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Head-to-head · Code Transpilers

Babel vs Kotlin/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
Kotlin/JS #3 in Code Transpilers 8.8/10 Free plan Free plan✓ 3 of 4 features Visit Kotlin/JS

Babel leads on 0 checks, Kotlin/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 planboth
  • Most featuresBabel · 4 of 4

Babel scores higher on our rubric for code transpilers: 9.3 against 8.8 out of 10; our editors rank them #1 and #3.

On conversion mode, Babel gives you Both where Kotlin/JS offers Source-to-source.

Babel is the better fit for javaScript projects needing flexible transforms. Kotlin/JS is the better fit for kotlin teams targeting browsers or Node.js.

  • Babel fits best

    JavaScript projects needing flexible transforms

  • Kotlin/JS fits best

    Kotlin teams targeting browsers or Node.js

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 Babel 9.3/10 Visit ↗ Kotlin/JS 8.8/10 Visit ↗
At a glance
Editor score 9.3 8.8
Ranking #1 in Code Transpilers #3 in Code Transpilers
Best for JavaScript projects needing flexible transforms Kotlin teams targeting browsers or Node.js
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted, Browser extension Self-hosted
Platforms Web Web, Windows, macOS, Linux
Support Community, Docs Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Babel 4/4 · Kotlin/JS 3/4
Syntax-version conversion ✓ ✓
Intermediate output ✓ ✓
CLI access ✓ ✓
API access ✓ (best) Not checked yet
Specs
Source languages Not checked yet Not checked yet
Target languages Not checked yet Not checked yet
Conversion mode Both Source-to-source
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.
  • Compiles to ES5 and ES2015 for browser and Node.js targets
  • Supports npm packages, webpack, and JavaScript module interoperability
  • Generates TypeScript declarations and offers production minification
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 Kotlin code and compatible dependencies as input
  • Projects are configured through the Kotlin Multiplatform Gradle plugin
  • Support channels are community resources 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 →

Kotlin/JS is a source-to-source compiler and development toolchain for building browser and Node.js applications with Kotlin. It transpiles Kotlin code, the standard library, and compatible dependencies into JavaScript, with ES5 and ES2015…

Read the review →
  1. BabelCode Transpilers 9.3Free plan
  2. Kotlin/JSCode Transpilers 8.8Free plan

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.

  • Kotlin/JS — where it wins

    • Compiles to ES5 and ES2015 for browser and Node.js targets
    • Supports npm packages, webpack, and JavaScript module interoperability
    • Generates TypeScript declarations and offers production minification

    Where it doesn't

    • Requires Kotlin code and compatible dependencies as input
    • Projects are configured through the Kotlin Multiplatform Gradle plugin
    • Support channels are community resources 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