Mac apps and Mac projects are different organizing axes. App groups answer “which program is this?” Project groups answer “which result is this window helping me produce?” Choose the axis that removes the ambiguity you actually encounter.
Use app groups when the app already defines the work
An app-based view is efficient when each app has one stable role. If Mail is only communication, a browser is only research, and a writing app contains one active draft, Command-Tab and App Exposé already provide a simple route. Adding project labels would create upkeep without improving identification.
The model starts to fail when one browser contains two clients, or one editor has windows for unrelated repositories. The app name is then true but insufficient.
Use project groups when work crosses app boundaries
Take two client deliveries that each need a browser window and a document. Grouping by app produces one browser pile and one document pile. Grouping by delivery produces two complete sets:
| Delivery | Windows |
|---|---|
| Client A review | feedback page, draft, asset folder |
| Client B launch | staging page, checklist, analytics note |
This does not require moving or resizing the windows. It changes the label you use to find them.
Apply a two-question test
Ask whether you can identify the right work from the app name alone. Then ask whether one outcome regularly spans more than one app. If the first answer is yes and the second is no, stay app-based. If the first is no or the second is yes, a project layer is useful.
A hybrid is often enough: keep Command-Tab for broad app switching, then use a project group only for the few active outcomes that share apps. Review the group when a delivery changes. Do not treat the group as account separation, access control, or a saved session; those are separate responsibilities.