Kalender Puasa Wajib Sunnah is an Android application developed by Miernabase Dev that provides a calendar for Muslim fasting. The app includes reminders and a guide on how to perform obligatory and voluntary fasts. Fasting is one of the five pillars of Islam, and it is a religious duty for all Muslims. This app aims to provide knowledge and guidance for Muslims who want to learn more about fasting.

The app features a Gregorian calendar with the corresponding Hijri dates. The dates when fasting is required, recommended, or prohibited are marked with different colors on the calendar. The app also provides information on the significance of each date. The app's user interface is simple and user-friendly, making it easy for users to navigate and access the necessary information.