WinUI 3 is the recommended native UI framework for building new Windows desktop applications. It brings the Fluent Design System, high-performance rendering, and a powerful XAML-based programming model to both C# and C++ developers.

Delivered as part of the Windows App SDK, WinUI enables you to create modern, polished, and responsive desktop experiences that run on Windows 10, version 1809 (build 17763) and later, including Windows 11.

That’s the promise anyway. You can program in .NET (C#) or C++ with XAML markup to build apps that run across x86, x64, and ARM devices.

While I applaud the effort, one has to wonder the logic. OS lockin to Windows is largely a thing of the past with most apps being web-based. Almost no company wants single-platform solutions. The cases that need a truly native application are very limited – things like games (which don’t need native UIs), and performance/productivity tools that directly access hardware. I worked on one such app for many years, but those kinds of apps are growing fewer and farther between.

What would be more amazing is if such a framework could also sit as a shim under old Win32 and older native/.NET apps and automatically update them to the new look and feel as well as provide this new UI interface. I realize that may not be possible without breaking lots of apps, but it could be amazing for those apps it does work for. Maybe something for Microsoft to think about…