Freedom251 › Start Menu Customization Software

Seelen UI

Free plan Windows

What Seelen UI is

Seelen UI is a free customization layer for Windows 10 and Windows 11 that helps organize windows and adjust the desktop environment. Its automatic tiling manager offers BSPWM, Tall, Wide, and Grid layouts, along with floating, stacked, monocle, and per-app rules. The desktop shell includes a dock, scriptable toolbar, start menu, custom Alt+Tab switcher, and window previews. Background options include MP4 and WebM videos, interactive HTML/CSS/JS, music-synced visuals, and collections assigned by monitor or workspace. Built-in widgets cover media controls, clock and calendar, CPU, RAM, network and disk monitoring, notifications, Wi-Fi, and Bluetooth. Its media module works with most music players for pausing, resuming, and skipping tracks. Documentation covers themes, widgets, plugins, and development, with community help through Discord, repositories, and other channels. Seelen says the app adds a customization layer rather than changing Windows system files or fully replacing the desktop. Modified, debloated, or custom Windows versions are not recommended because removed components or disabled services may cause errors.

Who it suits

It suits Windows users who want more control over window layouts, desktop elements, and backgrounds. The maker names artists, designers, professionals, and curious users as audiences for its tools.

What it does well

Free desktop customization suite.
Supports multiple tiling layouts and per-app rules.
Offers video and interactive wallpapers.
Built-in widgets monitor system and network activity.
Does not modify Windows system files.

What to know first

Designed for Windows 10 and Windows 11 only.
Modified or debloated Windows versions are not recommended.

Plans

Plan	Billed and limits	Price
Free	complete desktop customization suite	Free

As seelen.io lists them, read 1 Oct 2026. The maker's own page has the final word.

Getting started

Visit the Seelen UI website.
Use a Windows 10 or Windows 11 device.
Start with the free desktop customization suite.

Verdict

Seelen UI combines window management, desktop controls, widgets, and customizable backgrounds in one Windows layer. Users of modified Windows versions should account for the stated risk of errors or malfunction.

Questions

How much does Seelen UI cost?

The Free plan costs 0.00 USD and includes the complete desktop customization suite.

Which Windows versions does it support?

Seelen UI is designed for Windows 10 and Windows 11.

Does Seelen UI replace the Windows desktop or change system files?

It adds a customization layer and does not modify Windows system files.

Is Seelen UI open source?

Seelen says 80% of its software is open source and describes its tools as generally modular and open source.

Where can users find help and development information?

Seelen directs users to its Discord community, repositories, and channels. Its documentation covers themes, widgets, plugins, resource guidelines, and a developer reference.

Facts from Seelen UI's own pages

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

Where Seelen UI stands on Freedom251

Start Menu Customization Software#18 of 39