Al-Amin Calendar "the Companion of Believers" is a free Android application that helps Muslims worldwide to keep track of their prayer times. This app is not just a calendar, but it also contains a wealth of knowledge, including proverbs, advices, Noble Prophetic Sayings, and daily renewed articles that enrich Muslim lives through the Qur'an and Sunnah. Al-Amin Calendar also allows users to detect the prayer times in their city and all over the world.

One of the most notable features of this app is that it provides users with the direction of the Kaaba, which is essential for facing the right direction when performing prayer. Additionally, it helps users find the nearest mosque for prayer and allows manual setting of the Hijri month. The app also contains different ways to calculate prayer times, making it suitable for Muslims who follow different schools of thought. Al-Amin Calendar is a gift and presentation of the Eminent humane scholar Mohammed Amin Sheikho science website, and most of the topics included are excerpted from his books.