Version 2.3:
1- Added Umm Al-Qura Calendar provided by Google. Supported by Android 7.0 and above.
2- Improve Prayer Notification and Reminder handling while the device is in Standby or Battery Optimization mode. Supported by Android 6.0 and above.
3- Fajr Alarm is improved and added to system alarms. Supported by Android 5.0 and above.

Version 2.2.3:
1- Fixed a bug where some notifications might appear an hour earlier for some prayers on few devices.