Best Code Transpilers in 2026
Updated
In short: SWC is ranked #1 of 28 as of 3 October 2026, ahead of Google Web Toolkit and Transcrypt. The best-ranked option with a free plan is Google Web Toolkit.
When code needs to move between languages or syntax versions, the transpiler's inputs, outputs, and way of running it all matter. Compared on source languages, target languages, and syntax-version conversion, these entries also differ in conversion mode and intermediate output. Check API and CLI access, free-plan availability, and paid-from pricing for further distinctions. SWC and Babel head the ranking, followed by Kotlin/JS and Google Web Toolkit; Cython is also among the first options. Compare the listed capabilities with the languages you need to convert and the access method that suits your development workflow.
28 code transpilers ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 SWC Top pick · 7.6 Free plan · Free
#2 Google Web Toolkit Runner-up · 7.5 Free plan · Free
#3 Transcrypt Also great · 7.5 Free plan · Free- Free plan AndroidapiLinuxmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trialFree About SWCVisit site - Free plan extensionLinuxmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan LinuxmacOSself-hostedWebWindows
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Free plan LinuxmacOSself-hostedWebWindowsRecognisedDocumentedPlatformsFree planFree trial
- Free plan LinuxmacOSWebWindows
- Free plan
- Yes
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan apiLinuxmacOSWebWindows
- Free plan
- Yes
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan LinuxmacOSWindows
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - apiLinuxmacOSWebWindows
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan LinuxmacOSWindows
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trialFree About ValaVisit site - LinuxmacOSWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - LinuxmacOSWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - macOSLinux
- Free plan
- Yes
- Source languages
- 1 languages
- Target languages
- 1 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Web
- Syntax-version conversion
- No
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial - apiWeb
- Free plan
- Yes
- Syntax-version conversion
- No
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial -
- Free plan
- Yes
- Source languages
- 8 languages
- Target languages
- 8 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Web
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Web
- Syntax-version conversion
- Yes
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial -
- Target languages
- 3 languages
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial -
- Syntax-version conversion
- No
- Intermediate output
- No
RecognisedDocumentedPlatformsFree planFree trial - Web
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial -
- Source languages
- 1 languages
- Target languages
- 7 languages
RecognisedDocumentedPlatformsFree planFree trial -
- Intermediate output
- Yes
RecognisedDocumentedPlatformsFree planFree trial -
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial
Is your tool 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 Specifiction?
SWC is ranked #1 of 28 with a score of 7.6. Google Web Toolkit is second and Transcrypt 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 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. Paid placements never change a rank.