HR APP w/HR Monitor

Options
Do you use an app on your phone to connect with your HR monitor? If so, which one? I have a Bluetooth HR monitor, and MapMyFitness tracks my HR, which is awesome! Shows the average, high and low. However, it's registering at 0 calories burned. I emailed tech support to try and figure it out, but am anxious to try something that will work. I heard Endomondo was good...??? Thoughts?