Microsoft Open Sources XAML Studio: Reviving Prototyping for WinUI & UWP Developers (2026)

Reviving a Classic: Microsoft Opens XAML Studio to the World!

Ever felt the frustration of slow UI prototyping? Microsoft has a solution! They've officially opened the doors to XAML Studio, a lightweight tool designed to speed up your XAML-based UI development, by open-sourcing it under the .NET Foundation. This move marks a significant shift, potentially changing the way developers create user interfaces.

Originally born from a 2017 hackathon, XAML Studio, once known as 'XamlPad+', was a side project aiming to breathe new life into classic tools like XamlPad and Kaxaml. It evolved into a standalone application focused on WinUI and UWP prototyping. Before this open-source release, development was mainly internal, with some components shared via the Windows Community Toolkit. Now, with its new home on GitHub, the community can contribute and collaborate.

But here's where it gets exciting: The current release is packed with major updates, specifically targeting version 2.0. These updates, found in the dev branch, showcase a complete UI redesign based on Fluent principles. You'll also find improved integration with WinUI 3, and features like live data context, property inspectors, and layout alignment tools. Plus, it brings back features from the original prototype, such as folder support, which didn’t make it into the initial XAML Studio 1.0 release.

This open-source move signifies a new era for XAML Studio. As a seed project within the .NET Foundation, it's now set for continuous community involvement. Although the idea of open sourcing dates back to August 2017, the project has only now reached a stage suitable for public development.

Important Note: While the code is available, version 2.0 is still under development and not yet considered stable. Some features are experimental, and documentation is still evolving. Keep in mind that compatibility with legacy UWP workflows is partial, and integration with Visual Studio is limited.

And this is the part most people miss: The release is a boon for WinUI and XAML developers seeking rapid feedback without the complexities of full project scaffolding. It opens the door to community contributions, issue tracking, and roadmap visibility, paving the way for future improvements.

Interested developers can dive into the GitHub repository, review the updated roadmap, and participate in discussions or pull requests. Microsoft’s announcement blog and the GitHub discussions thread provide more context on the project's history and vision.

What do you think? Will this open-source move revolutionize XAML development? Do you see any potential challenges or opportunities? Share your thoughts in the comments below!

Microsoft Open Sources XAML Studio: Reviving Prototyping for WinUI & UWP Developers (2026)

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