Eto.Forms review
A free, open-source C# framework for sharing desktop UI across Windows, macOS, and Linux.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Eto.Forms is a .NET user-interface framework for building desktop applications from a shared UI codebase. It is aimed at C# developers who want to target Windows, macOS, and Linux while providing native-looking interfaces through platform toolkits. The framework includes UI controls and drawing APIs, and applications can add platform-specific implementations where shared behavior is not enough. Its focus is desktop: the listed iOS and Android ports are incomplete or under development, rather than supported mobile targets.
The backend choices are a central part of Eto.Forms’ appeal. Windows support includes Windows Forms backends using GDI+ or Direct2D, as well as Windows Presentation Foundation; GTK+ 3 supports Linux, Windows, and Mac. macOS support is available through MonoMac or net6.0-macos. This gives developers options to match an application to platform toolkits, but it also means that cross-platform UI does not remove every platform-specific consideration. Teams should evaluate the backend requirements for their target systems and be prepared to maintain platform-specific code when needed.
Eto.Forms is free and open-source, with self-hosted deployment. That makes it a fit for individuals and teams across company sizes that prefer an open framework and can rely on community support and documentation. The project states that Mac apps need bundling, so macOS distribution requires that additional step. Choose Eto.Forms for shared desktop UI in a C#/.NET application; look elsewhere if mobile support is a core requirement or if you need a commercially supported framework rather than community and documentation channels.
Eto.Forms pros and cons
- Where it wins
- Share a UI codebase across Windows, macOS, and Linux.
- Offers Windows Forms, WPF, GTK+ 3, and macOS backends.
- Includes UI controls and drawing APIs; open-source and free.
- Where it doesn't
- Platform-specific implementations may be needed to extend the framework.
- Mac apps need bundling.
- iOS and Android ports are incomplete or under development.
Eto.Forms fact sheet, pricing and score →
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