I have looked at the App. It uses the 8 House Feng Shui Formula. This formula states the best directions for the person (Wealth, Family, Health and Spiritual aspects). These directions are unique to the person and are based on the person’s date of birth.
The application of Feng Shui is not about one particular formula, but it is holistic – the whole environment that the person is living in. This includes the energy coming, its distribution and how it leaks away from the house, as well as the compass directions. Also considered are the structure and the design of the house.
This App only considers one aspect and does not give the whole complete picture.
Like so many things in life, it is your choice.
Feng Shui is about getting the benefit from its application and not only about the technicality of applying one or more formulae.