Life & fun · alternatives · 2026

A web-based CoffeeScript REPL that allows users to write and execute CoffeeScript code directly in a browser. It compiles CoffeeScript to JavaScript in real-time, making it useful for learning the language, testing… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Web-based CoffeeScript REPL/console launched in 2012; newer entries below may have overtaken it.

1. 1
   Decaffeinate converts CoffeeScript projects to modern JS▲361

   Goodbye CoffeeScript, hello JavaScript! Contribute to decaffeinate/decaffeinate development by creating an account on GitHub.

   2017 · github.com · its alternatives →

2. 2
   Repl.it▲399

   Code and deploy apps in any language right from your browser

   2018 · replit.com · its alternatives →

3. 3
   Bun▲303

   A fast JS runtime Node.js replacement with built‑in tools

   Dec 2025 · bun.com · its alternatives →

4. 4
   Fast.js – faster reimplementations of native JavaScript functions▲323

   Faster user-land reimplementations for several common builtin native JavaScript functions. - codemix/fast.js

   2014 · github.com · its alternatives →

5. 5
   Caffeine – Minimum viable back end for prototyping▲206

   A basic REST service for JSON data - enough for prototyping and MVPs! - rehacktive/caffeine

   2021 · github.com · its alternatives →

6. 6
   CodeCafé – A real-time collaborative code editor in the browser▲81

   Hey guys! I’ve been working on a web app called CodeCafé—a collaborative, browser-based code editor inspired by VS Code and Replit, but with no downloads, no sign-up, and zero setup. You just open the link and start coding—together. The frontend is built with React and TypeScript, and the backend runs on Java with Spring Boot, which handles real-time editing via WebSockets. For syncing changes, I’m using Redis along with a custom Operational Transformation system (no third-party libraries!!!). The idea came after I found out a local summer school was teaching coding using Google Docs (yes,…

   2025 · github.com · its alternatives →

7. 7RC
   Replify – Create a REPL for any command▲112

   GitHub Gist: instantly share code, notes, and snippets.

   2016 · gist.github.com · its alternatives →

8. 8RJ
   ReplPad – Javascript Repl/Scratchpad▲54

   2021 · replpad.com · its alternatives →

9. 9PR
   Please review my new Server-Side JavaScript/CoffeeScript servers▲23

   2011 · cure.willsave.me · its alternatives →

10. 10
    repl.it▲109

    Online code repl for pretty much any language.

    2015 · replit.com · its alternatives →

11. 11
    Cupertino.js – A JavaScript to Cocoa compiler and runtime▲77

    2014 · github.com · its alternatives →

12. 12
    Weekend project - VS2010 CoffeeScript syntax highlighting▲39

    CoffeeScript syntax highlighting for Visual Studio 2010 - chrisdunelm/CoffeeLite

    2011 · github.com · its alternatives →

13. 13MT
    My Turbo Pascal compiler in JavaScript▲101

    2013 · teamten.com · its alternatives →

14. 14
    Turn your fzf into a live REPL▲190

    Turn Your fzf Into a Live REPL

    2019 · paweldu.dev · its alternatives →

15. 15JC
    JavaScript/CoffeeScript Project Euler Command Line Tool▲19

    2014 · npmjs.org · its alternatives →

16. 16
    REPL-Driven Development for JavaScript▲20

    Lisp-inspired interactive REPL editor tools for Javascript

    2022 · github.com · its alternatives →

17. 17
    Shelgon: A Framework for Building Interactive REPL Shells in Rust▲130

    I've been working on Shelgon, a framework that lets you build your own custom REPL shells and interactive CLI applications in Rust. You can use Shelgon to: - Create a custom shell with only a few lines of code - Build interactive debugging tools with persistent state between commands - Develop domain-specific language interpreters with shell-like interfaces - Add REPL capabilities to existing applications Getting started is straightforward - implement a single trait that handles your command execution logic, and Shelgon takes care of the terminal UI, input handling, and async runtime…

    2025 · github.com · its alternatives →

18. 18
    REPL JS▲8

    An online JavaScript editor for tinkering and testing

    2018 · repljs.com · its alternatives →

19. 19
    Coffee2D – A simple HTML5 game engine▲14

    A HTML5 2D game engine written in CoffeeScript. Contribute to LanJian/coffee2d development by creating an account on GitHub.

    2015 · github.com · its alternatives →

20. 20
    Faster.js – a micro-optimizing JavaScript compiler▲89

    faster.js is a Babel plugin that compiles idiomatic Javascript to faster, micro-optimized Javascript. - vzhou842/faster.js

    2018 · github.com · its alternatives →

21. 21
    JSFiddle▲107

    Test and share JavaScript, CSS, HTML or CoffeeScript online.

    2014 · jsfiddle.net · its alternatives →

22. 22
    Gridland: make terminal apps that also run in the browser▲111

    Hi everyone, Gridland is a runtime + ShadCN UI registry that makes it possible to build terminal apps that run in the browser as well as the native terminal. This is useful for demoing TUIs so that users know what they're getting before they are invested enough to install them. And, tbh, it's also just super fun! Gridland is the successor to Ink Web (ink-web.dev) which is the same concept, but using Ink + xterm.js. After building Ink Web, we continued experimenting and found that using OpenTUI and a canvas renderer performed better with less flickering and nearly instant load times. We're…

    Mar 2026 · gridland.io · its alternatives →

23. 23
    Online Haskell REPL▲82

    We heard your requests for Haskell and today we're excited to finally announce Haskell as yet another language we support. We've decided to put our focus...

    2017 · repl.it · its alternatives →

24. 24
    A Repo of JavaScript Coding Challenges▲127

    Some basic javascript coding challenges and interview questions - kolodny/exercises

    2015 · github.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 →