flet-dev/flet

What is it?

Key features

• 01Single Python codebase targets six platforms: iOS, Android, Windows, macOS, Linux and web.
• 02150+ built-in controls with Material and Cupertino styling.
• 03Declarative and imperative UI styles are both supported.
• 04Python apps can run in the browser via Pyodide or be served with real-time updates.
• 05`flet build` packages apps for desktop, mobile and web distribution.
• 06`flet test` runs pytest integration tests against packaged apps.

Use cases

• Building internal tools or dashboards in Python without learning JavaScript or Dart.
• Shipping a single Python app to desktop, mobile and web.
• Creating mobile apps that use NumPy, pandas or Pillow.
• Prototyping a GUI for a Python script or data workflow.

Quick start

1. 1

   Install the flet package

   pip install 'flet[all]'
2. 2

   Save the counter example as counter.py (copy the code from the README)

3. 3

   Launch the app in a native desktop window

   flet run counter.py
4. 4

   Optionally run the same app in your browser

   flet run --web counter.py

Things to know

• !Mobile packaging and some features need extra tooling such as flet build, which adds setup complexity.
• !Running Python on mobile with native libraries depends on Flet's prebuilt binary packages.

Topics

FAQ

What is flet?

Python framework for building web, desktop and mobile apps with a Flutter-based UI, no frontend experience needed. Flet lets developers write both the interface and the application logic in Python. Apps built with it run on iOS, Android, Windows, macOS, Linux and the web, and the framework ships with more than 150 built-in controls covering layouts, forms, navigation and dialogs, styled with Material and Cupertino designs.

Is flet free to use? What license does it have?

flet is open source under the Apache-2.0 license. Check the license terms before using it in commercial products.

Is flet still maintained?

Actively maintained. The last commit to flet was on Oct 19, 2026.

What can I use flet for?

Building internal tools or dashboards in Python without learning JavaScript or Dart. Shipping a single Python app to desktop, mobile and web. Creating mobile apps that use NumPy, pandas or Pillow. Prototyping a GUI for a Python script or data workflow.

How do I install flet?

Install the flet package: pip install 'flet[all]' Save the counter example as counter.py (copy the code from the README) Launch the app in a native desktop window: flet run counter.py Optionally run the same app in your browser: flet run --web counter.py

Where can I get flet?

The source code and installation instructions are on GitHub: https://github.com/flet-dev/flet