Shift Calendar is a free Android app developed by Polskie Apki that caters to the needs of emergency service workers such as firefighters, paramedics, and security guards. This utility and tool app helps workers keep track of their work schedule and work shifts.

The app is user-friendly and easy to navigate. It allows users to input their work schedule and set reminders for upcoming shifts. The app also comes with a built-in calculator that enables workers to calculate their total work hours and overtime pay.

Overall, Shift Calendar is a helpful tool for emergency service workers who need to keep track of their hectic work schedules. The app is free to download and is a great addition to any worker's toolkit. It is highly recommended for those who need to stay organized and efficient in their work life.