Best Code Transpilers in 2026
Updated
In short: ClojureScript is ranked #1 of 28 as of 3 October 2026, ahead of Google Web Toolkit and Kotlin/JS. The best-ranked option with a free plan is Google Web Toolkit.
When code needs to move between languages or syntax versions, a transpiler can convert source into a target form. Compared on source languages, target languages, and syntax-version conversion, the entries also differ in conversion mode and intermediate output. Check API and CLI access to see how a tool may fit into your workflow, and consider free-plan availability alongside paid-from pricing. SWC, Kotlin/JS, and Babel lead the ranking, followed by Cython and Google Web Toolkit. Start with the languages and conversion tasks you need to handle, then compare the listed access methods and outputs to identify relevant options.
28 code transpilers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 ClojureScript Top pick · 7.3 Free plan · Free
#2 Google Web Toolkit Runner-up · 7.3 Free plan · Free
#3 Kotlin/JS Also great · 7.3 Free plan · Free
- Free plan LinuxmacOSself-hostedWebWindowsRecognisedDocumentedFree planFree trialPlatforms
- Free plan extensionLinuxmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Free plan LinuxmacOSWebWindows
- Free plan
- Yes
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Free plan LinuxmacOSWindows
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - Free plan AndroidapiLinuxmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatformsFree About SWCVisit site - Free plan LinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - Free plan apiLinuxmacOSWebWindows
- Free plan
- Yes
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Free plan LinuxmacOSWindows
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatformsFree About ValaVisit site - apiLinuxmacOSWebWindows
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms - LinuxmacOSWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - LinuxmacOSWindows
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - macOSLinux
- Free plan
- Yes
- Source languages
- 1 languages
- Target languages
- 1 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - Web
- Syntax-version conversion
- No
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms -
- Target languages
- 3 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - apiWeb
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms -
- Free plan
- Yes
- Source languages
- 8 languages
- Target languages
- 8 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms -
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - Web
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedFree planFree trialPlatforms - Web
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms -
- Source languages
- 1 languages
- Target languages
- 7 languages
RecognisedDocumentedFree planFree trialPlatforms -
- Intermediate output
- Yes
RecognisedDocumentedFree planFree trialPlatforms -
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms - Web
- Free plan
- Yes
RecognisedDocumentedFree planFree trialPlatforms
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which code transpiler is ranked first on The Geeks Club?
ClojureScript is ranked #1 of 28 with a score of 7.3. Google Web Toolkit is second and Kotlin/JS third.
How many of these have a free plan?
8 of the 25 on this page publish a free plan on their own pricing pages.
How is this list ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.