# flexxui/flexx

Write desktop and web apps in pure Python

Repository: https://github.com/flexxui/flexx
Canonical: https://ross.abutalabs.com/products/flexx
Homepage: http://flexx.readthedocs.io
Language: Python
License: BSD-2-Clause
License Family: permissive
Topics: python, ui, web, html5
Last push: 2025-01-20T15:55:39+00:00

## Health v2 (maintenance only)
Score: 33/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 2, release rhythm 35, longevity 100
- inputs: {"age_days": 4382, "days_push": 590, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3329, forks 254 (observed 2026-08-28T04:07:56.556413+00:00)

## What it is
Flexx is a pure Python GUI toolkit that uses web technology (HTML5/JavaScript) for rendering, transpiling Python to JavaScript via PScript. It can build cross-platform desktop apps, web apps, standalone HTML documents, and works in Jupyter notebooks.

## Use cases
- write desktop apps in pure python
- build web apps without writing javascript
- create interactive scientific dashboards in python
- export a python app to a standalone html file
- run python guis inside jupyter notebooks
- mix server-side and browser-side python code

## When to choose
- you want a pure-Python GUI toolkit with no JavaScript required
- you need one codebase to target desktop, web, and standalone HTML
- you work in scientific/Jupyter contexts and want interactive UIs

## When to avoid
- you need a large ecosystem of native widgets or mobile support
- you require a framework with heavy active development and large community
- you need fine-grained control over modern frontend tooling like React or Vue

## Facets
- artifact type: framework
- maturity: maintenance
- function: ui-components, web-framework, gui, templating
- domain: web-development, desktop-applications, cross-platform, developer-tools
- platform: python, cross-platform, browser
- tags: pure-python, pscript, tornado, jupyter, gui-toolkit, html5, web-server

## Member repositories
- flexxui/flexx (main) score 33

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:56.556413+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:41:44.440138+00:00, confidence not recorded.
  - readme: https://github.com/flexxui/flexx (fetched 2026-08-28T04:07:56.556413+00:00, sha fabfee9ded9b)
- Data as of 2026-08-30T08:39:29.467469+00:00.