The Druk Zakar App is a comprehensive astrological tool designed for Android users, offering a day-to-day calendar based on the Bhutanese lunar year. This app is derived from the Datho, a traditional astrology book published by the Dratshang Lhentshog. Users can access daily predictions in both English and Dzongkha, providing insights into the best and worst days for various activities, such as starting a business or traveling.

With predictions available until the next Bhutanese New Year, the app includes features such as good and bad days by birth sign, directions for disposing of ritual cakes, and specific days to avoid for property dealings and erecting prayer flags. The app is optimized for Android 4.0 and above, ensuring accessibility for a wide range of devices.