What's New for developers

Some recent documentation highlights

Feature	Description
Start developing Windows apps	Learn how to start developing apps for Windows with this comprehensive guide.
PowerToys	PowerToys is a set of utilities for power users to tune and streamline their Windows experience for greater productivity.
Installing PowerToys	Step-by-step instructions to install PowerToys on your Windows machine.
Get started building an app with Windows Copilot Runtime APIs	A guide to help you begin building apps using Windows Copilot Runtime APIs.
AppWindows.SetIcon Method	Documentation for the AppWindow.SetIcon method in the Windows App SDK.
Win32 app isolation overview	An overview of app isolation for Win32 applications to enhance security and reliability.

Windows App SDK

Feature	Description
Windows App SDK	The Windows App SDK is a set of developer components and tools that represent the next evolution in the Windows app development platform. The Windows App SDK provides a unified set of APIs and tools that can be used in a consistent way by any desktop app on Windows 11 (and downlevel to Windows 10, version 1809).
Windows App SDK release notes	Details on the latest stable release of the Windows App SDK, which can be used by apps in production environments and by apps published to the Microsoft Store.
Create a new app with the Windows App SDK	The Windows App SDK includes WinUI 3 project templates that enable you to create apps with an entirely WinUI-based user interface. When you create a project using these templates (see Create your first WinUI 3 project), the entire user interface of your application is implemented using windows, controls, and other UI types provided by WinUI 3.
Use the Windows App SDK in an existing project	If you have an existing project in which you want to use the Windows App SDK, you can install the latest version of the Windows App SDK NuGet package in your project. Unpackaged apps must follow this procedure to use the Windows App SDK, but packaged apps can do this too.
Download the Windows App SDK	There are several packages and release channels for the Windows App SDK. The Download the Windows App SDK page provides guidance on which ones you need, download links, and installation instructions.

WinUI

Feature	Description
WinUI	WinUI is the native UI platform component that ships with the Windows App SDK (completely decoupled from Windows SDKs). The Windows App SDK provides a unified set of APIs and tools that can be used to create production desktop apps that target Windows 10 and later, and can be published to the Microsoft Store.

Windows AI

Feature	Description
Windows AI	Enhance your Windows apps with AI through local APIs and Machine Learning models.
Windows Copilot Runtime Overview	Windows Copilot Runtime introduces new ways of interacting with the operating system that utilize AI, such as Phi Silica, the Small Language Model (SLM) created by Microsoft Research that is able to offer many of the same capabilities found in Large Language Models (LLMs), but more compact and efficient so that it can run locally on Windows.

Developer tools

Feature	Description
Dev Home Overview	Dev Home was an experimental control center for Windows, but will no longer be supported beginning May 2025. Dev Home provided the ability to monitor projects in your dashboard using customizable widgets, set up your dev environment by downloading apps, packages, or repositories, connect to your developer accounts and tools (such as GitHub), and create a Dev Drive for storage all in one place.
WSL (Windows Subsystem for Linux)	Windows Subsystem for Linux (WSL) is a feature of Windows that allows you to run a Linux environment on your Windows machine, without the need for a separate virtual machine or dual booting.

Samples

The WinUI 3 Gallery on GitHub is updated regularly to showcase the latest additions and improvements to WinUI in the Windows App SDK. The gallery app can also be downloaded from the Microsoft Store.