Kalender Indonesia is a free iPhone app developed by Edi Ermawan. It falls under the category of Business & Productivity and offers a complete calendar with national holidays for the years 2023, 2024, and previous years. Additionally, it includes information about collective leave days (Cuti Bersama) for the same years, as per the regulations set by the Indonesian government.

The app also provides reminders for important days and features the Pasaran Jawa, allowing users to view the Javanese calendar (Wage, Kliwon, Legi, Pahing, Pon). Users can easily switch between the regular calendar and the Javanese calendar. Moreover, the app offers an eternal calendar, allowing users to view any year they desire.

With a simple and familiar design resembling traditional Indonesian wall calendars, the app provides a user-friendly experience. Users can swipe left or right to navigate between months and can add daily notes with attractive color tags. The app also offers customization options such as font size and more.

Despite its comprehensive features, Kalender Indonesia maintains a small app size, ensuring it doesn't take up much storage space on your iPhone.