head to head · open source
Avalonia vs LanguageTool
Avalonia has 31,517 GitHub stars, 2,826 forks, 1,875 open issues and last shipped yesterday. LanguageTool has 15,042 stars, 1,581 forks, 2,148 open issues and last shipped yesterday. Avalonia leads on adoption by 110% (31,517 vs 15,042 stars). Avalonia is written in C# under MIT; LanguageTool is written in Java under LGPL-2.1. Avalonia has attracted 9% as many forks as stars, LanguageTool 11%. Avalonia 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 | LanguageTool | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 15K |
| License | MIT | LGPL-2.1 |
| Written in | C# | Java |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.8K | ⑂ 1.6K |
| 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 LanguageTool if
- You want the LanguageTool feature set and don't need the biggest community
- You prefer the LGPL-2.1 license terms
- Your stack matches Java
- You evaluated both and LanguageTool fits your workflow better
About Avalonia
Avalonia is a cross platform UI framework for .NET, written in C and driven by XAML. It provides a flexible styling system and targets a wide range of platforms, including Windows, macOS, Linux, iOS, Android and WebAssembly. The project is mature and production ready, and it is used by companies such as Schneider Electric, Unity, JetBrains and GitHub. It lives in the .NET ecosystem and is distributed through the NuGet package manager.
read the full Avalonia overview →
About LanguageTool
LanguageTool is open source proofreading software for English, Spanish, French, German, Portuguese, Polish, Dutch, and more than 20 other languages. Its tagline describes it as an AI powered grammar checker for 30+ languages, while the repository description calls it a style and grammar checker for 25+ languages. The project lives in the natural language processing and productivity ecosystem, where it helps writers, editors, and applications detect errors that a simple spell checker cannot find.
read the full LanguageTool overview →
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Frequently asked questions
Is Avalonia or LanguageTool more popular?
Avalonia has 31,517 GitHub stars and LanguageTool has 15,042. Avalonia has the larger community by that measure.
Are Avalonia and LanguageTool free?
Both are open source. Avalonia is licensed under MIT and LanguageTool under LGPL-2.1. Neither carries a licence fee.
What is the difference between Avalonia and LanguageTool?
Avalonia is written in C# and LanguageTool in Java. 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 LanguageTool?
Choose Avalonia if you want the larger community (31,517 stars) or its MIT licence terms. Choose LanguageTool if its feature set, stack or LGPL-2.1 licence fits better. Both are self-hostable.