This app of 7 Islamic Duaas conttained important duaas which is expected every muslim should memorized and recites daily. because the Prophet Muhammad said about remembering Allah:

Do not talk too much without remembrance of Allah. Indeed excessive talking without remembrance of Allah hardens the heart. And indeed the furthest of people from Allah is the harsh-hearted. (At-Tirmidhi).
Duaa is very important in our life, it served as protection against evils and so on. so be endevour to be reciting these duaas as they are from sunnah. Jazakhallahu khairan