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Windows UI Library Overview

WinUI is the modern native UI platform for Windows with two active generations:

  1. WinUI 3: The latest, 3rd generation of WinUI that ships the entire WinUI stack decoupled from the operating system as a part of the Windows App SDK.

  2. WinUI 2: The previous generation of the WinUI stack for UWP apps, consisting of a XAML and Visual Layer built directly into the Windows 10 operating system, and a controls library built on top of the OS, delivered via NuGet, and hosted at this repository. WinUI 2 will continue to be supported with bug, reliability, and security fixes.

**For a detailed look on the difference between WinUI 2 & 3, please view our comparison table

Benefits of WinUI

WinUI provides a number of benefits which makes it the best way to create user interfaces for Windows apps:

  1. The native UI platform of Windows
    WinUI is the highly-optimized native UI platform used to create Windows itself, now made more broadly available for all developers to use to reach Windows. It's a thoroughly tested and proven UI platform that powers the operating system environment and essential experiences of 1 billion+ Windows 10 & 11 PC, XBox One, HoloLens, Surface Hub and other devices.

  2. The latest advancements in Fluent Design
    WinUI is Microsoft's main focus for native, accessible Windows UI and controls and is the definitive source for the Fluent Design System on Windows.
    It will also support the latest composition and rendering innovations like vector animations, effects, shadows and lighting.

  3. Backward compatibility for new features
    New WinUI features will continue to be backward-compatible with a wide range of Windows 10 and 11 versions. With WinUI 3, you can start building and shipping apps with new features immediately as soon as they're released, without having to wait for your users to be running the latest update of Windows.

  4. Native development support
    WinUI can be used with .NET, but doesn't depend on .NET: WinUI is 100% C++ and can be used in unmanaged Windows apps, for example using standard C++17 via C++/WinRT.

  5. More frequent updates
    WinUI is planned to ship roughly every 6 months, with at least two preview builds per stable release. This is more of a guideline than a rule, but that is what the team strives for.

  6. Open source development and community engagement
    The WinUI 2 Controls Library is already open source on GitHub, and we're planning to add the full WinUI 3 framework into this repo as well. You can engage directly with Microsoft's core engineering team and contribute bug reports, feature ideas, and even code: see the Contribution Guide for more info. You can also try out the pre-release builds to see new in-development features and help shape their final form.

WinUI 3

WinUI 3 is the latest generation of native Windows UI, consisting of all the major UX layers of Windows decoupled and shipping as a standalone solution for you to use.

It focuses on enabling three main use cases:

  1. Modernizing existing apps
    • Enabling you to extend existing Win32 (WPF, WinForms, MFC...) apps with modern Windows UI at your own pace using the upcoming release of Xaml Islands. Developers who currently use WinUI 2 for their app UX will be able to easily move to WinUI 3, as their syntax and capabilities are very similar
  2. Creating new Windows apps
    • Enabling you to easily create new modern Windows apps with the flexibility offered by the Windows App SDK
  3. Enabling other frameworks
    • Providing the native implementation for other frameworks like React Native and .NET MAUI when running on Windows.

WinUI 3 is available as a part of the Windows App SDK for building stable and supported desktop/Win32 apps for production scenarios. The latest release is the Windows App SDK 1.2, which you can download and read more about at the documentation linked below:

Stable release channel for the Windows App SDK

We also ship experimental features as we develop them. You can read more about the Windows App SDK Experimental releases at the following documentation. Note that Experimental releases have limitations and known issues, so they are not equipped for production apps.

Experimental release channel for the Windows App SDK.

Roadmap

For more info about upcoming features in the next release of WinUI 3, see the Windows App SDK feature roadmap.

WinUI 2 Controls Library

WinUI 2 is a native user experience (UX) framework for both Windows desktop and UWP applications tightly integrated with Windows 10 and above SDKs.

The latest release of the WinUI 2 Controls Library was v2.8 which was released in July 2022. You can find a list of what was introduced in this release in the release notes.

At this time, there are no plans for a WinUI 2.9. However, WinUI 2 will continue to be supported through servicing releases with bug, reliability, and security fixes as needed.

For installation instructions see Getting started with the Windows UI Library.