head to head · open source
Avalonia vs SingleFile
Avalonia has 31,517 GitHub stars, 2,826 forks, 1,875 open issues and last shipped yesterday. SingleFile has 22,411 stars, 1,410 forks, 101 open issues and last shipped yesterday. Avalonia leads on adoption by 41% (31,517 vs 22,411 stars). Avalonia is written in C# under MIT; SingleFile is written in JavaScript under AGPL-3.0. Avalonia has attracted 9% as many forks as stars, SingleFile 6%. 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 | SingleFile | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 22K |
| License | MIT | AGPL-3.0 |
| Written in | C# | JavaScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.8K | ⑂ 1.4K |
| 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 SingleFile if
- You want the SingleFile feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches JavaScript
- You evaluated both and SingleFile 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 SingleFile
SingleFile is a web extension, and also a command line tool, that saves a complete web page into a single HTML file. It is written in JavaScript and released under the AGPL 3.0 license, and it lives in the browser extension ecosystem, with builds published for Chrome, Firefox (desktop and mobile), Microsoft Edge, Safari, Vivaldi, Brave, Waterfox, Yandex browser, and Opera. The project has been developed for roughly sixteen years and is distributed through the extension stores of Firefox, Chrome, Safari, and Microsoft Edge, as well as through manual installation from the project archive.
read the full SingleFile overview →
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Frequently asked questions
Is Avalonia or SingleFile more popular?
Avalonia has 31,517 GitHub stars and SingleFile has 22,411. Avalonia has the larger community by that measure.
Are Avalonia and SingleFile free?
Both are open source. Avalonia is licensed under MIT and SingleFile under AGPL-3.0. Neither carries a licence fee.
What is the difference between Avalonia and SingleFile?
Avalonia is written in C# and SingleFile in JavaScript. 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 SingleFile?
Choose Avalonia if you want the larger community (31,517 stars) or its MIT licence terms. Choose SingleFile if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.