Seelen UI is a web-based application designed to enhance the Windows 11 desktop environment by replacing the taskbar and window manager with a customizable interface. It features a floating taskbar that displays open applications and provides access to pinned apps and media controls, along with a menu bar for quick access to settings. Users can customize the toolbar layout, dock positioning, and background themes, although theme options are currently limited. The application requires Microsoft Edge and WebView 2 to operate. However, it has a steep learning curve due to a lack of comprehensive guidance, and its organization can be confusing. Future improvements are anticipated, including custom widgets and multitasking features.