A:Answer It does sync with MyFitnessPal app. I have both on my iPhone and they do auto-synchronize whenever I have one of the two apps up.
However, it isn't a perfect synchronization. The Garmin app calculates exact calories burned for various movements and activities. I have found that MyFitnessPal app syncs some of these calories burned, but not all of them. So the MyFitnessPal app for me always shows fewer calories burned than what the Garmin app displays.
The MyFitnessPal app "help" function claims that it estimates calories to be burned over the day and that's why the data doesn't match. That doesn't make sense to me, but that's what MFP claims about why there is always a difference (even after Completing the Day on both apps).