Shift Calendar & Alarm is a calendar built for people whose days off change every week. Instead of a fixed monthly grid, you start from a blank calendar and add only your shifts - the calendar builds itself around your actual schedule. Every shift can have its own alarm, including cross-midnight shifts (22:00-06:00). Alarms ring even when the app is closed. Public holidays for 10 countries, payday highlighting, and anniversaries are all built in. Free, offline, no account required.