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Introduction to Flet

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

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Why Flet?

Flet empowers Python developers to create beautiful, production-ready applications across all platforms using the language they already know. No need to learn Dart, Swift, Kotlin, HTML, or JavaScript.

Single codebase

Write your app once and deploy it to iOS, Android, Windows, Linux, macOS, and web. Your app will look great on every platform.

Pure Python

Build complete cross-platform apps using only Python. Leverage the power of Flutter’s beautiful UI without leaving your favorite language.

150+ built-in controls

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

50+ Python packages

Use numpy, pandas, pydantic, cryptography, opencv, pillow, and other popular libraries on iOS and Android.

Full web support

Apps run natively in browsers using WebAssembly and Pyodide with no server required. Or deploy as a Python web app with real-time UI updates.

Built-in packaging

Build standalone executables or bundles for all platforms. Instantly deploy to App Store and Google Play.

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Key features

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Test on real devices

Test your project on your own mobile device with Flet App. See your app updates in real-time as you make changes during development.

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Extensible architecture

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

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Accessibility built-in

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

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How it works

Flet apps follow a simple pattern:
  1. Define your UI - Create controls like buttons, text fields, and layouts using Python objects
  2. Handle events - Write Python functions to respond to user interactions
  3. Update the UI - Modify control properties and Flet automatically updates the display
  4. Deploy anywhere - Run your app as a desktop app, web app, or mobile app
Flet uses Flutter as its rendering engine, giving you access to high-performance, beautiful UIs that feel native on every platform.

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Example: Hello World

Here’s a minimal Flet app that displays “Hello, world!”: 
import flet as ft

def main(page: ft.Page):
    page.add(ft.Text(value="Hello, world!"))

ft.run(main)
That’s it! This simple code creates a fully functional app that works on desktop, mobile, and web.

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Get started

Ready to build your first Flet app? Here’s what to do next:

Install Flet

Set up Flet on your development machine with pip or conda.

Quick start tutorial

Build your first interactive Flet app in minutes.

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Learn more

API Reference

Explore all available controls and their properties.

Examples

Browse sample applications and code snippets.

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Community

Join thousands of developers building with Flet:

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