With this app you will be able to calculate the TOD (Top Of Descent), which is the point in cruise when the pilot has to begin the descent to final destination, the time that the descent will take and it gives you a 5 point descent profile to follow and to ensure you are on the correct vertical path. it also takes into consideration a possible speed reduction and wind. Just input a few flight data while you are in cruise and in a metter of seconds you will know when to descend. It can be used for Real Airline Pilots and Flight Simulator users.

DISCLAIMER: In case you use it in a real flight I cannot guarantee the correctness of the results made by the app. Use it as an aid!