libui-python¶

Native GUI toolkit for Python. Lightweight bindings for libui-ng — real native widgets on Linux (GTK+3), macOS (Cocoa), and Windows (Win32).

No Electron. No web views. Just native controls.

Features¶

30+ native widgets — buttons, entries, sliders, tables, color pickers, drawing surfaces, and more
Declarative API — reactive state, composable components, two-way data binding
Async-first — built-in asyncio integration with thread-safe UI updates
Cross-platform — one codebase, native look and feel everywhere

Quick example¶

import libui
from libui.declarative import App, Window, VBox, Label, Button, State

async def main():
    app = App()
    count = State(0)

    app.build(window=Window(
        "Hello", 400, 300,
        child=VBox(
            Label(text=count.map(lambda n: f"Count: {n}")),
            Button("Click me", on_clicked=lambda: count.update(lambda n: n + 1)),
        ),
    ))

    app.show()
    await app.wait()

libui.run(main())