The HKBP Almanac application is an application that contains a summary of the contents of the Protestant Batak Christian Almanac Book for every Sunday and other important HKBP (Huria Kristen Batak Protestant) days.

The purpose of making this application online is solely to make it easier for users, especially HKBP Pastors and Sintua to access the HKBP Almanac (Huria Kristen Batak Protestant) for the purposes of worship and spiritual fellowship, and to maintain the user's cellphone performance from installing large enough data .