{
"title": "Seelen UI: The Free Shell That Gives Windows 11 True Linux-Style Tiling and macOS Docks",
"content": "Seelen UI, a free desktop environment for Windows, has recently gained attention for turning the default Windows 11 interface into a tiling, themeable workspace that rivals Linux distributions and macOS in customization. Jack Wallen, writing for ZDNET, called it “pretty cool” and admitted that even as a hard-core Linux user, he was impressed. But beyond the aesthetic appeal, Seelen UI introduces a suite of power-user features—automatic window tiling, per-monitor workspaces, a keyboard-driven launcher, and a CSS-based theming engine—that make it far more than a cosmetic overlay.

Our testing, along with feedback from the Seelen UI community, shows that this is currently the most complete way to fundamentally reshape how Windows looks and behaves, without giving up Windows app compatibility or diving into a dual-boot setup.

What Seelen UI Actually Replaces on Your Desktop

When you install Seelen UI, you’re not just adding a new skin to the taskbar. You’re overlaying—and in many cases, fully replacing—the primary interaction surfaces of Windows. The tool inserts a top status bar, a floating dock (like macOS or many Linux environments), custom flyouts for battery, network, and volume controls, and a separate settings manager. All of these are rendered using Microsoft’s WebView2 runtime, which means they’re built with web technologies (HTML, CSS, JavaScript) but look and feel like native components.

The feature list is substantial:

  • Dock and top bar: The classic Windows taskbar disappears, replaced by a centered dock for pinned and running apps, and a top bar for system information, workspaces, and quick settings. This instantly gives a macOS or GNOME-like layout.
  • Custom flyouts: Instead of the inconsistent Windows 10/11 pop-ups for volume or networking, Seelen provides its own cohesive panels, tightening the visual language across the desktop.
  • Themes and visual resources: Because everything is CSS-driven, users can apply dramatic theme packs—liquid-glass translucency, rounded widgets, animated wallpapers, icon packs—without low-level system hacks. These resources are easily shared and installed from within the settings manager.
  • Tiling window manager (TWM): This is the feature that most excites Linux converts. Seelen includes an automatic tiling engine that arranges open windows into non-overlapping layouts (like master-stack or columns). You can switch focus with the keyboard, swap containers, set floating exceptions, and even persist per-monitor workspace layouts across restarts—a feature that was added in recent updates.
  • Workspaces that stick: Virtual desktops are presented visually, and you can pin them to specific monitors. Unlike the basic Windows 11 virtual desktop implementation, Seelen’s workspaces remember your window arrangements and tiling setups between reboots.
  • App launcher (Rofi-inspired): A fast, keyboard-driven launcher lets you find and open apps, run commands, or switch tasks without touching the mouse. It’s reminiscent of the popular Rofi launcher on Linux.
  • Integrated media controls: A module provides play, pause, and skip buttons for media players directly in the UI, eliminating the need to dig into the system tray.
The key difference between Seelen UI and a collection of individual tweaks (like a Start menu replacer, a dock app, and a separate tiling script) is that all these pieces are designed to work together. The result is a coherent desktop environment that behaves predictably, not a fragile patchwork.

How This Changes Your Daily Workflow

For the typical Windows user who is mostly interested in visuals, the benefit is immediate: Seelen UI makes the desktop more pleasant to look at and use. With a few clicks, you can mimic a macOS Catalina-style glass dock, a Budgie desktop with a clean top bar, or a Windows 10.1 concept with rounded corners and transparency. The interface feels modern and visually consistent in a way that the default Windows 11 shell often doesn’t, with its mix of old Control Panel dialogs and new Settings app panes. And because it’s reversible, there’s little risk in trying it; you can always switch back to the native shell.

For power users and developers, the productivity gains are substantial. The built-in tiling window manager eliminates the need to manually resize and arrange windows—a common time sink. Keyboard-centric workflows become much easier. For example, a developer can keep Visual Studio Code in one tile, a terminal in another, and a browser in a third, all automatically arranged by the TWM. You can define hotkeys to snap windows to grid positions, switch virtual desktops, or launch apps through the Rofi-style launcher. This reduces friction for anyone who multitasks heavily, works with multiple monitors, or simply prefers not to lift their hands off the keyboard.

However, there are trade-offs. Because Seelen UI runs on WebView2, it consumes additional system resources. Community members have reported elevated RAM usage—sometimes hundreds of megabytes—when many modules are active. This is a known issue, and the developers are working on memory optimizations. On a machine with 8 GB of RAM or less, this overhead might be noticeable if you’re already pushing memory limits. Users with 16 GB or more are unlikely to feel a significant impact in day-to-day use. You can also mitigate this by disabling modules you don’t need, such as heavy glass themes or extra widgets.

