out of 10; our editors rank them #1 and #8.

Babel is the better fit for javaScript projects needing flexible transforms. Scala.js is the better fit for scala teams building JavaScript applications.

  • Babel fits best

    JavaScript projects needing flexible transforms

  • Scala.js fits best

    Scala teams building JavaScript applications

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Side by side

Feature Babel 9.3/10 Visit ↗ Scala.js 8.3/10 Visit ↗
At a glance
Editor score 9.3 8.3
Ranking #1 in Code Transpilers #8 in Code Transpilers
Best for JavaScript projects needing flexible transforms Scala teams building JavaScript applications
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted, Browser extension Self-hosted
Support Community, Docs Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Babel 4/4 · Scala.js 3/4
Syntax-version conversion ✓ (best) Not checked yet
Intermediate output ✓ ✓
CLI access ✓ ✓
API access ✓ ✓
Specs
Source languages Not checked yet Not checked yet
Target languages Not checked yet Not checked yet
Conversion mode Both Both
Our review
Pros
  • Plugin- and preset-based pipelines support configurable syntax transforms.
  • Offers CLI, Node.js APIs, source maps, and AST tooling.
  • Open source, with polyfill integration and browser-based compilation.
  • 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
  • Configuration depends on selecting and combining plugins or presets.
  • Support channels are community resources and documentation.
  • The project is distributed as a collection of npm packages.
  • 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

Babel is an open-source JavaScript compiler and toolchain for developers who need to transform modern ECMAScript syntax for current or older browsers and other environments. Its audience includes solo developers and teams of different…

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. BabelCode Transpilers 9.3Free plan
  2. Scala.jsCode Transpilers 8.3Open source

Strengths and trade-offs

  • Babel — where it wins

    • Plugin- and preset-based pipelines support configurable syntax transforms.
    • Offers CLI, Node.js APIs, source maps, and AST tooling.
    • Open source, with polyfill integration and browser-based compilation.

    Where it doesn't

    • Configuration depends on selecting and combining plugins or presets.
    • Support channels are community resources and documentation.
    • The project is distributed as a collection of npm packages.

  • 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
  • Babel9.3/10 · Free plan

    Flexible ECMAScript transforms with CLI, Node.js APIs, and browser compilation.

    Visit BabelFull verdict →
  • Scala.js8.3/10 · Open source

    An open-source Scala-to-JavaScript toolchain with incremental builds and JavaScript interoperability.

    Visit Scala.jsFull verdict →

More comparisons

All code transpilers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update