Avalonia lets you build beautiful, high-performance apps for Windows, macOS, Linux, iOS, Android, and Web using a single codebase in .NET. It combines modern graphics rendering with a familiar XAML and MVVM architecture, making it easy for WPF developers to go cross-platform without compromise. Avalonia offers full control over the UI, excellent tooling, and a growing ecosystem, all while staying open source and community-driven.

Avalonia is developed and maintained by AvaloniaUI OÜ, a commercial entity established in 2019 to support the growing enterprise adoption of the framework. The company is bootstrapped, profitable, and owned by the core engineering team behind Avalonia. While the project remains fully open source, AvaloniaUI OÜ provides commercial services, sponsorship, and long-term stewardship.

Avalonia is used by companies of all sizes, from startups to global enterprises, across industries including finance, healthcare, aerospace, semiconductors, and developer tooling. Notable users include Autodesk, GitHub, JetBrains, Microsoft, VMware, ARM, AMD, Canon, Siemens, Schneider Electric, NASA, Deutsche Bank, Morgan Stanley, Unity, EA Games, and many more. Its adoption spans internal tools, commercial applications, running on desktop, mobile, and embedded systems.

When was Avalonia released?

Avalonia’s first commit was made on 11 December 2013, and it has been in continuous development ever since. Starting in 2025, Avalonia is aligning its release cycle with .NET, major versions will ship in Q4 each year, with quarterly point releases in between. This approach keeps upgrades predictable, smaller in scope, and easier to adopt.

What language does Avalonia use?

Avalonia applications can be written in any .NET language, including C#, F#, and VB.NET. The framework itself is primarily developed in C#, with small portions in lower-level languages such as Objective-C++ for platform-specific interop on macOS. Developers benefit from full .NET tooling, async/await support, and seamless integration with modern .NET ecosystems.

Avalonia UI is the company behind the open-source Avalonia framework. Founded to support and scale the project commercially, Avalonia UI provides core development, long-term support, commercial tooling, and enterprise services. While the framework is fully open source, Avalonia UI ensures its ongoing development is sustainable and aligned with the needs of professional teams building cross-platform .NET applications.

What’s the difference between Avalonia and .NET MAUI?

The biggest difference is how UI is rendered. Avalonia draws every pixel using its own GPU-accelerated renderer, giving full control over appearance and behaviour across platforms. .NET MAUI, by contrast, wraps native controls, which can lead to inconsistent UI, behavioural quirks, and platform-specific bugs. Avalonia also supports Linux and Web, while MAUI is mostly focused on mobile.

Is Avalonia better than WPF?

Avalonia is often seen as the spiritual successor to WPF, modern, cross-platform, and actively developed. It retains the familiar XAML and MVVM patterns but brings GPU-accelerated rendering, styling flexibility, and support for Windows, macOS, Linux, mobile, and Web. If you’re building for multiple platforms, Avalonia is the clear choice. If you’re targeting only Windows and your app relies heavily on legacy WPF features or third-party components, WPF may still be sufficient.

Is Avalonia cross platform?

Yes. Avalonia is a fully cross-platform UI framework. It supports building applications for Windows, macOS, Linux (including Ubuntu, Fedora, and Arch), iOS, Android, Web (via WebAssembly), and embedded systems such as Raspberry Pi. All platforms can be targeted from a single .NET codebase, with consistent appearance and behaviour.

Yes. Avalonia is free and open-source, licensed under MIT. You can build and ship commercial applications without paying anything. Avalonia UI, the company behind the framework, offers optional paid services and tools for teams that need advanced support or productivity features, but the core framework is fully functional and suitable for complex apps without any cost.

Does Avalonia support mobile and web?

Yes. Avalonia supports both mobile and web platforms. You can build native iOS and Android apps using the same XAML and .NET codebase. For the web, Avalonia compiles to WebAssembly, allowing your app to run directly in the browser without plugins. Both mobile and web support are actively developed and suitable for production use in many scenarios.

Can I use Avalonia in commercial applications?

Yes. Avalonia can be used freely in commercial applications under the permissive MIT licence. There are no royalties, licensing fees, or usage restrictions. Many companies use Avalonia to build proprietary software, internal tools, and commercial products. Avalonia UI also offers optional support and commercial add-ons for teams that need enterprise-grade capabilities.

