The Ubiquitous Larch
The Ubiquitous Larch

A Python-based interactive computing environment for your browser

Scientific computing

Interactive live documents

Live collaborative IDE

Data visualization

Notebook based interactive document system

  • Mix rich text and code (like IPython notebook)
  • Interactive output: results of computation can be more than static text and images; you can use JQuery controls to drive updates, audio and more...
  • Live documents: use Ubiquitous Larch to create live, interactive pages; see the built-in live documentation for an example.
  • Collaborative environment: changes made by you are seen in real-time by your collaborators, (not just to your code; your output objects are shared too). Build collaborative interfaces in Python with little effort.
  • Live Python objects: like Smalltalk, the entire programming environment (and the results your code creates) is composed of live objects.

Learn more about what Ubiquitous Larch can do.

Download it

Get Ubiquitous Larch here.


Minimal requirements: no libraries required

Works out-of-the-box with no additional python libraries.


Compatible with most Python VMs

Ubiquitous Larch runs on CPython, PyPy, Jython and IronPython.

This project is a web-based re-implementation of parts of The Larch Environment, a desktop based programming environment for Jython that features a novel mixed textual and visual programming system