Uno Platform (/ˈuˌnoʊ/) is an open source cross-platform graphical user interface that allows WinUI and Universal Windows Platform (UWP) - based code to run on iOS, macOS, Linux, Android, and WebAssembly.

[3][4] Uno Platform is released under the Apache 2.0 license.

Applications can be built by using the UWP tools in Visual Studio on Windows, including XAML and C# Edit and Continue, and run on iOS, Android or in WebAssembly in a web browser.

[5] A plug in for Microsoft Visual Studio is available from Microsoft's Visual Studio Marketplace.

[6] The community surrounding Uno Platform open source project comes together at its annual conference UnoConf.