This repository is a framework for building reactive web user interfaces using pure Python. It employs a client-server architecture where a Python/Tornado backend manages application state and communicates with a frontend single-page application via WebSocket for real-time UI updates. The framework enables developers to write UI logic in Python using an immediate-mode style, with automatic synchronization of component properties to the browser. Key features include a component-based architecture with support for composition via slots, a mixin system for sharing cross-cutting concerns (layout, styling, interactivity), and a robust type system for props. The frontend leverages Shoelace Web Components and Chart.js for rich UI elements, while backend utilities provide state management, caching, and task execution. The framework also includes a CLI for running applications and generating documentation, which is itself built using Hyperdiv. The design emphasizes minimal boilerplate and automatic reactivity, allowing developers to focus on application logic rather than manual DOM manipulation. Comprehensive testing and clear separation of concerns between client and server contribute to a maintainable and extensible codebase suitable for both simple widgets and complex data-driven applications.