Online REPL for 15+ languages.
CoffeeScript CSS HTML JavaScript Python
Latest commit 0ccdd77 Apr 11, 2016 @amasad amasad clarify copyrights

Deprecation notice: This project is no longer actively maintained because we're moving language sandboxes to the server for a faster, complete, and up-to-date implementations. You can use our API.

An online environment for interactively exploring programming languages, based on jsREPL.

Current Languages

  • JavaScript Variants

    • JavaScript
    • CoffeeScript
    • Kaffeine
    • Move
  • Esoteric

    • Bloop
    • Brainfuck
    • Unlambda
    • Emoticon
  • Classic

    • Quick Basic
    • Forth
  • Serious

    • Scheme
    • Lua
    • Python
    • Ruby (beta)

Getting the Code

git clone git://
git submodule update --init --recursive




curl | sh


Using npm:

npm install coffee-script
npm install -g coffee-script


Using easy_install:

easy_install Pygments

Using pip:

pip install Pygments

Running comes bundled with a static node HTTP file server and a CoffeeScript file watcher & (re)-compiler:

./server.js 8888 can then be opened at http://localhost:8888/index.html.

License source code is available under the MIT license. However, the logos and assets represent only and should not be used to represent your products. External libraries used in may use other licenses. Please check each library for its specific license.