flet

What it is and what it does

Flet is a Python framework that lets you write cross-platform applications—for iOS, Android, Windows, Linux, macOS, and web—all in Python without needing to learn Dart, Swift, Kotlin, HTML, or JavaScript. It wraps Flutter's rendering engine and provides a Python API to Material and Cupertino UI controls, layout primitives, dialogs, and charts. You write a single codebase and Flet handles compilation and packaging for each target platform.

The framework is designed for developers who want to ship native-looking apps quickly without frontend expertise. It includes built-in packaging tools to generate standalone executables and app bundles, supports real-time testing on mobile devices via the Flet App, and can deploy web apps either as WebAssembly-based client-side apps or as server-side Python web applications with live UI updates. It depends on httpx, oauthlib, msgpack, repath, and typing-extensions for HTTP, authentication, serialization, and utility functions.

Use it for:

• Build a cross-platform desktop application (Windows, macOS, Linux) from a single Python codebase without Electron
• Create a mobile app for iOS and Android that you can test on your own device and deploy to app stores
• Develop a web application that runs in modern browsers using WebAssembly, with no server infrastructure required
• Prototype a data-driven dashboard or tool that needs to run on multiple platforms with consistent UI
• Wrap Python libraries like numpy, pandas, or opencv in a native GUI for distribution to end users

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

Flet is a Python framework for building cross-platform mobile, desktop, and web applications without requiring frontend development experience or knowledge of platform-specific languages.

Yes, if you want to build cross-platform apps in pure Python without learning frontend languages or frameworks. The project is actively maintained, has no known vulnerabilities, and offers a permissive license. Install friction is low. The main gotcha is the Python 3.10 requirement and the need for platform-specific tooling to package for mobile and desktop—not a blocker for web or desktop development on your own machine, but worth planning for if you intend to ship to app stores.

Install

flet on PyPI

pip install flet

uv add flet

poetry add flet

Installing flet

Before you install

Installation is straightforward with a pure-Python wheel. The package has low install friction and active maintenance—the repository shows recent commits and the project released within the last two weeks.

License in practice

Licensed under Apache-2.0 (permissive), so you can use Flet in commercial and private projects without restriction, though you must include a copy of the license.

Quickstart

pip install 'flet[all]'

import flet as ft

def main(page: ft.Page):
    page.add(ft.Text("Hello, Flet!"))

ft.run(main)

Requires Python 3.10 or later. Desktop and mobile builds require platform-specific tooling; web deployment uses WebAssembly.

Verify before relying

• Whether the 150+ built-in controls and 50+ Python packages for iOS/Android mentioned in the description are current as of version 0.86.5
• Performance characteristics and limitations when running complex apps via WebAssembly on web
• Maturity and stability of iOS/Android packaging relative to desktop platforms

Package facts

Evidence: flet-0.86.5-py3-none-any.whl

Tags

More Application Frameworks packages