Best Scala.js Alternatives in 2026
Updated
20 platforms from code transpilers ranked against Scala.js on the same published basis.
- 1Scala.js vs ClojureScript
- 2Scala.js vs Google Web Toolkit
- 3Scala.js vs Kotlin/JS
- 4Scala.js vs Cython
- 6Scala.js vs SWC
- 7Scala.js vs Transcrypt
- 8Scala.js vs Babel
- 9Scala.js vs Vala
- 10Scala.js vs CoffeeScript
- 11Scala.js vs Dart pub
- 12Scala.js vs Mitosis
- 13Scala.js vs Fable
- 14Scala.js vs ReScript
- 15Scala.js vs Haxelib
- 16Scala.js vs PureScript Registry
- 17Scala.js vs J2ObjC
- 18Scala.js vs Brython
- 19Scala.js vs Kalai
- 20Scala.js vs SourceMeld
- 21Scala.js vs CodeTransEngine
Scala.js alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | ClojureScript | 7.3 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 2 | Google Web Toolkit | 7.3 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 3 | Kotlin/JS | 7.3 | Free plan | Free | Linux, Mac, Web, Windows |
| 4 | Cython | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 6 | SWC | 7.2 | Free plan | Free | Android, API, Linux, Mac, Web, Windows |
| 7 | Transcrypt | 7.2 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 8 | Babel | 7.1 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 9 | Vala | 6.9 | Free plan | Free | Linux, Mac, Windows |
| 10 | CoffeeScript | 6.6 | No | — | API, Linux, Mac, Web, Windows |
| 11 | Dart pub | 6.5 | No | — | Linux, Mac, Windows |
| 12 | Mitosis | 6.5 | No | — | API, Web |
| 13 | Fable | 6.2 | No | — | Web |
| 14 | ReScript | 6.2 | No | — | Web |
| 15 | Haxelib | 6.1 | No | — | Linux, Mac, Windows |
| 16 | PureScript Registry | 6.1 | No | — | API, Web |
| 17 | J2ObjC | 6.0 | No | — | Mac, Linux |
| 18 | Brython | 5.8 | No | — | Web |
| 19 | Kalai | 5.8 | No | — | — |
| 20 | SourceMeld | 5.8 | No | — | — |
| 21 | CodeTransEngine | 5.7 | No | — | — |
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Questions about Scala.js alternatives
What is the best alternative to Scala.js?
ClojureScript, number 1 in code transpilers with a score of 7.3 out of 10. The others here: Google Web Toolkit, Kotlin/JS, Cython and 16 more.
What is the best free alternative to Scala.js?
ClojureScript is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.