microsoft/react-native-windows

React Native for Windows is a Microsoft-built extension of React Native, Meta's framework for building mobile apps using JavaScript and React, that adds support for building native Windows applications. React Native lets developers write app logic once in JavaScript and have it run on multiple platforms, this project extends that to Windows devices including PCs, tablets, Xbox, and mixed-reality headsets. The idea behind React Native is "learn once, write anywhere": a developer familiar with building web apps using React can apply those same skills to build native apps, without learning a completely separate language or toolset for each platform. With React Native for Windows, you write your app UI and logic in JavaScript (or TypeScript), and the framework bridges that to native Windows components, meaning the app behaves and looks like a proper Windows application, not a web page wrapped in a browser window. The rendering uses Windows' native composition system, and newer architecture targets WinAppSDK Win32 by default. The framework supports the Windows 10 SDK and all Windows devices that run it. It is primarily written in C++ (for the native rendering and bridge layer) and integrates with .NET and UWP (Universal Windows Platform). Microsoft also provides a React Native Gallery app on the Microsoft Store demonstrating available components interactively. You would use this if you are a JavaScript developer who wants to build a Windows desktop app (for PC, Xbox, or mixed reality) while sharing code and skills with an existing React Native mobile project.