flet-contributive 2025.3.18.2311

Flet for Python - easily build interactive multi-platform apps in Python

Flet - quickly build interactive apps for web, desktop and mobile in Python

Flet is a rich User Interface (UI) framework to quickly build interactive web, desktop and mobile apps in Python without prior knowledge of web technologies like HTTP, HTML, CSS or JavaScript. You build UI with controls based on Flutter widgets to ensure your programs look cool and professional.

Requirements

• Python 3.7 or above on Windows, Linux or macOS

Installation

pip install flet

Create the app

Create main.py file with the following content:

import flet as ft

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

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

    def minus_click(e):
        txt_number.value = str(int(txt_number.value) - 1)
        page.update()

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

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

ft.app(main)

Run as a desktop app

The following command will start the app in a native OS window:

flet run main.py

Run as a web app

The following command will start the app as a web app:

flet run --web main.py

Learn more

Visit Flet website.

Continue with Python guide to learn how to make a real app.

Browse for more Flet examples.

Join to a conversation on Flet Discord server.