Shift Work Calendar is a free and user-friendly calendar app for shift workers or anyone who has a constantly changing schedule. The app, developed by 4th Floor Apps, is specifically designed for firefighters, nurses, linemen, deputy sheriffs, and other professionals who need to manage their work schedule and daily shifts.

The app boasts a simple and concise interface that allows you to display your work schedule with ease. It offers preset work shift patterns that you can use immediately or customize according to your needs. You can also create multiple calendars for different jobs or to track coworkers' schedules.

Shift Work Calendar is not just for work schedules. You can also input your vacations, personal events, gym schedule, and holidays. The app has a date search feature that allows you to check if you're supposed to be working on a particular day in the future or compare calendars with coworkers.

The app also comes with analytics that help you track your working hours, shifts, personal events, and money earned. You can select a period to see your income for each week, month, or year. Working goals and custom periods are currently under development.

Overall, Shift Work Calendar is a highly convenient duty roster app that is perfect for anyone who needs to manage their constantly changing schedule.