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Flet

Build real multi-platform apps in Python — Flutter-powered, no frontend experience required.

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About

Flet lets Python developers build interactive web, desktop, and mobile apps without touching JavaScript or Dart. You declare your UI in Python; Flet renders it with Flutter under the hood, so the same codebase ships to browsers, Windows, macOS, Linux, iOS, and Android.

It is a natural fit for AI projects: wrap a model, agent, or data pipeline in a polished chat UI or dashboard in an afternoon, with realtime updates and a component model that feels like Flutter's widget tree expressed in Python. With ~17,400 GitHub stars it is one of the most popular Python app frameworks, and it is Apache-2.0 licensed.

The honest caveat: you inherit Flutter's weight — app bundles are large, and deeply custom native-feeling mobile UX still wants real Flutter/Dart. For internal tools, demos, and AI app frontends it is excellent; for consumer mobile apps, think twice.

What it can do

  • Python-only UI code shipping to web, desktop, and mobile from one codebase
  • Flutter rendering engine underneath for native-quality widgets
  • Realtime UI updates, routing, theming, and a rich control set
  • Ideal for AI app frontends: chat UIs, dashboards, demos
  • Apache-2.0 licensed; ~17.4k GitHub stars

Setup

  1. pip install flet (Python 3.8+).
  2. Write main.py with a main(page: ft.Page) function declaring your UI.
  3. Run flet run main.py for web, or flet build targets for desktop/mobile packages.
  4. Deploy the web build anywhere static hosting works.

Prerequisites

Python 3.8+; Flutter SDK only needed for native mobile/desktop packaging.

Use cases

app-buildinguipythondeveloper-toolsprototyping

Works with

Trust score — 9/10

/10 trustMetrics-checked

Scored 9/10 (metrics tier, metrics-v1). Evidence: Adoption 8: starScore from 17,371 stars on flet-dev/flet; Maintenance 9: pushed 2026-10-15 (recency 10); frequent releases assumed 8; issues ratio 265/17371 -> 7; Manual 8: docs verified; deduction: Flutter bundle weight, mobile UX caveat for consumer apps. License: Apache-2.0.

★ 17,371 GitHub stars

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
8.0/10
Maintenance · recency, releases, issue load
9.0/10
Openness · license + docs
10.0/10
Manual review · sanity read + red-flag check
8.0/10
  • · Adoption 8: starScore from 17,371 stars on flet-dev/flet
  • · Maintenance 9: pushed 2026-10-15 (recency 10); frequent releases assumed 8; issues ratio 265/17371 -> 7
  • · Manual 8: docs verified; deduction: Flutter bundle weight, mobile UX caveat for consumer apps

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.