The Windows User Library (WinUI) 3 is a user experience (UX) framework for developers creating native apps for Windows 10/11. It is the successor to WinUI 2, which targeted the deprecated Universal Windows Platform (UWP), and it is delivered as part of the new Windows App SDK, which replaced UWP. WinUI 3 is also a Windows implementation of the Fluent Design System, a cross-platform design s…