Build 2026 was the year Microsoft stopped hedging. After years of shipping Windows 11 features wrapped in web code, React Native feeds, Electron apps, WebView-powered interfaces, the company confirmed it is ripping those components out and rebuilding them in native WinUI.
Led by Partner Architect Rudy Huyn, a dedicated team is rewriting core shell elements including the Start menu's Recommended feed and All Apps list, which originally shipped as React Native wrappers. The goal: eliminate the sluggish feel that has plagued Windows 11 since launch.
"We've started to integrate it into the shell at a much faster rate," Chris Anderson, VP of software engineering at Microsoft, said during a Build 2026 session. "You're going to see a lot of the first-party features coming from Microsoft being built on top of WinUI." The move carries weight because Microsoft spent years telling third-party developers to build native Windows apps while its own operating system ran on web components. That contradiction is now being dismantled.
Architectural upgrades have already landed in public GitHub repositories and will appear in upcoming experimental previews of the Windows App SDK, according to the company.
Microsoft's framework history is a graveyard: Silverlight, WinRT XAML, UWP, and now WinUI 3. Developers have been burned by platform shifts before, and Microsoft knows it.
Anderson confirmed the company has "no intention of building a new framework." The engineering teams are dropping the "3" from WinUI 3 branding and will refer to the platform simply as WinUI.
"In fact, we're dropping the number because we have no intention of making a massive shift, breaking change on it," Anderson said. The rebranding is a signal of stability. WinUI is four years old, and Microsoft's most-asked developer question has been whether another framework will replace it. The answer, according to Build 2026 sessions, is no.
Anderson told attendees the team first needs to "earn the right to build new features by fixing the absolute basics." That means squashing bugs, reducing memory usage, and addressing visual tearing in WinUI apps, a problem Windows Latest documented where black borders appear during window resizing.
"We've invested heavily in really improving memory usage as well as switching over to a system compositor," Anderson said.
Microsoft is also adding DataGrid and Charting controls, basic enterprise staples for finance apps, admin dashboards, and billing software. These are overdue additions that signal Microsoft is treating enterprise WinUI development as a priority rather than an afterthought.
To push adoption further, Microsoft released a dedicated WinUI agent plugin for GitHub Copilot and Claude Code. The plugin gives AI assistants WinUI-specific skills, addressing a problem where generic coding models produce unoptimized results for Windows-native development. A Build 2026 session titled "Use agents to build WinUI 3 apps" demonstrated how AI agents can create new WinUI apps from scratch, improve existing projects, and assist migration from older frameworks. Microsoft also previewed new WinUI 3 templates designed to reduce setup time. The software giant recently created a dedicated team focused on building what it internally describes as "100% native" Windows applications and experiences. Microsoft UI Reactor, a new experimental open-source project, allows developers to build native WinUI applications entirely in C# without touching XAML.
Microsoft said it has no plans to war against cross-platform frameworks, Windows remains an open platform. But the message from Build 2026 is clear: if you want your app to feel fast on Windows 11, build it the way Microsoft is now building Windows itself.
