I recently downloaded the Swim.Com app which is available for the Gear Sport. It seems to be a better tracker/lap counter than the built in swim app. (I have also tried the Speedo On app and found it totally useless.) I had used the swim.com app on my Pebble Time and liked it so when I saw it was available for the Gear Sport, I had to give it a try. I believe the watch app records some heart rate statistics but that info does not get transferred to the Swim.Com app on my phone. So you can observe heart rate info during your swim but won't have a permanent record of it like you do for the native Samsung swim app. FYI, I haven't found a way to transfer the swim.com information to Samsung Health.