JSweet is for Java developers building web or mobile HTML5 applications that use JavaScript libraries and frameworks.
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Best Code Transpilers 2026
Facts read 29 Sep 2026 – 15 Oct 2026
JSweet leads this list of 28 (record score 5.8, free plan). SWC is next (record score 5.3, free plan), and ClojureScript is the next highest-placed with a free plan (record score 5.0).
Code transpilers convert code between languages or syntax versions, so it helps to start with the source and destination you need. Compared on source languages, target languages and syntax-version conversion, the entries also vary in conversion mode and intermediate output. API and CLI access can help you assess how a tool fits your workflow, while free-plan availability and paid-from pricing provide cost context. SWC, Transcrypt and Babel are among the named options. Compare the listed language support and conversion details with your development needs, then consider which access method and output characteristics are relevant to how you work.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 JSweet | JSweet is for Java developers building web or mobile HTML5 applications that use JavaScript libraries and frameworks. | 5.8 | Free plan | Free plan | Android, iPhone & iPad, Web, Windows | 15 Oct 2026 |
| 02 SWC | SWC suits developers and build-tool authors who need JavaScript or TypeScript compilation, transforms, or integrations. | 5.3 | Free plan | Free plan | Android, Web, Windows, Mac | 30 Sep 2026 |
| 03 ClojureScript | ClojureScript suits developers who want to use Clojure for JavaScript-based client or embedded applications. | 5.0 | Free plan | Free plan | Web, Windows, Mac, Linux | 3 Oct 2026 |
| 04 Transcrypt | It suits developers who want to write browser applications in Python and use JavaScript libraries. | 5.0 | Free plan | Free plan | Web, Windows, Mac, Linux | 3 Oct 2026 |
| 05 Google Web Toolkit | GWT suits developers building AJAX applications in Java for browser deployment. | 4.9 | Free plan | Free plan | Web, Windows, Mac, Linux | 30 Sep 2026 |
| 06 Opal | 4.9 | Free plan | Free plan | Web, Windows, Mac, Linux | 7 Oct 2026 | |
| 07 Babel | Babel suits JavaScript developers who need to transform modern syntax for older environments, use JSX, or build custom plugin pipelines. | 4.8 | Free plan | Free plan | Web, Windows, Mac, Linux | 29 Sep 2026 |
| 08 Haxelib | Haxelib suits Haxe developers who need dependency management, library discovery, version selection, or private and local repositories across desktop platforms. | 4.8 | Free plan | Free plan | Windows, Mac, Linux, API | 8 Oct 2026 |
| 09 Kotlin/JS | Kotlin/JS suits developers building web frontends in Kotlin or sharing business logic with JavaScript or TypeScript codebases. | 4.8 | Free plan | Free plan | Web, Windows, Mac, Linux | 29 Sep 2026 |
| 10 Brython | It suits developers who want to use Python to build interactive browser applications. | 4.7 | Free plan | Free plan | Android, iPhone & iPad, Web, Self-hosted | 8 Oct 2026 |
02
SWC
SWC suits developers and build-tool authors who need JavaScript or TypeScript compilation, transforms, or integrations.
AndroidWebWindows+3 Record5.3 Visit
03
ClojureScript
ClojureScript suits developers who want to use Clojure for JavaScript-based client or embedded applications.
WebWindowsMac+2 Record5.0 Visit
04
Transcrypt
It suits developers who want to write browser applications in Python and use JavaScript libraries.
WebWindowsMac+2 Record5.0 Visit
05
Google Web Toolkit
GWT suits developers building AJAX applications in Java for browser deployment.
WebWindowsMac+2 Record4.9 Visit
7
Babel
WebWindowsMac+2 Free plan Record4.8 Visit Babel suits JavaScript developers who need to transform modern syntax for older environments, use JSX, or build custom plugin pipelines.
8
Haxelib
WindowsMacLinux+1 Free plan Record4.8 Visit Haxelib suits Haxe developers who need dependency management, library discovery, version selection, or private and local repositories across desktop platforms.
9
Kotlin/JS
WebWindowsMac+1 Free plan Record4.8 Visit Kotlin/JS suits developers building web frontends in Kotlin or sharing business logic with JavaScript or TypeScript codebases.
10
Brython
AndroidiPhone & iPadWeb+1 Free plan Record4.7 Visit It suits developers who want to use Python to build interactive browser applications.
12
Scala.js
WebWindowsMac+2 Free plan Record4.7 Visit It suits Scala developers building browser, Node.js, serverless, or WebAssembly applications who need JavaScript interoperability.
14
J2ObjC
iPhone & iPadMacLinux Free plan Record4.6 Visit J2ObjC suits developers who want to reuse Java application logic or data models in iOS projects and have the required Mac, Xcode, and JDK setup.
15
js_of_ocaml
WebLinuxAPI Free plan Record4.6 Visit It suits OCaml developers who want to run existing bytecode programs in browsers or Node.js and connect them to JavaScript or browser APIs.
17
Cython
WindowsMacLinux Free plan Record4.5 Visit It suits Python developers who need C extensions, connections to C or C++ libraries, or compiled modules for performance-focused work.
18
TypeScript Playground
Web Free plan Record4.5 Visit It suits learners and developers who want to try or share TypeScript and JavaScript code without setting up a project.
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