head to head · open source
Avalonia vs Harper
Avalonia has 31,747 GitHub stars, 2,877 forks, 1,875 open issues and last shipped yesterday. Harper has 17,365 stars, 794 forks, 896 open issues and last shipped yesterday. Avalonia leads on adoption by 83% (31,747 vs 17,365 stars). Avalonia is written in C# under MIT; Harper is written in Rust under Apache-2.0. Avalonia has attracted 9% as many forks as stars, Harper 5%. Harper was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Avalonia | Harper | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 17K |
| License | MIT | Apache-2.0 |
| Written in | C# | Rust |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 2.9K | ⑂ 794 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Avalonia if
- You weight community size — 32K stars and counting
- You want the MIT license terms
- Your stack matches C#
- You value the larger contributor base for long-term maintenance
pick Harper if
- You want the Harper feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and Harper fits your workflow better
About Avalonia
📖 About Avalonia is a cross platform UI framework for dotnet, providing a flexible styling system and supporting a wide range of platforms such as Windows, macOS, Linux, iOS, Android and WebAssembly. Avalonia is mature and production ready and is used by companies, including Schneider Electric, Unity, JetBrains and GitHub. Considered by many to be the spiritual successor to WPF, Avalonia UI provides a familiar, modern development experience for XAML developers creating cross platform applications. While Avalonia UI is similar to WPF, it isn't a 1:1 copy, and you'll find plenty of improvements. For those seeking…
read the full Avalonia overview →
About Harper
Harper Harper is an English grammar checker designed to be just right. I created it after years of dealing with the shortcomings of the competition. Grammarly was too expensive and too overbearing. Its suggestions lacked context, and were often just plain wrong . Not to mention: it's a privacy nightmare. Everything you write with Grammarly is sent to their servers. Their privacy policy claims they don't sell the data, but that doesn't mean they don't use it to train large language models and god knows what else. Not only that, but the round trip time of the network request makes revising your work all the more…
read the full Harper overview →
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Frequently asked questions
Is Avalonia or Harper more popular?
Avalonia has 31,747 GitHub stars and Harper has 17,365. Avalonia has the larger community by that measure.
Are Avalonia and Harper free?
Both are open source. Avalonia is licensed under MIT and Harper under Apache-2.0. Neither carries a licence fee.
What is the difference between Avalonia and Harper?
Avalonia is written in C# and Harper in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Avalonia or Harper?
Choose Avalonia if you want the larger community (31,747 stars) or its MIT licence terms. Choose Harper if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.