Duck Framework
Build reactive web apps with Python (No JavaScript Required)
FreeWeb
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About
Duck Framework is an open-source Python web framework that lets developers build dynamic, real-time web applications without writing JavaScript. It includes a built-in reactive UI engine called Lively UI (Lively Component System), where interfaces are defined as Python components and updated instantly over WebSockets instead of full page reloads. The framework highlights a unified approach: backend logic and interactive UI are handled in one Python codebase, positioning it as an alternative to traditional Python frameworks like Django and Flask when reactive behavior is needed. It supports real-time component updates, virtual DOM diffing so only changed parts are patched, and seamless URL navigation without reloading the page. The site also provides installation and project scaffolding commands, documentation, and examples of apps built with Duck, such as a URL shortener, a counter demo, and an AI design generator.
Problem & solution
Problem
Building reactive web UIs usually requires JavaScript and separate frontend stacks.
Solution
Provides Python-only reactive UI with WebSockets, components, and virtual DOM diffing.
Who it's for
Python developers building real-time web apps without JavaScript.
Main features
- WebSocket-driven UI
- Reactive components
- Virtual DOM diffing
- URL navigation without reloads
- BSD-3 open source
Use cases
- Real-time dashboards in Python
- Python-only interactive web apps
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