libui is a native C GUI library and cross-platform framework used to build desktop applications. It provides a unified C abstraction layer and a native widget toolkit that maps directly to the host operating system's original controls, windows, and menu bars.
The project functions as a portable UI wrapper, employing platform-specific backends and a native-API wrapper to maintain visual and behavioral fidelity across different operating systems. It utilizes a C-language binding layer to ensure portability across various compilers and targets.
The library covers native interface construction and window layout management through abstracted containers and alignment controls. It includes capabilities for user input event handling via callbacks, component visibility management, and manual event loop control to coordinate background tasks with interface updates.