Life & fun · alternatives · 2026

24 alternatives to DuoCode

C#-to-JavaScript compiler

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. DuoCode launched in 2015; newer entries below may have overtaken it.

1. 1D1
   DuoCode 1.0 bridges the gap between C# and TypeScript▲7

   2015 · blog.duoco.de · its alternatives →

2. 2CT
   C#-to-JavaScript compiler powered by Microsoft Roslyn▲155

   2015 · duoco.de · its alternatives →

3. 3
   deco.cx 2.0▲1,078

   Build web apps 10x faster with Deno, JSX, TS & Tailwind

   2024 · decocms.com · its alternatives →

4. 4
   DuoCoder▲11

   Duolingo but for coders

   2017 · jasonpark.me · its alternatives →

5. 5IW
   I wrote a .NET to JS compiler. Here's an XNA demo compiled to JS.▲103

   2011 · hildr.luminance.org · its alternatives →

6. 6
   CodeShare.io▲94

   Realtime code sharing for developers

   2014 · codeshare.io · its alternatives →

7. 7
   Remarkable▲82

   a JavaScript Markdown and Commonmark parser

   2014 · github.com · its alternatives →

8. 8
   How to write a tiny compiler▲224

   Write your own compiler: introduction. Code genetation. AST. Abstract syntax tree. lisp. javascript.

   2017 · blog.klipse.tech · its alternatives →

9. 9
   CoderPad▲77

   In-browser REPL and compiler for programmer interviews.

   2014 · coderpad.io · its alternatives →

10. 10JP
    JavaScript Program Synthesis▲139

    2021 · grgv.xyz · its alternatives →

11. 11
    CodeCombat▲143

    Learn to Code JavaScript by Playing a Game

    2014 · codecombat.com · its alternatives →

12. 12
    Codecrap▲93

    Where developers go to laugh and cry

    2014 · codecrap.com · its alternatives →

13. 13
    NotebookJS▲109

    Scientific computation for JavaScript

    2016 · datazar.com · its alternatives →

14. 14
    Code editor by Flawwwless▲89

    An online Javascript code editor 🤖

    2019 · its alternatives →

15. 15
    Komando▲67

    IRC for people who write code

    2014 · github.com · its alternatives →

16. 16
    WebAssembly▲86

    New binary format for compiling applications for the web

    2015 · github.com · its alternatives →

17. 17
    Code Climate▲63

    Quality & security analysis for RoR and JS.

    2014 · codeclimate.com · its alternatives →

18. 18
    Modular JavaScript▲67

    Let's write robust, well-tested, modular JavaScript code.

    2016 · rajabandotind.com · its alternatives →

19. 19
    A self-hosted js compiler in 1k loc▲47

    Minimal self-hosted JavaScript compiler in 1k lines of code - maierfelix/mini-js

    2017 · github.com · its alternatives →

20. 20JJ
    j2c — JavaScript object to CSS compiler▲5

    2015 · j2c.py.gy · its alternatives →

21. 21
    An experimental Python to C#/Go/Ruby/JS transpiler▲14

    a restricted python to javascript / c# / go / ruby compiler - pseudo-lang/pseudo-python

    2016 · github.com · its alternatives →

22. 22
    Eloquent Javascript▲20

    A modern introduction to Javascript

    2014 · eloquentjavascript.net · its alternatives →

23. 23
    Coderviews▲7

    A real-time, collaborative compiler.

    2017 · its alternatives →

24. 24
    Stencil▲9

    A Compiler for Web Components

    2017 · stenciljs.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →