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Avalonia VS Flet

Compare Avalonia VS Flet and see what are their differences

Avalonia logo Avalonia

A multi-platform .NET UI framework

Flet logo Flet

Build internal web apps quickly in the language you already know.
  • Avalonia Landing page
    Landing page //
    2022-05-01
  • Flet Landing page
    Landing page //
    2023-08-28

Avalonia features and specs

  • Cross-Platform
    Avalonia supports Windows, macOS, and Linux, enabling developers to write a single codebase that runs on multiple platforms.
  • MVVM Support
    Avalonia has strong support for the Model-View-ViewModel (MVVM) pattern, which can help developers create maintainable and scalable applications.
  • Rich Styling System
    Avalonia provides a powerful styling system similar to CSS, giving developers the ability to easily customize the appearance of their applications.
  • Open Source
    Being open-source, Avalonia allows developers to contribute to its development, inspect the codebase, and ensure long-term viability without vendor lock-in.
  • Community Support
    Avalonia has an active and growing community, which can be beneficial for troubleshooting issues, finding resources, and sharing knowledge.
  • ReactiveUI Integration
    It integrates seamlessly with ReactiveUI, a powerful reactive programming library, for building dynamic and responsive applications.

Possible disadvantages of Avalonia

  • Maturity
    Avalonia is relatively young compared to more established frameworks like WPF or WinForms, which might result in fewer features and stability issues.
  • Smaller Ecosystem
    Given its younger age, Avalonia has a smaller ecosystem with fewer third-party libraries, tools, and components available for developers.
  • Performance
    Depending on the complexity of the application, performance may not be on par with native frameworks, especially on resource-intensive tasks.
  • Learning Curve
    Developers new to Avalonia may face a learning curve, especially if they are not familiar with its MVVM pattern and reactive programming paradigms.
  • Documentation
    Although improving, the documentation for Avalonia might not be as comprehensive or as polished as that of more mature frameworks.
  • Platform-Specific Issues
    Cross-platform development can bring platform-specific issues and inconsistencies that developers need to handle, which can increase complexity.

Flet features and specs

  • Ease of Use
    Flet provides a straightforward API that simplifies the process of building interactive web applications, making it accessible even to those with minimal web development experience.
  • Cross-Platform Support
    Flet supports multiple platforms, allowing developers to create applications that can run seamlessly across different devices and operating systems.
  • Rapid Development
    With a focus on fast development cycles, Flet enables developers to quickly prototype and deploy applications, significantly reducing time to market.
  • Rich UI Components
    Flet offers a wide range of built-in UI components that help developers create visually appealing and functional interfaces without having to start from scratch.
  • Community and Documentation
    Flet comes with comprehensive documentation and an active community, providing valuable resources and support for developers throughout the development process.

Possible disadvantages of Flet

  • Limited Customization
    While Flet offers many built-in components, the level of customization available may not satisfy developers looking for highly tailored UI experiences.
  • Dependency on Flet Ecosystem
    Developers are tied into the Flet ecosystem, which could pose challenges if they need to integrate with other tools or want to migrate away in the future.
  • Performance Concerns
    As with many high-level frameworks, there might be performance overheads, especially for resource-intensive applications.
  • Learning Curve
    Although designed for ease of use, developers familiar with other web development frameworks may need time to learn and adapt to Flet's unique features and paradigms.
  • Emerging Technology
    Being a relatively new technology, Flet might still be undergoing changes, which may lead to stability issues or lack of long-term support.

Analysis of Avalonia

Overall verdict

  • Avalonia is considered a strong choice for developers seeking a cross-platform framework with a focus on desktop applications. Its continuous improvements and feature set make it appealing for projects requiring a unified codebase across multiple operating systems.

Why this product is good

  • Avalonia is praised for its unique cross-platform capabilities, enabling developers to write applications that run on Windows, macOS, and Linux. It uses XAML, which is familiar to developers with experience in WPF or UWP, promoting a quicker learning curve. Furthermore, Avalonia boasts a modern and flexible UI framework, an active development community, and a growing set of controls and third-party integrations.

Recommended for

    Avalonia is recommended for developers who are familiar with XAML-based technologies and are looking to build cross-platform desktop applications. It's particularly well-suited for projects targeting multiple desktop environments with a single codebase, as well as for those who value a consistent UI experience across different platforms.

Avalonia videos

A Cross Platform .NET UI Framework - Hello World in Avalonia UI

More videos:

  • Review - Nikita Tsukanov - AvaloniaUI - cross-platform XAML-oriented .NET UI framework
  • Review - Avalonia XAML debugging. Where is your WPF/UWP/Xamarin.Forms now?

Flet videos

FLET Can Cooler กระป๋องน้ำจะไม่หายเย็นก่อนกินหมดอีกต่อไป - Pond Review

More videos:

  • Review - FLET Tumbler รุ่นใหม่ แก้ปัญหาของตัวเก่าได้ครบทุกจุด! - Pond Review
  • Review - Ekskluzive/ Detaje të reja nga vrasja e Shëngjinit, flet familjarja e Lekstakajve Nertila Haxhia

Category Popularity

0-100% (relative to Avalonia and Flet)
Development Tools
88 88%
12% 12
Application And Data
0 0%
100% 100
Rapid Application Development
Cross-Platform Development

User comments

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Social recommendations and mentions

Based on our record, Avalonia should be more popular than Flet. It has been mentiond 142 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Avalonia mentions (142)

  • The History and Legacy of Visual Basic
    Check out https://avaloniaui.net as well. It's basically a cross-platform reimplementation of WPF. It's not quite as simple as C#+WinForms or Lazarus+LCL because you don't get drag-and-drop UI designer, and you need to write markup by hand (albeit with live preview). But unlike HTML, it's actually designed for desktop UI apps from the get go, so it's much easier to write for anything non-trivial. And you can still... - Source: Hacker News / 26 days ago
  • Show HN: Meld RDP – A Fast, Portable Remote Desktop Manager (.rdp)
    - It's built with https://avaloniaui.net/ so it may be possible to get it working on Linux, though I have little experience there. Would love to hear any feedback, ideas, or feature suggestions! Thanks for checking it out! https://github.com/meld-cp/MeldRDP. - Source: Hacker News / 2 months ago
  • WASM Wayland Web (WWW)
    > The web had this before briefly. Back in the 90s and 00s, some people just wanted to use Flash. WebAssembly is different. WebAssembly brings every language to the web. Flash didn't. WebAssembly can render to canvas and enable applications that compile to desktop, mobile, and the web. UI libraries like Avalonia do this: https://avaloniaui.net/ For example, here's C# implementation of Visual Basic 6... - Source: Hacker News / 3 months ago
  • Servo in 2024: stats, features and donations
    That's why I mentioned https://avaloniaui.net/ which does the part. WPF is not bad compared to everything happening in the web frameworks. - Source: Hacker News / 4 months ago
  • Compiling Java into Native Binaries with Graal and Mill
    I don't know why anyone even uses the GUI frameworks from Microsoft these days. WinForms is only good if you need to throw something together quick. Everything else should be Avalonia (https://avaloniaui.net/). Cross platform and does support AOT. - Source: Hacker News / 4 months ago
View more

Flet mentions (39)

  • From Codecademy to Programming: My First Python Flet App For Managing Shopping List
    As part of my final project for the "Fundamentals of Programming" in Codecademy Computer Science course, I wanted to build something practical that could also help me reinforce my understanding of programming fundamentals. With that in mind, I created a simple but fully functional shopping list app using Flet—a Python framework for building beautiful UIs without needing to dive into web development. This app... - Source: dev.to / 28 days ago
  • Using Uv and PEP 723 for Self-Contained Python Scripts
    It's more the latter, particularly when Rust is used in libraries (eg. FastAPI) as opposed to tools, as it's destroying portability. For example I use flet[0] in some of my projects, and I have to be increasingly careful about the other dependencies as there is no support for the Rust toolchain within Dart/Flutter, and even if there was it still sounds like it'd be a nightmare to maintain. Same applies to any... - Source: Hacker News / 2 months ago
  • All Data and AI Weekly #182 - 24-March-2025
    Cool Stuff of the week ⚡️ https://flet.dev/. - Source: dev.to / 2 months ago
  • Show HN: Robyn – "Batman Inspired" Python Web Framework Built with Rust
    The problem with all this combining is that it's making apps less portable. Like I want to make apps that work on desktop+mobile with flet[0], but now I have to specifically seek out more "traditional" alternate packages and hope they stayed in reasonable feature parity with these Rustified Frankensteins. Not a fan at all. [0] https://flet.dev. - Source: Hacker News / 3 months ago
  • Building a calculator using Flet with python
    In line 7 we define the main app instance to Page; a page is a container for View Controls. So here I won’t go deep into views since it’s beyond the scope of this tutorial, but you reference here. - Source: dev.to / 9 months ago
View more

What are some alternatives?

When comparing Avalonia and Flet, you can also consider the following products

Uno Platform - Build Mobile, Desktop and WebAssembly apps with C# and XAML.

Flutter - Build beautiful native apps in record time 🚀

Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.

Kivy - Open source Python framework for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. Installation on WindowsInstallation on Windows. Installation; What are wheels .

BeeWare - Write your apps in Python and release them on iOS, Android, Windows, MacOS, Linux, Web, and tvOS...

wxWidgets - wxWidgets: Cross-Platform GUI Library