Build production-ready Python UI apps with architecture patterns inspired by GetX
Reactive state • Modular routing • Clean architecture • Developer productivity

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FletX is an architectural framework that brings production-grade patterns to Flet applications. Built on proven GetX principles, it combines reactive state management, modular routing, and dependency injection—all with zero boilerplate.

See FletX in action across different platforms:

Web	Mobile
Desktop

Get a production-ready app running in under 3 minutes:

# 1. Install (Python 3.10+) pip install FletXr[dev] --pre # 2. Create new project fletx new my_project cd my_project # 3. Run with hot reload fletx run --web --watch

That's it! Your app is now running in the browser with live reload. Every save triggers instant feedback.

my_project/ ├── app/ │ ├── controllers/ # State & business logic │ ├── services/ # APIs, storage, utilities │ ├── pages/ # UI screens │ ├── components/ # Reusable widgets │ └── routes.py # All routes in one place ├── assets/ # Images, fonts, etc. ├── tests/ # Automated tests ├── pyproject.toml # Dependencies & config └── main.py # Entry point 

Every file generated by fletx generate follows FletX conventions—no guessing, no inconsistency.

import flet as ft from fletx.app import FletXApp from fletx.core import FletXPage, FletXController, RxInt from fletx.navigation import router_config from fletx.decorators import obx class CounterController(FletXController): def __init__(self): self.count = RxInt(0) # Reactive state super().__init__() def increment(self): self.count.increment() # UI auto-updates class CounterPage(FletXPage): ctrl = CounterController() @obx # 🪄 Magic: auto-tracks reads, rebuilds on change def counter_display(self): return ft.Text( f"Count: {self.ctrl.count}", size=50, weight="bold", color = 'red' if not self.ctrl.count.value % 2 == 0 else 'white' ) def build(self): return ft.Column(controls=[ self.counter_display(), ft.ElevatedButton( "+1", on_click=lambda _: self.ctrl.increment() ), ]) if __name__ == "__main__": # Defining route router_config.add_route( path = '/', component = CounterPage ) app = FletXApp(title="Counter", initial_route="/", debug=True) app.run()

No boilerplate. No manual rebuilds. Just reactive state.

Build scalable apps with separation of concerns:

class UserController(FletXController): def __init__(self): self.users = RxList([]) self.selected = RxInt(-1) super().__init__() def fetch_users(self): # Async-friendly, auto-notifies UI users = api.get_users() self.users.set(users) def select(self, index): self.selected.set(index)

class UserPage(FletXPage): ctrl = UserController() @obx def user_list(self): return ft.Column(controls=[ ft.Text(user.name) for user in self.ctrl.users ]) def build(self): return self.user_list()

class ApiService(FletXService): def get_users(self): # HTTP calls, caching, error handling pass

from fletx.navigation import router_config, navigate router_config.add_route("/users/:id", UserDetailPage) navigate("/users/123") # Fully type-checked

from fletx.decorators import reactive_debounce, reactive_memo @reactive_debounce(0.5) # Debounce at 500ms def search(query): pass @reactive_memo(maxsize=100) # Memoize results def expensive_compute(n): pass

FletX users report:

• 50% faster development — Scaffold → code → deploy in hours, not days
• 0 boilerplate — Pre-built patterns for common patterns
• 10k+ downloads — Trusted by developers building production apps
• Active community — Daily updates, responsive maintainers, helpful Discord

✅ Full-featured CLI — fletx new, fletx generate, fletx run, fletx test
✅ Reactive primitives — RxInt, RxStr, RxList, RxDict, Computed
✅ Smart decorators — @obx, @reactive_debounce, @reactive_memo, and 10+ more
✅ Built-in DI — Global service container with tag-based lookup
✅ Testing support — Built-in utilities for unit & integration tests
✅ TypeScript-grade IDE support — Full autocomplete and type hints
✅ Active maintenance — Bug fixes, features, and community updates

# Create & manage projects fletx new my_project --author "You" fletx generate controller Home --with-test fletx generate service Api fletx generate page Settings # Development & testing fletx run --web --watch # Browser + hot reload fletx run --desktop # Desktop window fletx run --android # Android device fletx test --coverage # Test with coverage # Validation fletx check --json # Verify compatibility

We're building FletX together. Here's how you can help:

• ⭐ Star us on GitHub — Every star helps new developers find us
• 🐛 Report issues — Found a bug? Open an issue (we fix them fast)
• 💡 Suggest features — Have an idea? Discussions are open
• 📝 Write docs — Help improve guides and examples
• 🔧 Contribute code — PRs welcome, see CONTRIBUTING.md
• 💬 Join Discord — Chat with maintainers and other developers

Ready to build?

1. Install FletX (2 min)
2. Create your first project (3 min)
3. Learn the patterns (15 min)
4. Build something awesome (∞ min)

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