RDO Calendar is a free Android application developed by Pavel S that helps users keep track of their RDOs (Rostered Days Off). The app has a simple interface that allows users to easily view which days are RDOs and plan their schedules accordingly.

Upon opening the app, users are greeted with a monthly calendar that highlights RDOs in green. Users can navigate between months using the arrow buttons at the top of the screen or by swiping left or right. Additionally, users can view a list of RDOs for the year by tapping on the list icon at the top right corner of the screen.

RDO Calendar is a convenient tool for anyone who wants to stay organized and plan their time off efficiently. With its simple and user-friendly interface, this app is a must-have for anyone looking to keep track of their RDOs.