Ask ten developers which framework to build a desktop app with and you'll get ten answers and at least one argument. It's a genuinely contested question, because the landscape in 2026 is rich — and the "right" answer depends entirely on your platforms, your team, and your performance needs. This is a straight, practical comparison of the frameworks that matter: WPF, WinUI 3, .NET MAUI, Avalonia, Electron, and Qt — what each is best at, where each falls short, and how to modernize an aging WPF app.
If you're earlier in the journey, our complete desktop app development guide and cross-platform overview set the scene. Here we get into the framework weeds.
WPF — The Dependable Veteran
WPF (Windows Presentation Foundation) has powered serious Windows software for well over a decade, and it isn't going anywhere. Its strengths are maturity and ecosystem: a vast library of controls, deep documentation, and a huge pool of developers who know it. It's Windows-only and its design language shows its age, but for a data-dense line-of-business Windows application, WPF remains a rock-solid, fully supported choice — and the enormous base of existing WPF apps keeps modernization (not replacement) a live and sensible option.
WinUI 3 — Modern Native Windows
WinUI 3 is Microsoft's modern native UI framework for Windows, delivering the current Fluent Design look and the deepest, most up-to-date Windows integration available. If you're building Windows-only and want your app to look and feel unmistakably contemporary — and to access the newest platform APIs — WinUI 3 is the forward-looking native pick. The trade-off is that it's Windows-only and its ecosystem is younger than WPF's, so some third-party pieces are still catching up.
Avalonia — WPF's Cross-Platform Successor in Spirit
Avalonia is a modern, open-source .NET framework heavily inspired by WPF, and it's become the standout choice for teams that want cross-platform reach without leaving the .NET/XAML world. It runs on Windows, macOS, and Linux with genuinely first-class Linux support — not an afterthought — strong desktop performance, and an API familiar to anyone with WPF experience. For a WPF team that now needs Mac and Linux, Avalonia is frequently the most natural and lowest-friction path forward.
.NET MAUI — Mobile-First, Desktop-Capable
.NET MAUI is Microsoft's cross-platform framework spanning desktop and mobile from one codebase. It shines when you genuinely need iOS and Android alongside Windows and Mac — one team, one codebase, four platforms. For desktop-only projects, though, it's often not the sharpest tool: the desktop experience and Linux story trail Avalonia's, and a WPF-to-MAUI migration carries a meaningful XAML rewrite cost. Choose MAUI when mobile is part of the plan.
"There's no 'best' desktop framework — only the best fit for your platforms, your team's skills, and your performance budget. Anyone who names a universal winner isn't listening to your requirements."
— ESS ENN Associates Desktop Engineering Team
Electron — Web Skills, Every Platform
Electron lets teams build desktop apps with web technologies — HTML, CSS, and JavaScript — running the same rich, consistent UI across Windows, macOS, and Linux. It's a superb fit when your talent is web-native and you want to move fast, which is why so many well-known apps use it. The trade-off is well known: each app bundles a browser engine, so memory use and app size are higher, and it can feel a touch less native. For many products that's a fine price for the speed and consistency.
Qt — High-Performance Heavyweight
Qt is a mature C++ framework built for performance and breadth, with an enormous widget set and a long track record in demanding domains — industrial, embedded, scientific, and resource-constrained applications. When raw performance and fine control matter more than development speed, and your team has C++ strength, Qt is a serious contender that the .NET and web frameworks can't match on efficiency.
Modernizing an Aging WPF App
A very common 2026 question isn't "what do I build new with?" but "what do I do with my old WPF app?" There are three sensible paths. Upgrade in place — move it to the latest .NET for support, security, and performance while staying on WPF. Refresh the UI — modernize the look while keeping the proven WPF foundation. Or migrate — move to Avalonia if you now need cross-platform and Linux, or WinUI 3 for a modern Windows-native future. The right route depends on whether your real need is longevity, a modern look, or new platform reach. This is exactly the kind of assessment our legacy modernization team does before recommending anything.
A Quick Decision Cheat-Sheet
- Windows-only, modern look → WinUI 3
- Windows-only, mature & data-heavy → WPF
- Cross-platform .NET, desktop-first, needs Linux → Avalonia
- Cross-platform including mobile → .NET MAUI
- Web-skilled team, cross-platform, fast delivery → Electron
- Maximum performance, C++ team → Qt