Although I love Runkeeper, I know there are a lot of popular running apps out there. The problem is that once you are heavily invested in one ecosystem, it's hard to move to another one. Even if I wanted to move to another app full time, it would be hard leaving my 6+ years of information behind. Thankfully tapiriik provides a great solution. Many of the popular fitness apps have open APIs, but they don't natively talk to each other. tapiriik is trying to be the connection between them. You can sync Runkeeper, Strava, Garmin, Endomono, and many others.

The service is free, but you can pay $2 (or more) per year to automatic sync (vs manual).