Welcome to Flexx’s documentation!

Flexx is a pure Python toolkit for creating graphical user interfaces (GUI’s), that uses web technology for its rendering. Apps are written purely in Python; Flexx’ transpiler generates the necessary JavaScript on the fly.

You can use Flexx to create (cross platform) desktop applications, web applications, and (if designed well) export an app to a standalone HTML document. It also works in the Jupyter notebook.

The docs are on Readthedocs, the code is on Github, and there is a demo server on AWS and another on a Raspberry pi. Flexx is currently in alpha status; any part of the public API may change without notice. Feedback is welcome.

Flexx has a modular design, consisting of a few subpackages, which can also be used by themselves. See the table of contents below. For building apps these three modules are the most relevant:

Indices and tables