Shift Calendar

Shift Calendar colour-codes a full year against any shift/rest rotation, not just the classic 15/15, 30/30 or 42/14 patterns, entered as separate shift-days and rest-days. It shows the next shift at a glance, flags when a shift falls on a holiday or birthday, and works fully offline with no ads or extra permissions. Built for shift workers in oil and gas, construction, mining, security and similar rotation-based jobs. Free on Android.