The Best Code Transpilers in 2026
This category was researched from official websites, including pricing pages, plan tables and product documentation, then ranked on the core job of converting code, value for money and verified features. Use it to compare tools for language, syntax-version and compatible intermediate-form conversion in Code Transpilers.
Our top picks
-
Top ranked
Babel#1 of 289.3/10Flexible ECMAScript transforms with CLI, Node.js APIs, and browser compilation.
Free plan
-
Runner-up
SWC#2 of 289.2/10An open-source compiler with minification and bundling for JavaScript and TypeScript workflows.
Free plan
-
Top-ranked free plan
Kotlin/JS#3 of 288.8/10A free Kotlin-to-JavaScript toolchain for browser and Node.js projects.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 28 tools, best first
-
Best forJavaScript projects needing flexible transforms
Flexible ECMAScript transforms with CLI, Node.js APIs, and browser compilation.
- Syntax-version conversion
- Intermediate output
- API access
9.3/10★★★★★Visit Babel -
Best forFast JavaScript and TypeScript build pipelines
An open-source compiler with minification and bundling for JavaScript and TypeScript workflows.
9.2/10★★★★★Visit SWC -
Best forKotlin teams targeting browsers or Node.js
A free Kotlin-to-JavaScript toolchain for browser and Node.js projects.
- Syntax-version conversion
- Intermediate output
- CLI access
8.8/10★★★★☆Visit Kotlin/JS -
Best forPython projects needing C or C++ extensions
An open-source compiler for Python projects that need native C or C++ extensions.
- API access
- CLI access
8.7/10★★★★☆Visit Cython -
Best forJava teams targeting JavaScript or WebAssembly
A free, open-source compiler for Java teams building browser applications or native targets.
- API access
- CLI access
8.6/10★★★★☆Visit TeaVM -
Best forJava teams building browser applications
A Java-based route to browser applications, with compilation, widgets and testing tools.
- API access
- CLI access
8.5/10★★★★☆Visit GWT -
Best forClojure teams targeting browser and Node.js
An open-source Clojure-to-JavaScript compiler with browser and Node.js targets.
- API access
- CLI access
8.4/10★★★★☆Visit ClojureScript -
Best forScala teams building JavaScript applications
An open-source Scala-to-JavaScript toolchain with incremental builds and JavaScript interoperability.
- Intermediate output
- API access
- CLI access
8.3/10★★★★☆Visit Scala.js -
Best forTyped JavaScript teams wanting ReScript
ReScript adds static typing to JavaScript projects and compiles to readable JavaScript.
- CLI access
8.2/10★★★★☆Visit ReScript -
Best forF# teams targeting several languages
A self-hosted F# compiler with seven listed output targets and CLI workflows.
- CLI access
8.1/10★★★★☆Visit Fable -
Best forSmall teams removing types and JSX from JavaScript
A free, focused transpiler for TypeScript, JSX and Flow in development workflows.
8.0/10★★★★☆Visit Sucrase -
Best forJava teams targeting TypeScript and JavaScript
An open-source Java-to-web transpiler for teams that want to keep Java syntax and tooling.
- Syntax-version conversion
- Intermediate output
- CLI access
7.9/10★★★★☆Visit JSweet -
Best forPython developers targeting browsers or Node.js
A free, open-source Python-to-JavaScript compiler with CLI builds and debugging support.
- CLI access
7.8/10★★★★☆Visit Transcrypt -
Best forCoffeeScript users needing JavaScript output
A concise alternative syntax for producing modern JavaScript, with CLI, REPL, and API access.
- Syntax-version conversion
- Intermediate output
- API access
7.7/10★★★★☆Visit CoffeeScript -
Best forRuby developers bringing code to JavaScript
A free, open-source compiler for bringing Ruby code into JavaScript projects.
- API access
- CLI access
7.6/10★★★★☆Visit Opal -
Best forTeams generating components for multiple frameworks
An open-source JSX component compiler for generating code across frameworks.
- Intermediate output
- CLI access
7.5/10★★★★☆Visit Mitosis -
Best forPython developers running code in the browser
A browser-based Python 3 option for developers building client-side web applications.
- Intermediate output
- API access
- CLI access
7.4/10★★★★☆Visit Brython -
Best forBrowser-based Python demos and learning tools
A focused way to embed Python execution in browser-based learning tools and demos.
