Skip to content
Functional Reactive Programming domain-specific language embedded in Haskell, for programming efficient hybrid (mixed discrete-time and continuous-time) systems.
Branch: develop
Clone or download


Build Status Version on Hackage Flattr this

Domain-specific language embedded in Haskell for programming hybrid (mixed discrete-time and continuous-time) systems. Yampa is based on the concepts of Functional Reactive Programming (FRP) and is structured using arrow combinators.


Yampa is available on hackage:

$ cabal sandbox init         # Optional, but recommended
$ cabal update
$ cabal install Yampa


There is a directory with examples, which includes two basic SDL examples and one with using a Nintendo Wii Remote. You can install them with:

$ cabal sandbox init         # Optional, but recommended
$ cabal update
$ cabal install Yampa -fexamples

Other examples

There are many programs written in Yampa. See the following examples:

  • Haskanoid: a game that uses SDL multimedia, wiimote and kinect. It's cross platform and works in desktop, mobile, and web (compiled with GHCJS).
  • Space invaders.
  • Frag: a 3D first person shooting game.
  • Yampa-2048: an implementation of the game 2048 using Yampa and Gloss.
  • MandelbrotYampa: a "hello world" using SDL2, Yampa and OpenGL.
  • Haskelloids: a reproduction of the Atari 1979 classic "Asteroids"

A more comprehensive list can be obtained using the reverse dependency finder (, but only programs uploaded to hackage are listed.

Haskanoid Video Space Invaders Space Invaders
Haskanoid, SDL cross-platform arkanoid. SpaceInvaders, GLUT arcade game Yampa2048, a gloss board game

Use in production


Yampa is backend agnostic, you can ultimately connect it to any backend you want. Existing backends include:


Yampa comes with a sophisticated testing library that allows you to use QuickCheck to test your games, and use a time-travel debugger. These features are described in the paper Testing and Debugging Functional Reactive Programming.

You can find the additional projects at:

Documentation and tutorials

The distribution of Yampa comes with substantial haddock documentation, which you can build using haddock or just read online. To build a local copy, do:

$ cabal unpack Yampa ## Or git clone this-repo
$ cd Yampa-*
$ cabal init
$ cabal install --only-dependencies
$ cabal configure && cabal haddock --internal

Documentation is also available online:

Papers and technical reports

Related projects

Help and collaboration

You can collaborate at least in three ways:

  • File an issue (

  • Write documentation (send a link and/or a pull request).

  • Research: we are constantly trying to improve Yampa. We'd be glad to have collaborators. If you are working on this, please, let us know.

    (Interactivity and FRP is the main topic of my (ongoing) work and research, so I'll keep working on this for some time. -- Ivan Perez)


  • Henrik Nilsson
  • Antony Courtney


  • Ivan Perez
You can’t perform that action at this time.