The Long Road from Windows Skinning to Full Shell Overhaul

Windows customization is nothing new. Power users have been tweaking the shell since the days of Windows XP, with tools like WindowBlinds, ObjectDock, and Rainmeter. But those tools were either limited to surface-level changes (skins) or required extensive scripting to achieve a consistent look. They often broke after feature updates, and none integrated window management.

Seelen UI represents a shift in approach. By leveraging WebView2—Microsoft’s embedded browser engine that debuted with Edge and is now baked into Windows 11—developers can create rich, animated interfaces that are both easier to build and more resilient to OS updates. The CSS-based theming also opens the door for a broader community of designers who don’t need to understand Windows internals to create new looks.

The project’s rise comes at a time when many users are frustrated with Windows 11’s visual and functional limitations. The centered Start menu and rounded corners were a step toward modern design, but power users still miss the flexibility of Linux desktop environments like KDE Plasma or i3. Seelen UI fills that gap, and its availability on the Microsoft Store (as well as winget, .msix, and .exe) makes it accessible to a wide audience. Jack Wallen’s recent review on ZDNET, in which he installed it on a loaned Windows laptop and found the experience unexpectedly enjoyable, has brought mainstream attention to the tool.

Getting Started: Installation and Must-Try Configurations

Installing Seelen UI is straightforward, but we recommend a few preliminary steps to avoid headaches.

1. Prepare your system.

  • Create a system restore point. Seelen UI replaces key UI elements, and while it’s generally safe, a restore point gives you a quick way back if something goes wrong.
  • Ensure that the WebView2 runtime is installed. On Windows 11 it should already be present (it’s part of the OS), but on Windows 10 you may need to install it manually. The installer offers an option to include it; keep that checked if you’re on Windows 10.
2. Choose your install method.
  • Microsoft Store (recommended): Search for “Seelen UI” and install from the Store. This version is signed, automatically updated, and has the lowest security risk.
  • winget command line: Power users can run winget install --id Seelen.SeelenUI. This also fetches the signed MSIX package.
  • MSIX or .exe installer from GitHub: Use the .msix if you need a portable, signed package. The .exe is updated most frequently but may be unsigned, triggering SmartScreen or antivirus warnings. Avoid it unless you need bleeding-edge features and are willing to accept the risk.
3. Run the Welcome wizard. After installation, launch Seelen UI and follow the wizard to set up initial preferences. This is where you’ll enable the dock, top bar, and tiling manager.

Quick configuration recipes:

  • For a macOS-like look: In the settings manager, enable the “(Almost) Liquid Glass” dockbar theme and the “Round Toolbar” top-bar theme. Go into dock settings and enable icon magnification and center alignment. The result is a frosted, translucent aesthetic with a centered dock.
  • For a Budgie/GNOME-like Linux desktop: Apply the “Round Toolbar” theme for the top bar, “Fancy Toolbar” to customize its contents, and enable the tiling window manager. Choose a two-column layout and pin your most-used apps to the dock. This approximates the clean, modern Linux desktop experience.
  • For a tiling, keyboard-first setup: Turn on TWM, then map focus-switching and container-swapping to comfortable hotkeys (e.g., Alt+H/J/K/L to move between tiles, Ctrl+Alt+Left/Right to switch workspaces). Activate the Rofi-inspired launcher and assign it a hotkey like Ctrl+Space. You’ll rarely need to touch the mouse.
Seelen UI’s resource system allows you to stack themes and widgets, so you can mix and match: one resource for the dock visuals, another for top-bar widgets, and yet another for sound effects.

Known Risks and How to Mitigate Them

Despite its polish, Seelen UI is a community-driven project with some rough edges. Here are the most important caveats and how to deal with them:

  • WebView2 dependency: If WebView2 is missing or corrupted, Seelen may show blank screens or refuse to launch. On Windows 11 this is rare, but Windows 10 users should double-check. Reinstalling the WebView2 runtime from Microsoft’s developer site usually fixes it.
  • Memory usage: Active bug reports note that WebView2-based modules can consume significant RAM over time. If you notice sluggishness, check Task Manager. You can reduce module count or switch back to the native shell temporarily. The developers are aware and working on improvements.
  • Unsigned .exe installer: The plain .exe may be flagged by Windows Defender or SmartScreen. Stick to the Store or winget versions for machines where security is critical.
  • System integration quirks: Because Seelen hooks deeply into the shell, certain apps—especially full-screen games, some UWP apps, or privileged system dialogs—may not behave as expected. Seelen provides escape modes (floating windows for TWM, toggles to restore the native taskbar), but test your must-have applications before committing.
  • Third-party resources: The community ecosystem is vibrant, but not all themes and plugins are vetted. Treat any downloaded resource with the same caution as any third-party Windows software. Prefer resources from official channels or well-known community members, scan files with antivirus, and keep a backup.
If something breaks:
  1. Force-restart the Seelen GUI using Ctrl+Win+Alt+R (if configured) or by ending the process in Task Manager.
  2. To return to the native Windows shell, you can disable Seelen