Fasting Calendar, developed by Appustaka, is a free lifestyle application available for Android 9.0 or higher. This app helps you keep track of your fasts and reminds you of important fasting days such as Monday & Thursday, Ramadan, Shawwal, Arafat, Ayyamul Bidh, Ashura, Tasu'a, and Haram days. You can also write notes on specific dates and view a list of times you did not fast. The app also provides an explanation of the benefits of sunnah fasting.

The app is available in both Indonesian and English, and you can adjust the D-1 fasting reminder in the settings menu. With Fasting Calendar, you can easily stay on track with your fasting routine and never miss an important fasting day. Enter the Ar-Raiyan gate in Paradise by observing your fasts with this app.