The program is an add-on for the official android app of the Hungarian Reformed Evangelical Alliance (MRE) called Magyar Református Énekeskönyv. It is intended for the use of the Christian community, especially the Catholic Church. It provides access to songs in the Hungarian Reformed songbooks, but it does not include songs that are only 512 singers. The program is a combination of a hymnbook and a music player. It can be used on mobile devices. It does not require an internet connection, nor does it have any advertisements. The songs are arranged in a list. You can add your favorite songs, or mark them as a favorite so that they are easier to find. The top row of icons from right to left: settings, book, always alert status, favorites send/remove, favorites edit. content: currently selected song book contents.