How stable is Avalonia?

Avalonia is stable and production-ready. It has over a decade of development behind it, a growing ecosystem, and is used by major organisations across industries including finance, aerospace, healthcare, and developer tooling. The framework follows a predictable release cycle, with each version undergoing extensive testing across all supported platforms. Teams building mission-critical software rely on Avalonia in production every day.

Is Avalonia production ready?

Yes. Avalonia is production ready and actively used in commercial software across desktop, mobile, embedded, and web. Companies like GitHub, JetBrains, Siemens, and NASA trust it for real-world applications. It offers strong platform coverage, predictable releases, and professional support options for teams that need them.

How does Avalonia compare to Uno Platform?

Uno Platform is a reimplementation of WinUI, a UI framework from Microsoft that has failed to gain widespread industry adoption. As a result, Uno inherits the complexity, API surface, and limitations of WinUI, a platform many developers actively avoid. Avalonia, by contrast, was built from the ground up to be cross-platform, performant, and developer-friendly, without being shackled to legacy Windows specific design decisions. The result is a more modern developer experience and a significantly larger, growing community.

Run your unmodified WPF apps on macOS and Linux with Avalonia XPF.

Build apps for every device using .NET

Build apps for every
device using .NET

Harness the power of cross-platform .NET
One codebase. Infinite possibilities

One codebase.
Infinite possibilities.

You're in good company

The open-source WPF successor for .NET developers
building beautiful, cross-platform applications.

The open-source WPF successor for .NET developers building beautiful, cross-platform applications.

Open Source

Avalonia is FOSS and always will be.

Clone the source code and contribute to the community.

Open Source

Avalonia is FOSS and always will be.

Clone the source code and contribute to the community.

Open Source

Avalonia is FOSS and always will be.

Clone the source code and contribute to the community.

Enhanced Support

Get assistance directly from the creators of Avalonia when you need it.

Enhanced Support

Get assistance directly from the creators of Avalonia when you need it.

Enhanced Support

Get assistance directly from the creators of Avalonia when you need it.

Growing Community

Join hundreds of thousands of developers developing with Avalonia.

Growing Community

Join hundreds of thousands of developers developing with Avalonia.

Growing Community

Join hundreds of thousands of developers developing with Avalonia.

Performance Focused

Avalonia delivers smooth, responsive apps even on even the lowest-powered devices.

High performance isn’t optional; it comes as standard.

Performance Focused

Avalonia delivers smooth, responsive apps even on even the lowest-powered devices.

High performance isn’t optional; it comes as standard.

Performance Focused

Avalonia delivers smooth, responsive apps even on even the lowest-powered devices.

High performance isn’t optional; it comes as standard.

Cross-Platform by Design

Easily target Windows, macOS, Linux, iOS, Android, and WebAssembly, all from a single, unified .NET codebase.

Write your app once, deploy everywhere, and enjoy consistency.

Cross-Platform by Design

Easily target Windows, macOS, Linux, iOS, Android, and WebAssembly, all from a single, unified .NET codebase.

Write your app once, deploy everywhere, and enjoy consistency.

Cross-Platform by Design

Easily target Windows, macOS, Linux, iOS, Android, and WebAssembly, all from a single, unified .NET codebase.

Write your app once, deploy everywhere, and enjoy consistency.

Forward Looking

Avalonia is designed for the long haul, combining proven stability with a clear vision for the future.

With over a decade behind us, stability isn’t just a feature, it’s our core business.

Forward Looking

Avalonia is designed for the long haul, combining proven stability with a clear vision for the future.

With over a decade behind us, stability isn’t just a feature, it’s our core business.

Forward Looking

Avalonia is designed for the long haul, combining proven stability with a clear vision for the future.

With over a decade behind us, stability isn’t just a feature, it’s our core business.

Ship pixel-perfect Windows, macOS, and Linux apps from one XAML codebase

Avalonia is a mature WPF alternative. Avalonia provides a familiar developer experience, allowing you to create rich, highly performant desktop applications for Windows, macOS and Linux, all from a single codebase.

The spiritual successor to WPF, Avalonia provides a familiar developer experience, allowing you to create rich, highly performant applications for Windows, macOS and Linux, all from a single codebase.

