flet · PyPI

Build multi-platform apps in Python. No frontend experience required.

Flet is a framework that allows building mobile, desktop and web applications in Python only without prior experience in frontend development.

Single code base for any device

Your app will equally look great on iOS, Android, Windows, Linux, macOS and web.

Build an entire app in Python

Build a cross-platform app without knowledge of Dart, Swift, Kotlin, HTML or JavaScript - only Python!

150+ built-in controls and services

Beautiful UI widgets with Material and Cupertino design: layout, navigation, dialogs, charts - Flet uses Flutter to render UI.

50+ Python packages for iOS and Android

Numpy, pandas, pydantic, cryptography, opencv, pillow and other popular libraries.

Full web support

Flet apps run natively in modern browsers using WebAssembly and Pyodide, with no server required. Prefer server-side? Deploy as a Python web app with real-time UI updates.

Built-in packaging

Build standalone executables or bundles for iOS, Android, Windows, Linux, macOS and web. Instantly deploy to App Store and Google Play.

Test on iOS and Android

Test your project on your own mobile device with Flet App. See your app updates as you make changes.

Extensible

Easily wrap any of thousands of Flutter packages to use with Flet or build new controls in pure Python using built-in UI primitives.

Accessible

Flet is built with Flutter which has solid accessibility foundations on Android, iOS, web, and desktop.

Flet app example

Below is a simple "Counter" app, with a text field and two buttons to increment and decrement the counter value:

import flet as ft

def main(page: ft.Page):
    page.title = "Flet counter example"
    page.vertical_alignment = ft.MainAxisAlignment.CENTER

    input = ft.TextField(value="0", text_align=ft.TextAlign.RIGHT, width=100)

    def minus_click(e):
        input.value = str(int(input.value) - 1)

    def plus_click(e):
        input.value = str(int(input.value) + 1)

    page.add(
        ft.Row(
            alignment=ft.MainAxisAlignment.CENTER,
            controls=[
                ft.IconButton(ft.Icons.REMOVE, on_click=minus_click),
                input,
                ft.IconButton(ft.Icons.ADD, on_click=plus_click),
            ],
        )
    )

ft.run(main)

To run the app, install flet:

pip install 'flet[all]'

then launch the app:

flet run counter.py

This will open the app in a native OS window - what a nice alternative to Electron! 🙂

To run the same app as a web app use --web option with flet run command:

flet run --web counter.py

Learn more

Community

Contributing

Want to help improve Flet? Check out the contribution guide.

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