مقاليد السموات والأرض is a free Islamic reference app developed by Hala Hussein for Android devices. The app contains a collection of supplications, invocations, and verses from the Quran that are recited during morning and evening prayers. It also includes the 99 names of Allah, verses of healing and protection, verses of tranquility, verses of protection, and invocations of refuge. The app also features a beautiful description of Allah using sublime words written by Sheikh Muhammad Omar Al-Balannouri.

The app is easy to navigate and provides a comprehensive guide for Muslims seeking to increase their knowledge of Islamic supplications and invocations. The app is a great resource for those who want to memorize and recite these invocations on a daily basis. Overall, مقاليد السموات والأرض is an excellent app for those seeking to deepen their Islamic knowledge and strengthen their connection with Allah.