Sal Calendar is a free Android app that offers both Gregorian and Hijri calendars. It provides the date of the day in both Gregorian and Hijri calendars, making it easy for users to keep track of important dates. The app also offers a smart Azan playback feature that can be disabled in the settings section.

The app comes with many useful features, including the ability to view history in all Gregorian, Hijri shamsi, and Hijri Ghamari calendars. It also offers tools such as a Qibla Finder, a convert history tool, a smart rak'at counter, a zikr counter, and a flash light. Users can even select the sound of the Muezzin for the Azan.

Overall, Sal Calendar is a useful app for Muslims who want to keep track of important dates in both Gregorian and Hijri calendars. The app is easy to use and offers many features that can help users with their daily prayers and rituals.