- API access
- CLI access
7.3/10★★★★☆Explore Skulpt -
Best forOCaml developers targeting browsers or Node.js
A focused OCaml-to-JavaScript compiler with browser bindings and Dune support.
- CLI access
7.2/10★★★★☆Visit js_of_ocaml -
Best forJava teams integrating non-UI code into iOS apps
A focused Java-to-Objective-C tool for sharing non-UI code with iOS apps.
- CLI access
7.1/10★★★★☆Visit J2ObjC -
Best forVala developers building native GTK applications
An open-source Vala-to-C compiler for native apps, especially in the GObject and GTK ecosystem.
- Intermediate output
- API access
- CLI access
7.0/10★★★★☆Visit Vala -
Best forTeams evaluating automated cross-language migration
A self-hosted translation backend with multiple algorithms and test-based verification.
- API access
- CLI access
6.9/10★★★☆☆Try CodeTransEngine -
Best forTeams migrating code across repositories
A self-hosted tool for teams mapping repositories and migrating code across languages.
- API access
6.8/10★★★☆☆Visit SourceMeld -
Best forClojure developers targeting Rust, Java, or C++
A focused CLI transpiler for Clojure projects targeting Rust, Java, or C++.
- CLI access
6.6/10★★★☆☆Visit Kalai -
Best forDevelopers inspecting or sharing TypeScript output
A free browser playground for inspecting TypeScript output and sharing reproducible examples.
6.5/10★★★☆☆Open Playground -
Best forPureScript teams publishing ecosystem packages
A PureScript package registry, not a code transpiler.
6.4/10★★★☆☆Visit PureScript -
Best forHaxe developers managing Haxelib dependencies
A focused Haxe dependency manager, not a code transpiler.
6.2/10★★★☆☆Visit Haxelib -
Best forDart and Flutter teams managing dependencies
A dependency manager for Dart and Flutter—not a code transpiler.
6.1/10★★★☆☆Visit Dart pub
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Intermediate output | API access | Score |
|---|---|---|---|---|---|---|
| 1 | Babel | Yes | Free | Yes | Yes | 9.3 |
| 2 | SWC | Yes | Free | 9.2 | ||
| 3 | Kotlin/JS | Yes | Free | Yes | 8.8 | |
| 4 | Cython | Yes | Free | No | Yes | 8.7 |
| 5 | TeaVM | Yes | Free | Yes | 8.6 | |
| 6 | Google Web Toolkit | Yes | Free | Yes | 8.5 | |
| 7 | ClojureScript | Free | Yes | 8.4 | ||
| 8 | Scala.js | Free | Yes | Yes | 8.3 | |
| 9 | ReScript | Free | 8.2 | |||
| 10 | Fable | Free | 8.1 | |||
| 11 | Sucrase | Yes | Free | 8.0 | ||
| 12 | JSweet | Free | Yes | 7.9 | ||
| 13 | Transcrypt | Yes | Free | No | 7.8 | |
| 14 | CoffeeScript | Free | Yes | Yes | 7.7 | |
| 15 | Opal | Yes | Free | Yes | 7.6 | |
| 16 | Mitosis | Yes | Free | Yes | 7.5 | |
| 17 | Brython | Free | Yes | Yes | 7.4 | |
| 18 | Skulpt | Yes | Free | Yes | 7.3 | |
| 19 | js_of_ocaml | Free | No | No | 7.2 | |
| 20 | J2ObjC | Yes | Free | No | 7.1 | |
| 21 | Vala | Free | Yes | Yes | 7.0 | |
| 22 | CodeTransEngine | Free | No | Yes | 6.9 | |
| 23 | SourceMeld | Yes | No | Yes | 6.8 | |
| 24 | Kalai | Free | No | No | 6.6 | |
| 25 | TypeScript Playground | Yes | Free | 6.5 | ||
| 26 | PureScript Registry | Free | 6.4 | |||
| 27 | Haxelib | Yes | Free | 6.2 | ||
| 28 | Dart pub | Yes | Free | 6.1 |
Head-to-head All 28 comparisons →
- Babel vs SWC
- Babel vs Kotlin/JS
- Babel vs Cython
- Babel vs TeaVM
- Babel vs Google Web Toolkit
- Babel vs ClojureScript
- Babel vs Scala.js
- SWC vs Kotlin/JS
- SWC vs Cython
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How we rank code transpilers
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update