This is based on How the Planets and Stars effects Our Life.
Grah Prabhav app will give you information about certain aspects of a person's life like the , position of stars and planets and phenomenon on Earth including human life, for example the effect of a full moon on human life, Sun effect on persons life and same for other planets.
This is one type of Jyotish Shastra known as Horoscope. and your Kundali shows how and which planet will effect you more for your life, either planet reaction will be Good and sometime it will bad.
App will give you information about Grah and Nakshatra's behave with you and your family, business and many more.