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Welcome to the Clean Wiki! the online home of Clean.

Clean is a general purpose, state-of-the-art, pure and lazy functional programming language designed for making real-world applications. Some of its most notable language features are uniqueness typing, dynamic typing, and generic functions. Have a look at a quick impression of Clean.

The Clean System is available for the Windows, Linux, and Mac operating systems.

Downloading Clean

We are migrating towards continuous integration and more frequent releases. Both nightly developments builds and the traditionally versioned Clean 3.0 are publicly available from our download page.


The iTask System


Much of the current Clean related research is focused around the iTasks system. This is a toolkit for building web-based workflow management systems using a powerful workflow language embedded in Clean.

Read more about the iTasks system...



Cloogle is the official Clean search engine that indexes all standard libraries, external libraries, compiler errors, ABC instructions, builtins and syntax elements.

Read more about Cloogle...

Upcoming events


Learn more about the Clean language by downloading a distribution, the libraries, or reading the documentation, related publications, or FAQ.


Find out what is going on in the Clean community by checking out the projects that use Clean, reading the wishlist of Clean features, or joining our mailing lists.


Read more about the latest developments, upcoming and past events, or how to contact us.