.NET embedded Linux GUI toolkit for industrial devices

With both FBDev and DRM support, you can deliver high-quality user experiences on an array of embedded devices running barebone Linux.

Perfect for deploying your apps to low-powered devices.

With both FBDev and DRM support, you can deliver high-quality user experiences on an array of embedded devices running barebone Linux.

Perfect for deploying your apps to low-powered devices.

Avalonia solitaire sample app in a web browser.

.NET WebAssembly UI: run your app directly in the browser

.NET WebAssembly UI:
Run your app directly in the browser

Avalonia lets you run your existing applications directly in the browser, powered by WebAssembly.

No need for extensive rewrites or additional front-end technologies, simply deploy your application online, preserving performance and ensuring a consistent experience for every user, everywhere.

Avalonia lets you run your existing applications directly in the browser, powered by WebAssembly.

No need for extensive rewrites or additional front-end technologies, simply deploy your application online, preserving performance and ensuring a consistent experience for every user, everywhere.

Consistent UI on every device: your mature MAUI alternative

Consistent UI on every device:
Your mature MAUI alternative

Avalonia lets you create mobile applications from a single codebase, delivering exceptional visuals and native performance on both iOS and Android devices.

With our Hybrid MAUI integration, you can include any .NET MAUI UI control within your Avalonia app, combining the power of Avalonia’s flexible UI framework with the extensive control ecosystem from MAUI.

Save time, reduce complexity, and deliver a consistent, pixel-perfect experience on every device.

Avalonia lets you create mobile applications from a single codebase, delivering exceptional visuals and native performance on both iOS and Android devices.

Save time, reduce complexity, and deliver a consistent, pixel-perfect experience on every device.

Avalonia lets you create mobile applications from a single codebase, delivering exceptional visuals and native performance on both iOS and Android devices.

Save time, reduce complexity, and deliver a consistent, pixel-perfect experience on every device.

Avalonia vs MAUI

.NET IDE support: Visual Studio, Rider, VS Code

The Avalonia Extension for Visual Studio 2022 provides XAML IntelliSense and a built-in XAML previewer, making developing cross-platform apps in Visual Studio a breeze.

As users of Avalonia, JetBrains products natively understand Avalonia XAML, offering code completion and advanced refactoring support. Combined with the Avalonia Previewer extension, Rider is a powerhouse for cross-platform developers.

Choose C#, F# or XAML for your User Interface

Most developers prefer our modern flavour of XAML to craft clean, maintainable user interfaces, but Avalonia gives you complete freedom.

Our powerful XAML compiler generates efficient IL code, identical to what you’d get writing directly in C#, F#, or any other .NET language.

So whether you prefer declarative XAML or the expressiveness of your favourite programming language, Avalonia adapts seamlessly to your workflow.

Most developers prefer our modern flavour of XAML to craft clean, maintainable user interfaces, but Avalonia gives you complete freedom.

Our powerful XAML compiler generates efficient IL code, identical to what you’d get writing directly in C#, F#, or any other .NET language.

So whether you prefer declarative XAML or the expressiveness of your favourite programming language, Avalonia adapts seamlessly to your workflow.

Most developers prefer our modern flavour of XAML to craft clean, maintainable user interfaces, but Avalonia gives you complete freedom.

Our powerful XAML compiler generates efficient IL code, identical to what you’d get writing directly in C#, F#, or any other .NET language.

So whether you prefer declarative XAML or the expressiveness of your favourite programming language, Avalonia adapts seamlessly to your workflow.

Migrate legacy WPF apps to macOS and Linux in minutes with XPF

Take your WPF applications to new platforms effortlessly with Avalonia XPF. With minimal to no changes, you can achieve cross-platform functionality in minutes, not months, expanding your reach with ease

Bring your favourite WPF pro controls to macOS and Linux with support for renowned vendors, including Telerik, Actipro, DevExpress, Infragistics, Syncfusion, and SciChart

Learn More

Bill Henning

Actipro Software

Avalonia has a very strong community, offers pixel-perfect rendering on a multitude of platforms, is easy to customize, and frankly is a joy to work with.

Bill Henning

Actipro Software

Avalonia has a very strong community, offers pixel-perfect rendering on a multitude of platforms, is easy to customize, and frankly is a joy to work with.

