Someone left a comment about ezFengShui only calibrates for the entrance. The fact is both ezFengShui and ezFlyingStar offer cure for your house or office as a whole. The main entrance determines the Feng Shui nature of your home or office.
The cure from both apps use a 9 palaces system for easy finding of which corners your home or office require the cure.
All in all, my apps offer an easier way for simple Feng Shui cure that everyone can do for their home and office.