Race yourself in real time.
Go Ghostrace allows you to select a previous ride or run you have done, and compete live against that performance. As you ride or run that same route, Go Ghostrace tells you if you are ahead or behind and your time difference at any point of that activity.
Go Ghostrace requires a Strava account for ride and run data.
Note that while Go Ghostrace is designed to be as efficient as possible, continued use of GPS running in the background can dramatically decrease battery life.
Go Ghostrace yourself.