Oh, and I don't know if you can tell the number of people that downloaded it. There might be another site that tracks that.
I'm not sure, but I'm guessing you can probably download it without registering. Though, you may or may not be able to use it without registering.
You can kind of tell who has only registered, and who is actually using it by looking at their points. Anyone greater than 50 points has used it at least once. Maybe 10-25 percent of registered people have used it on a run or walk?
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