Avalonia (software framework)

Avalonia is a free and open-source.NET cross-platform XAML-based UI framework inspired by WPF/UWP and distributed under the MIT License. Avalonia supports the MVVM pattern.
It enables development of cross-platform applications using any.NET language, including C#, F# and VB.NET for Windows, Linux, macOS, iOS, Android and WebAssembly.
Avalonia supports multiple renderers, including Direct2D and Skia Graphics Engine, allowing it to operate on a broad range of platforms. Avalonia draws its entire UI, mirroring the approach taken by Flutter.

History

Avalonia, originally named Perspex, was first developed by Steven Kirk, with its initial commit made on 5 December 2013. The framework was conceived with the aim of creating a cross-platform UI framework, inspired by Windows Presentation Foundation.
Avalonia became part of the.NET Foundation on 1 April 2020, and left on 20 February 2024.
On 24 June 2025, Avalonia announced a $3 million sponsorship from Devolutions to support the continued development of the framework while maintaining its free and open-source nature.

IDE support

Avalonia maintains supports for the following IDEs and editors via plugins:

Other IDEs can be used with community-supported plugins, including JetBrains Rider.