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Head-to-head · Code Transpilers

SWC vs Kotlin/JS

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score SWC #2 in Code Transpilers 9.2/10 Free plan Free plan✓ 0 of 4 features Visit SWC
Kotlin/JS #3 in Code Transpilers 8.8/10 Free plan Free plan✓ 3 of 4 features Visit Kotlin/JS

SWC leads on 0 checks, Kotlin/JS 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 scoreSWC · 9.2/10
  • Free planboth
  • Most featuresKotlin/JS · 3 of 4

SWC scores higher on our rubric for code transpilers: 9.2 against 8.8 out of 10; our editors rank them #2 and #3.

SWC is the better fit for fast JavaScript and TypeScript build pipelines. Kotlin/JS is the better fit for kotlin teams targeting browsers or Node.js.

  • SWC fits best

    Fast JavaScript and TypeScript build pipelines

  • Kotlin/JS fits best

    Kotlin teams targeting browsers or Node.js

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Side by side

Feature SWC 9.2/10 Visit ↗ Kotlin/JS 8.8/10 Visit ↗
At a glance
Editor score 9.2 8.8
Ranking #2 in Code Transpilers #3 in Code Transpilers
Best for Fast JavaScript and TypeScript build pipelines Kotlin teams targeting browsers or Node.js
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted Self-hosted
Platforms Windows, macOS, Linux, Android Web, Windows, macOS, Linux
Support Community, Docs Community, Docs
Integrations 6 integrations 6 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features SWC 0/4 · Kotlin/JS 3/4
Syntax-version conversion Not checked yet ✓ (best)
Intermediate output Not checked yet ✓ (best)
CLI access Not checked yet ✓ (best)
API access Not checked yet Not checked yet
Specs
Source languages Not checked yet Not checked yet
Target languages Not checked yet Not checked yet
Conversion mode Not checked yet Source-to-source
Our review
Pros
  • Compiles JavaScript and TypeScript, with minification and source maps
  • Supports tree shaking, dead-code elimination, and shared-dependency chunking
  • Integrates with Next.js, webpack, Rspack, Jest, Parcel, and Deno
  • 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
  • The spack bundler is documented as slated for removal in v2
  • Bundling depends on spack, so its future path warrants attention
  • Support channels are community and documentation
  • 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

SWC is an open-source, Rust-based compiler and build tool for JavaScript and TypeScript projects. It transforms modern code into browser-compatible output and offers minification, source maps, tree shaking, and bundling through its spack…

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. SWCCode Transpilers 9.2Free plan
  2. Kotlin/JSCode Transpilers 8.8Free plan

Strengths and trade-offs

  • SWC — where it wins

    • Compiles JavaScript and TypeScript, with minification and source maps
    • Supports tree shaking, dead-code elimination, and shared-dependency chunking
    • Integrates with Next.js, webpack, Rspack, Jest, Parcel, and Deno

    Where it doesn't

    • The spack bundler is documented as slated for removal in v2
    • Bundling depends on spack, so its future path warrants attention
    • Support channels are community and documentation

  • 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