Shift Calendar Alarm

Shift Calendar Alarm is an iPhone app for people on rotating shifts. Put your shifts on a calendar and the app sets the built-in iPhone alarms for the next 60 days, and keeps them in step when the roster changes. Save shift types with up to 3 alarms each, use Patterns for repeating rotations, and see today's and tomorrow's shifts in a widget.

The free version has 3 Shift Types, 1 pattern and 8 scheduled shifts. Premium removes the limits. It requires iOS 26 or later.