So far its been quite accurate and consistent. It keeps me motivated. I have not used the interval training so I cant comment on it.
I basically use it for jogging and walking. I used to use for cycling as well but havent cycled in over a year now. However, it worked well. I dont use a heart rate monitor that is compatible with this app or an Apple Watch so I cannot comment on those capabilities. For what I do, I can definitely recommend it.
Navinfl about Runtastic Running Tracker PRO, v7.1.7