Katolički KalendarMolitvenik is a free Android app developed by VITK, falling under the category of Education & Reference and subcategory Books. Initially designed as a name-day calendar with the option to add reminders, the app has grown to become much more than that. It now offers a wide range of features that would be useful to any practical Catholic.

The app's main features include a Catholic calendar with daily readings, a prayer book with over 180 prayers, a list of favorite prayers, an online Bible, and an online breviary. Additionally, the app offers a search function for both the calendar and prayer book, the ability to add reminders to your phone's calendar, and the option to share the calendar or individual prayers. The app also provides links to the biographies of saints, a list of holidays in Croatia for many years in advance, and the ability to personalize the app's appearance with background music and the option to add a picture of a saint to the home screen using one of the four available widgets.

Overall, Katolički KalendarMolitvenik is a comprehensive app that provides useful information and features for practical Catholics.