Thew day ends in a Y, so Microsoft is launching a new way to build Windows applications. Get excited, Windows application developers! If you caught our session at Microsoft Build 2026 or you’ve been watching the repo, you’ve seen this one taking shape in public for a while now, and a lot has changed since Build. Here’s the longer tour: Microsoft.UI.Reactor, an experimental C# framework that brings the MVU (Model-View-Update) pattern to WinUI desktop apps. No XAML files, no code-behind, no ViewModels. Two things before the fun part. Reactor is experimental: no support policy, no API guarantees, published this early on purpose because we’d rather hear we got the design wrong now than once people have shipped on it. And it is not a replacement for XAML or MVVM, which we’ll come back to. ↫ Alexandre Zollinger Chohfi at Microsoft’s Dev Blogs At multiple points in the linked blog post, Microsoft underlines that no, Reactor is not going to replace XAML. I’m sure Windows developers who learned Win32, Silverlight, WinRT XAML, WPF, UWP, WinUI 2 and 3, and all the others, over the past two decades will feel deeply comforted by Microsoft’s insistence that Reactor will not replace XAML. Microsoft repeats: this won’t replace XAML. They swear.
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