Debut changes macOS window switching so Command-Tab focuses on the windows in the current Space, while Option-Tab can show windows across Spaces. The product organizes workspaces in a single switcher and supports jumping between Spaces using clicks or keyboard shortcuts. It is designed for people who use multiple desktops and do not want their usual switcher to mix every workspace together.
The official page also describes moving windows between Spaces and changing the switcher's appearance. Some capabilities have newer system requirements: adding or merging Spaces and selected appearance controls are marked as requiring macOS 27, while the general download is listed for Apple Silicon Macs running macOS 26 or later. Debut is free and open source under GPL-3.0, with its repository and releases linked from the site. It is a workspace-management utility, not a replacement operating system or a remote-desktop tool, and its usefulness depends on a Mac meeting the relevant feature requirements.
