head to head · open source
Avalonia vs BrowserOS
Avalonia has 31,530 GitHub stars, 2,825 forks, 1,875 open issues and last shipped 3 days ago. BrowserOS has 13,718 stars, 1,459 forks, 82 open issues and last shipped 3 days ago. Avalonia leads on adoption by 130% (31,530 vs 13,718 stars). Avalonia is written in C# under MIT; BrowserOS is written in TypeScript under AGPL-3.0. Avalonia has attracted 9% as many forks as stars, BrowserOS 11%. Avalonia was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (browser), so they are genuine substitutes rather than adjacent tools.
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 | BrowserOS | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 14K |
| License | MIT | AGPL-3.0 |
| Written in | C# | TypeScript |
| Last push | 2026-09-18 | 2026-09-18 |
| Forks | ⑂ 2.8K | ⑂ 1.5K |
| 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 BrowserOS if
- You want the BrowserOS feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and BrowserOS 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 BrowserOS
BrowserOS is an open source agentic browser, written in TypeScript under AGPL 3.0, that puts AI agents inside a real Chromium browser on the user's own machine so they can work with real logged in accounts, and it is aimed at people who already use an agent harness such as Claude Code, Codex, Cursor, or any MCP agent and want that agent to handle web tasks instead of a sandbox.
read the full BrowserOS overview →
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Frequently asked questions
Is Avalonia or BrowserOS more popular?
Avalonia has 31,530 GitHub stars and BrowserOS has 13,718. Avalonia has the larger community by that measure.
Are Avalonia and BrowserOS free?
Both are open source. Avalonia is licensed under MIT and BrowserOS under AGPL-3.0. Neither carries a licence fee.
What is the difference between Avalonia and BrowserOS?
Avalonia is written in C# and BrowserOS in TypeScript. 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 BrowserOS?
Choose Avalonia if you want the larger community (31,530 stars) or its MIT licence terms. Choose BrowserOS if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.