In combination with the Revbox Erg and the additional Revbox Sensor Kit the Revbox Power App will give you information about power, cadence, energy, heartrate and speed. The app can also track your workouts which you can upload to Trainingpeaks and in the near future to other training software as well.
The Surface Simulation is available for a one time payment of 12.99 USD. The Upload to TrainingPeaks function is available for 12.99 USD per month or 99.99 USD per Year. You can subscribe and pay through your iTunes account. Your subscription will automatically renew unless cancelled at least 24 hours before the end of the current period. Aurto-renew may be turned off by going to your account settings after purchase.