Hi HN, I built Debut because macOS Cmd-Tab doesn't work well with Spaces. When an app has windows on several Spaces, Cmd-Tab treats them as one app, so it's hard to get to a specific window.

Debut changes Cmd-Tab to show only the windows on the current Space. It also shows all Spaces and their windows in one view, where you can add/remove/reorder Spaces and move windows between them.

I spent a lot of time optimizing the UI and interactions so it feels like a natural evolution of the macOS app switcher. Hope you like it!