Best Kalai Alternatives in 2026
Updated
20 platforms from code transpilers ranked against Kalai on the same published basis.
- 1Kalai vs Babel
- 2Kalai vs SWC
- 3Kalai vs Scala.js
- 4Kalai vs CoffeeScript
- 5Kalai vs Mitosis
- 6Kalai vs PureScript Registry
- 7Kalai vs Transcrypt
- 8Kalai vs ClojureScript
- 9Kalai vs Cython
- 10Kalai vs Google Web Toolkit
- 11Kalai vs Kotlin/JS
- 12Kalai vs Vala
- 13Kalai vs Dart pub
- 14Kalai vs Fable
- 15Kalai vs ReScript
- 16Kalai vs Haxelib
- 17Kalai vs J2ObjC
- 18Kalai vs SourceMeld
- 19Kalai vs Brython
- 20Kalai vs CodeTransEngine
Kalai alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Babel | 7.3 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 2 | SWC | 7.3 | Free plan | Free | Android, API, Linux, Mac, Web, Windows |
| 3 | Scala.js | 7.2 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 4 | CoffeeScript | 7.0 | No | — | API, Linux, Mac, Web, Windows |
| 5 | Mitosis | 7.0 | No | — | API, Web |
| 6 | PureScript Registry | 6.7 | No | — | API, Web |
| 7 | Transcrypt | 6.0 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 8 | ClojureScript | 5.9 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 9 | Cython | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 10 | Google Web Toolkit | 5.9 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 11 | Kotlin/JS | 5.9 | Free plan | Free | Linux, Mac, Web, Windows |
| 12 | Vala | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 13 | Dart pub | 5.5 | No | — | Linux, Mac, Windows |
| 14 | Fable | 5.4 | No | — | Web |
| 15 | ReScript | 5.4 | No | — | Web |
| 16 | Haxelib | 5.2 | No | — | Linux, Mac, Windows |
| 17 | J2ObjC | 5.2 | No | — | Mac, Linux |
| 18 | SourceMeld | 5.2 | No | — | — |
| 19 | Brython | 5.1 | No | — | Web |
| 20 | CodeTransEngine | 5.1 | No | — | — |
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Questions about Kalai alternatives
What is the best alternative to Kalai?
Babel, number 1 in code transpilers with a score of 7.3 out of 10. The others here: SWC, Scala.js, CoffeeScript and 16 more.
What is the best free alternative to Kalai?
Babel is the best-ranked alternative with a free plan. 9 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.