Best Opal Alternatives in 2026
Updated
20 apps from code transpilers ranked against Opal on the same published basis.
- 1Opal vs SWC
- 2Opal vs Transcrypt
- 3Opal vs Babel
- 4Opal vs ClojureScript
- 5Opal vs Google Web Toolkit
- 6Opal vs Kotlin/JS
- 7Opal vs Cython
- 8Opal vs Vala
- 9Opal vs CoffeeScript
- 10Opal vs Dart pub
- 11Opal vs Fable
- 12Opal vs Haxelib
- 13Opal vs Mitosis
- 14Opal vs J2ObjC
- 15Opal vs Brython
- 16Opal vs js_of_ocaml
- 17Opal vs JSweet
- 19Opal vs Skulpt
- 20Opal vs SourceMeld
- 21Opal vs CodeTransEngine
Opal alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | SWC | 6.7 | Free plan | Free | Android, API, Linux, Mac, Web, Windows |
| 2 | Transcrypt | 6.7 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 3 | Babel | 6.6 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 4 | ClojureScript | 6.6 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 5 | Google Web Toolkit | 6.6 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 6 | Kotlin/JS | 6.6 | Free plan | Free | Linux, Mac, Web, Windows |
| 7 | Cython | 6.5 | Free plan | Free | Linux, Mac, Windows |
| 8 | Vala | 6.5 | Free plan | Free | Linux, Mac, Windows |
| 9 | CoffeeScript | 5.7 | No | — | API, Linux, Mac, Web, Windows |
| 10 | Dart pub | 5.6 | No | — | Linux, Mac, Windows |
| 11 | Fable | 5.4 | No | — | Web |
| 12 | Haxelib | 5.4 | No | — | Linux, Mac, Windows |
| 13 | Mitosis | 5.4 | No | — | API, Web |
| 14 | J2ObjC | 5.3 | No | — | Mac, Linux |
| 15 | Brython | 5.2 | No | — | Web |
| 16 | js_of_ocaml | 5.2 | No | — | Web |
| 17 | JSweet | 5.2 | No | — | Web |
| 19 | Skulpt | 5.2 | No | — | Web |
| 20 | SourceMeld | 5.2 | No | — | — |
| 21 | CodeTransEngine | 5.1 | No | — | — |
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Questions about Opal alternatives
What is the best alternative to Opal?
SWC, number 1 in code transpilers with a score of 6.7 out of 10. The others here: Transcrypt, Babel, ClojureScript and 16 more.
What is the best free alternative to Opal?
SWC 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 free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.