Introduction

Build multi-platform apps in Python powered by Flutter

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

⚡️ From idea to app in minutes#

An internal tool or a dashboard for your team, weekend project, data entry form, kiosk app, or high-fidelity prototype - Flet is an ideal framework to quickly hack great-looking interactive apps to serve a group of users.

📐 Simple architecture#

No more complex architecture with JavaScript frontend, REST API backend, database, cache, etc. With Flet you just write a monolith stateful app in Python only and get multi-user, real-time Single-Page Application (SPA).

🔋 Batteries included#

To start developing with Flet, you just need your favorite IDE or text editor. No SDKs, no thousands of dependencies, no complex tooling - Flet has a built-in web server with assets hosting and desktop clients.

Powered by Flutter#

Flet UI is built with Flutter, so your app looks professional and could be delivered to any platform. Flet simplifies the Flutter model by combining smaller "widgets" to ready-to-use "controls" with an imperative programming model.

📱 Deliver to any device or platform#

Package your Flet app as a standalone desktop app (for Windows, macOS, and Linux), mobile app (for iOS and Android), dynamic/static Web app or as a Progressive Web App (PWA).

Flet app example#

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

counter.py

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)
        page.update()

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

    page.add(
        ft.Row(
            alignment=ft.alignment.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, update the last line in your script to:

ft.run(main, view=flet.AppView.WEB_BROWSER)

Alternatively, you can use the --web flag when running the flet run command:

flet run --web counter.py

Learn more#

Community#

Contributing#

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