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SPECIFICTION
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Seelen UI

seelen.io

Free plan Windows
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Spec score 7.5 #22 of 39 in Start Menu Customization Software

What it is

Seelen UI is a free customization layer for organizing windows and changing the Windows desktop interface. It is designed for Windows 10 and Windows 11 and does not modify system files or fully replace the desktop. Its automatic tiling manager offers BSPWM, Tall, Wide, and Grid layouts, plus float, stack, monocle, and per-app rules. The shell includes a dock, scriptable toolbar, start menu, custom Alt+Tab switcher, and window previews. Background options include MP4 and WebM video, interactive HTML/CSS/JS, music-synced visuals, and collections assigned to monitors or workspaces. Built-in widgets include media controls, clock and calendar, system monitoring, notifications, Wi-Fi, and Bluetooth. The media module supports pausing, resuming, and skipping tracks with most music players. Documentation covers themes, widgets, plugins, and development; community support is directed through Discord, repositories, and other channels. Modified, debloated, or custom Windows installations are not recommended because removed components or disabled services may cause errors.

Spec sheet

Purpose
Seelen UI is a customizable Windows desktop environment for organizing windows, customizing the interface, and optimizing workflow.Read 1 Oct 2026 · seelen.io
Community support
Seelen directs users to its Discord community, repositories, and channels for support and shared solutions.Read 1 Oct 2026 · seelen.io
Desktop shell
Seelen UI provides a dock, scriptable toolbar, start menu, custom Alt+Tab switcher, and window previews.Read 1 Oct 2026 · seelen.io
Extensibility
The official documentation covers themes, widgets, plugins, resource guidelines, and a developer reference for building on Seelen UI.Read 1 Oct 2026 · seelen.io
Known limitation
Modified, debloated, or custom Windows versions are not recommended because disabled services or removed components can cause errors or malfunction.Read 1 Oct 2026 · seelen.io
Live wallpapers
It supports MP4 and WebM video wallpapers, interactive HTML/CSS/JS wallpapers, music-synced backgrounds, and per-monitor or per-workspace collections.Read 1 Oct 2026 · seelen.io
Media integration
Its integrated media module is compatible with most music players and supports pause, resume, and track skipping.Read 1 Oct 2026 · seelen.io
Open source
Seelen says 80% of its software is open-source and that its tools are generally modular and open-source.Read 1 Oct 2026 · seelen.io
Privacy commitment
Seelen says it does not sell user data, does not use dark patterns, and designs privacy into its products.Read 1 Oct 2026 · seelen.io
System changes
Seelen UI does not modify Windows system files and adds a customization layer instead of fully replacing the Windows desktop.Read 1 Oct 2026 · seelen.io
Target users
Seelen says its solutions are built for artists, designers, professionals, and curious users.Read 1 Oct 2026 · seelen.io
Widgets
Built-in widgets include media controls, a clock and calendar, CPU/RAM/network/disk monitoring, notifications, Wi-Fi, and Bluetooth.Read 1 Oct 2026 · seelen.io
Window manager
The automatic tiling window manager provides BSPWM, Tall, Wide, and Grid layouts plus float, stack, monocle, and per-app rules.Read 1 Oct 2026 · seelen.io
Windows compatibility
Seelen UI is designed for Windows 10 and Windows 11.Read 1 Oct 2026 · seelen.io

Plans and prices

Free Free complete desktop customization suite Read 1 Oct 2026 · seelen.io

Every Seelen UI plan and price →

Strong points and limits

Strong points

  • Free complete desktop customization suite.
  • Provides four automatic tiling layouts and per-app rules.
  • Supports video and interactive wallpapers.
  • Includes system, connectivity, and media widgets.
  • Does not modify Windows system files.

Limits

  • Designed for Windows 10 and Windows 11 only.
  • Modified or debloated Windows versions may malfunction.
  • Integrated media controls work with most, not all, music players.

Who it suits

Seelen UI suits Windows users who want to customize window layouts, desktop elements, and wallpapers. Its documented themes, widgets, plugins, and developer reference may also suit people who want to extend the environment.

Verdict

Seelen UI offers extensive window and interface controls as a Windows customization layer rather than a desktop replacement. Avoid modified Windows installations, which the maker says can cause errors or malfunction.

Where Specifiction places it

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