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TeaVM review

Free#5 of 28 in Code Transpilers

A free, open-source compiler for Java teams building browser applications or native targets.

8.6/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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 Kotlin compilation to WebAssembly GC, and can generate C source for native compilation. The project is especially relevant to Java teams targeting JavaScript or WebAssembly, rather than developers looking for a general-purpose compiler for every Java application.

Its build and browser tooling make the output more practical to work with: TeaVM integrates with Maven and Gradle, offers JavaScript interoperability and browser API wrappers, and generates JavaScript and WebAssembly modules. Source maps and debugging support, development servers, and JUnit-based browser and WebAssembly testing are also included. These capabilities suit teams that want to stay in familiar Java build workflows while developing browser-facing code. TeaVM is self-hosted, so teams should account for managing it within their own environment.

TeaVM is free and open source under the Apache License 2.0. The project is designed for new web applications and code that fits within its supported Java API constraints, which is an important boundary for teams considering reuse of existing code. Choose it when compiling Java-family code for browser or WebAssembly targets is central to the project; consider another approach if the workload depends on Java APIs outside those constraints or does not involve these targets. Support channels include documentation and email.

TeaVM pros and cons

  • 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

TeaVM fact sheet, pricing and score →

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