PhoenixPE builds a customizable Windows 10 or 11 rescue and recovery environment that can boot from USB or a network.
Seelen UI
Seelen UI provides a customizable desktop environment for Windows 10 and 11, according to its repository description.
About Seelen UI
Seelen UI is a desktop environment replacement for Windows 10 and 11. It replaces elements including the taskbar, dock, Start menu, app launcher, window manager, system flyouts and virtual desktops, with settings for themes, layouts, keybindings and per-app behavior.
It provides a CSS/JSON-based theming engine, automatic tiling layouts, desktop widgets, a keyboard-driven launcher with fuzzy search, and workspaces with per-workspace wallpapers. The repository notes availability in 70+ languages.
Key features
- Themeable widget-powered toolbar replacing Windows taskbar
- Automatic tiling layouts including BSP, columns and stacks
- Keyboard-driven launcher with fuzzy search for apps and files
- Desktop widgets rendered on the wallpaper layer
- Custom virtual desktops with per-workspace wallpapers
- CSS/JSON theming for colors, fonts, borders and animations
Best for: Windows 10 and 11 users who want to replace the default shell with a customizable setup.
Good for
- Covers taskbar, dock, launcher, window manager and virtual desktops in one tool
- Supports CSS/JSON theming and community themes
- Available in 70+ languages
Watch out for
- Only for Windows 10 and 11
Seelen UI at a glance
- Category
- Software & Utilities › System Utilities
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Seelen UI FAQ
What is Seelen UI?
A desktop environment replacement for Windows, not a theme pack or skin, that replaces the taskbar, dock, launcher, window manager, flyouts and virtual desktops.
Which Windows versions does it support?
Windows 10 and 11.
How are themes and widgets extended?
Through a CSS/JSON-based theming engine and a plugin widget system, with support for community themes.
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