Fluent UI
Fluent UI is a free, open-source desktop app for Windows. Microsoft's WinUI3 in Flutter. It has 3,473 GitHub stars and is released under the BSD-3-Clause license. Its source code is on GitHub at bdlukaa/fluent_ui.
github.com/bdlukaa/fluent_ui (opens in a new tab)
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About Fluent UI
Design beautiful native Windows apps using Flutter Unofficial implementation of Windows UI for Flutter. It's written based on the official documentation.
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Is Fluent UI free and open source?
Yes. Fluent UI's source code is public on GitHub under the BSD-3-Clause license, which is OSI-approved or FSF-free, so you can use, copy and change it for free.
How do I install Fluent UI?
Download the installer for Windows from its GitHub Releases page (latest: v4.16.1) or the project website.
Is Fluent UI still maintained?
The repository's most recent commit was on Oct 21, 2026. appsgit only lists apps whose repository had a commit in the last six months.