Best Opal Alternatives in 2026
Updated
20 tools from code transpilers ranked against Opal on the same published basis.
- 1Opal vs SWC
- 2Opal vs Google Web Toolkit
- 3Opal vs Transcrypt
- 4Opal vs ClojureScript
- 5Opal vs Kotlin/JS
- 6Opal vs Babel
- 7Opal vs Scala.js
- 8Opal vs Cython
- 9Opal vs CoffeeScript
- 10Opal vs Vala
- 11Opal vs Dart pub
- 12Opal vs Mitosis
- 13Opal vs Fable
- 14Opal vs ReScript
- 15Opal vs Haxelib
- 16Opal vs PureScript Registry
- 17Opal vs J2ObjC
- 18Opal vs Brython
- 19Opal vs SourceMeld
- 20Opal vs js_of_ocaml
Opal alternatives compared
| # | Tool | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | SWC | 7.6 | Free plan | Free | Android, API, Linux, Mac, Web, Windows |
| 2 | Google Web Toolkit | 7.5 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 3 | Transcrypt | 7.5 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 4 | ClojureScript | 7.4 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 5 | Kotlin/JS | 7.4 | Free plan | Free | Linux, Mac, Web, Windows |
| 6 | Babel | 7.3 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 7 | Scala.js | 7.3 | Free plan | Free | API, Linux, Mac, Web, Windows |
| 8 | Cython | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 9 | CoffeeScript | 7.1 | No | — | API, Linux, Mac, Web, Windows |
| 10 | Vala | 7.0 | Free plan | Free | Linux, Mac, Windows |
| 11 | Dart pub | 6.8 | No | — | Linux, Mac, Windows |
| 12 | Mitosis | 6.6 | No | — | API, Web |
| 13 | Fable | 6.4 | No | — | Web |
| 14 | ReScript | 6.4 | No | — | Web |
| 15 | Haxelib | 6.3 | No | — | Linux, Mac, Windows |
| 16 | PureScript Registry | 6.2 | No | — | API, Web |
| 17 | J2ObjC | 6.1 | No | — | Mac, Linux |
| 18 | Brython | 5.8 | No | — | Web |
| 19 | SourceMeld | 5.8 | No | — | — |
| 20 | js_of_ocaml | 5.7 | No | — | Web |
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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 7.6 out of 10. The others here: Google Web Toolkit, Transcrypt, ClojureScript and 16 more.
What is the best free alternative to Opal?
SWC 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, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.