Azan is a free Android application developed by El-Masry in the category of Business & Productivity. This app offers various options to alert users at prayer times with or without audio. The app is also open source and allows users to change the Azan calculation method via the settings.

The app provides an easy-to-use interface that displays the prayer times for the current location. Users can set up alerts for each prayer time, and choose between a full Azan or Takbeer only audio alert. The app also has the option to show a screen alert with or without audio.

One of the most significant features of the app is that it is open source, which means that users can access the source code on Github and contribute to the development of the app. Users can also change the calculation method for Azan based on their preferences.

Overall, Azan is a useful app for Muslims who want to keep track of their prayer times and get notifications when it's time to pray. The app is easy to use and provides customizable options for alerts and calculation methods.