That seems really interesting, but not $30 app interesting.

It works great! When I was on paternity leave and went out for walks with the baby in the stroller every day, it was a bit boring to just walk the same route each time. I downloaded the Fog of world app and set my self the goal of walking every meter of every street in my part of town before the end of my leave. That made it much more fun, buuuuut I haven't used it after that...

The app looks so good, but it's 35€