UIng Guide

Native desktop apps in Crystal

UIng is a Crystal binding for libui-ng. Build small, cross-platform interfaces with the native controls of Linux, macOS, and Windows.

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One API, native controls

UIng uses the platform's native GUI toolkit: GTK on Linux, AppKit on macOS, and Win32 on Windows. Use the regular object-oriented API or the optional block-based DSL; both create the same controls.

require "uing"

UIng.init

window = UIng::Window.new("Hello World", 300, 200)
window.on_closing do
  UIng.quit
  true
end

window.child = UIng::Label.new("Hello from UIng")
window.show

UIng.main
UIng.uninit