HijriahKu shows you the Hijri calendar month by month, with sunnah fasting days and Islamic holidays marked right on it. You also get a sunnah fasting schedule sorted by what's coming up next, a countdown to Ramadan, and a date converter that works both ways between Gregorian and Hijri. Everything runs on your phone, so it keeps working offline too.
The dates are calculated with the Umm al-Qura calendar, the same calculated calendar behind most printed Hijri calendars. Official dates in Indonesia are decided separately through the religious authority's moon-sighting (rukyat) session, so they can land a day apart — most often for the start of Ramadan and the two Eids. That's why the Islamic Holidays section has the Hilal (Hisab) and Rukyat options, so you can see the difference clearly.
One more thing: HijriahKu sends anonymous usage counts to Kumbang Logika — just which features get opened, never the dates you look at or anything on your phone. It helps us see which features people actually use.
