Holidays Calendar RF is a free Android app developed by AtomARSoft that provides a comprehensive calendar for users. It includes information about the Russian official holidays, as well as data about theand 6-daysworking week. The app displays information about each month, including the day, working day, and holiday count in the month.

One of the standout features of Holidays Calendar RF is its customizable widgets, which come in four different sizes (2x2, 3x3, 4x2, 4x4) and allow users to change the color theme of the application and widgets. The app also loads contact birthdays and displays them on the calendar, with the option to set notifications for upcoming birthdays. Additionally, users can make simple notes within the app and set notifications for each note.

Overall, Holidays Calendar RF is a useful app for anyone looking for a comprehensive calendar with customizable widgets and birthday reminders.