Bill Henning

Actipro Software

Avalonia has a very strong community, offers pixel-perfect rendering on a multitude of platforms, is easy to customize, and frankly is a joy to work with.

Stefan Koell

Royalapps

Working with Avalonia is a breath of fresh air and certainly superior to all the (failed) frameworks from Microsoft to make high-performance, cross-platform apps.

Stefan Koell

Royalapps

Working with Avalonia is a breath of fresh air and certainly superior to all the (failed) frameworks from Microsoft to make high-performance, cross-platform apps.

Stefan Koell

Royalapps

Working with Avalonia is a breath of fresh air and certainly superior to all the (failed) frameworks from Microsoft to make high-performance, cross-platform apps.

Daniel Pañalba

Unity Games

Avalonia's support team is fantastic. They respond quickly and provide clear, effective solutions, making development much easier.

Daniel Pañalba

Unity Games

Avalonia's support team is fantastic. They respond quickly and provide clear, effective solutions, making development much easier.

Daniel Pañalba

Unity Games

Avalonia's support team is fantastic. They respond quickly and provide clear, effective solutions, making development much easier.

Fabian Huegle

Stryker

Avalonia rebuilds lives by simplifying our journey from Windows to Linux, macOS and mobile based medical device software.

Fabian Huegle

Stryker

Avalonia rebuilds lives by simplifying our journey from Windows to Linux, macOS and mobile based medical device software.

Fabian Huegle

Stryker

Avalonia rebuilds lives by simplifying our journey from Windows to Linux, macOS and mobile based medical device software.

Most-starred .NET UI on GitHub

Avalonia's popularity is soaring, and with it, our community is flourishing. Join us and become part of a dynamic, supportive network of developers.

Contributors

Stargazers

Installs

Loved by developers.
Trusted by enterprise.

Get Started

Build apps for every device using .NET

Build apps for every device using .NET

Harness the power of cross-platform .NETOne codebase. Infinite possibilities

One codebase. Infinite possibilities.

You're in good company

The open-source WPF successor for .NET developers building beautiful, cross-platform applications.

The open-source WPF successor for .NET developers building beautiful, cross-platform applications.

Open Source

Open Source

Open Source

Enhanced Support

Enhanced Support

Enhanced Support

Growing Community

Growing Community

Growing Community

Performance Focused

Performance Focused

Performance Focused

Cross-Platform by Design

Cross-Platform by Design

Cross-Platform by Design

Forward Looking

Forward Looking

Forward Looking

Ship pixel-perfect Windows, macOS, and Linux apps from one XAML codebase

.NET embedded Linux GUI toolkit for industrial devices

.NET embedded Linux GUI toolkit for industrial devices

.NET embedded Linux GUI toolkit for industrial devices

.NET WebAssembly UI: run your app directly in the browser

.NET WebAssembly UI: run your app directly in the browser

.NET WebAssembly UI: Run your app directly in the browser

Consistent UI on every device: your mature MAUI alternative

Consistent UI on every device: your mature MAUI alternative

Consistent UI on every device: Your mature MAUI alternative

.NET IDE support: Visual Studio, Rider, VS Code

.NET IDE support: Visual Studio, Rider, VS Code

.NET IDE support: Visual Studio, Rider, VS Code

Choose C#, F# or XAML for your User Interface

Choose C#, F# or XAML for your User Interface

Choose C#, F# or XAML for your User Interface

Migrate legacy WPF apps to macOS and Linux in minutes with XPF

Bill Henning

Bill Henning

Bill Henning

Stefan Koell

Stefan Koell

Stefan Koell

Daniel Pañalba

Daniel Pañalba

Daniel Pañalba

Fabian Huegle

Fabian Huegle

Fabian Huegle

Most-starred .NET UI on GitHub

Contributors

Contributors

Stargazers

Stargazers

Installs

Installs

Loved by developers. Trusted by enterprise.

Build apps for every
device using .NET

Harness the power of cross-platform .NET
One codebase. Infinite possibilities

One codebase.
Infinite possibilities.

The open-source WPF successor for .NET developers
building beautiful, cross-platform applications.

.NET WebAssembly UI:
Run your app directly in the browser

Consistent UI on every device:
Your mature MAUI alternative

Loved by developers.
Trusted by enterprise.