Štyri Zmeny is a free Android app developed by Miroslav Mydlo, designed to help companies manage employee shift scheduling. The app currently supports companies such as Volkswagen, Grupo Antolin, and ZVJS. It allows users to view their work schedules in a calendar format, with easy-to-understand visuals that display different shifts for various workgroups.

The app's interface is simple and user-friendly, allowing employees to view their shifts at a glance. The app provides a clear overview of the shifts, including the start and end times, making it easy for employees to plan their day. The app also supports notifications, ensuring that employees never miss a shift.