Ribir is a GUI framework built with Rust that enables developers to create multi-platform applications from a single codebase. It focuses on a data-driven approach to UI development, meaning that changes in data automatically update the user interface. This allows developers to concentrate on structuring their data and APIs without getting tangled in UI logic. The framework includes a simple example of a counter application, demonstrating how to use its features without a domain-specific language (DSL). The framework offers a variety of features, including a widget composition system with four widget types that allow flexibility in implementation. Non-intrusive state management lets data changes reflect in the UI seamlessly. Ribir's layout system, inspired by Flutter, and its event system, which supports bubbling and capturing, enhance interactivity. The theme system allows for dynamic modifications, while the Painter component translates views into 2D paths for rendering. Currently, Ribir supports Linux, Windows, macOS, and the web, with limited functionality on mobile platforms like iOS and Android. Ribir is in active development, with ongoing testing and integration for desktop and web environments. Mobile support will be prioritized after stabilizing the core framework and the widget library. The community is encouraged to contribute through documentation improvements, bug fixes, and feature requests. Ribir is licensed under MIT, making it accessible for developers interested in using or contributing to the framework.