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Head-to-head · Code Transpilers

Kotlin/JS vs TeaVM

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Kotlin/JS #3 in Code Transpilers 8.8/10 Free plan Free plan✓ 3 of 4 features Visit Kotlin/JS
TeaVM #5 in Code Transpilers 8.6/10 Free plan Free plan✓ 2 of 4 features Visit TeaVM

Kotlin/JS leads on 0 checks, TeaVM 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 scoreKotlin/JS · 8.8/10
  • Free planboth
  • Most featuresKotlin/JS · 3 of 4

Kotlin/JS scores higher on our rubric for code transpilers: 8.8 against 8.6 out of 10; our editors rank them #3 and #5.

Kotlin/JS is the better fit for kotlin teams targeting browsers or Node.js. TeaVM is the better fit for java teams targeting JavaScript or WebAssembly.

  • Kotlin/JS fits best

    Kotlin teams targeting browsers or Node.js

  • TeaVM fits best

    Java teams targeting JavaScript or WebAssembly

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Side by side

Feature Kotlin/JS 8.8/10 Visit ↗ TeaVM 8.6/10 Visit ↗
At a glance
Editor score 8.8 8.6
Ranking #3 in Code Transpilers #5 in Code Transpilers
Best for Kotlin teams targeting browsers or Node.js Java teams targeting JavaScript or WebAssembly
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted Self-hosted
Support Community, Docs Email, Docs
Integrations 6 integrations 7 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Kotlin/JS 3/4 · TeaVM 2/4
Syntax-version conversion ✓ (best) Not checked yet
Intermediate output ✓ (best) Not checked yet
CLI access ✓ ✓
API access Not checked yet ✓ (best)
Specs
Source languages Not checked yet Not checked yet
Target languages Not checked yet Not checked yet
Conversion mode Source-to-source Source-to-source
Our review
Pros
  • 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
  • Compiles Java bytecode to JavaScript and Java or Kotlin to WebAssembly GC
  • Maven and Gradle integration with JavaScript interoperability
  • Includes source maps, debugging, development servers, and browser testing
Cons
  • Requires Kotlin code and compatible dependencies as input
  • Projects are configured through the Kotlin Multiplatform Gradle plugin
  • Support channels are community resources and documentation
  • Works within TeaVM’s supported Java API constraints
  • Focused on new web applications and selected code reuse, not every Java workload
  • Requires self-hosted deployment
Our verdict

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 →

TeaVM is an open-source ahead-of-time compiler for Java, Kotlin, and Scala developers who want to build web front ends or reuse selected backend code in browser applications. It compiles Java bytecode to JavaScript, supports Java and…

Read the review →
  1. Kotlin/JSCode Transpilers 8.8Free plan
  2. TeaVMCode Transpilers 8.6Free plan

Strengths and trade-offs

  • 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

  • TeaVM — where it wins

    • Compiles Java bytecode to JavaScript and Java or Kotlin to WebAssembly GC
    • Maven and Gradle integration with JavaScript interoperability
    • Includes source maps, debugging, development servers, and browser testing

    Where it doesn't

    • Works within TeaVM’s supported Java API constraints
    • Focused on new web applications and selected code reuse, not every Java workload
    • Requires self-hosted deployment

More comparisons

All code transpilers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update