Mandaean Calendar is a free iPhone application developed by Twayesh Projects AB in the Business & Productivity category. This app serves as a comprehensive guide to special dates and events, providing detailed descriptions of associated customs and rituals. Users can access translations in multiple languages, including English and Arabic.

The calendar features a color-coded system for different occasions: Green for religious events, Blue for the beginning of the month, Yellow for light fasting days, Red for heavy fasting days, and Purple for commemorating important figures. By tapping on a colored date, users can delve deeper into additional information regarding the specific occasion.