About this project

Seelen UI is a complete desktop environment replacement for Windows 10 and 11 — not a theme pack or skin, but a full reimplementation of the desktop shell. It replaces and extends core Windows interface elements including the taskbar, dock, app launcher, window manager, notification flyouts, and virtual desktops. Key features include: - **Tiling Window Manager**: Automatically arranges open applications into efficient layouts (BSP, columns, stacks) with configurable gaps and padding. Supports per-app layout rules, floating mode, and keyboard-driven navigation. - **Theming Engine**: A CSS/JSON-based theming system allows styling every shell element — colors, fonts, borders, animations. Supports community themes, per-widget theming, and dark/light mode variants. - **Dynamic Accent Color**: Analyzes the current wallpaper in real time and automatically derives a harmonious accent color across all shell elements. - **Desktop Widgets**: Interactive widgets (clocks, system monitors, media controls, weather panels) rendered directly on the desktop layer, fully theme-aware. - **App Launcher**: A keyboard-driven launcher with fuzzy search for apps, files, shell commands, and custom scripts. - **Custom Shell Components**: Themeable toolbar replacing the Windows taskbar, a macOS-style application dock, custom volume/brightness/system flyouts, and a Start menu replacement. - **Workspaces**: Full virtual desktop implementation with animated transitions, per-workspace wallpapers, named workspaces with custom icons, workspace rules for pinning apps, and a visual workspaces overview panel. - **Productivity Features**: Keyboard-first design, universal media controls compatible with all major players, multi-monitor support with independent configurations per display, and localization in 70+ languages. - **Developer Features**: A Widget SDK for building custom widgets using Svelte, TypeScript, and full IPC access to system state. All configuration is stored in plain files, making it version-control and sync friendly. Installation is available through the Microsoft Store, Winget, or GitHub Releases (.msix/.exe), with all packages being signed. The application requires the WebView runtime and Microsoft Edge to function correctly. The project is open source and welcomes community contributions.