hi, yes, i am using an app called Runtastic pro ( paid vers ,as it gives h/rate readings )
Then i also have a " Runtastic gear version " in Samsung store for the gear watch .
One point to note is that you have to have a bluetooth h/rate monitor/ strap
i use a POLAR bluetooth combo see pic.( No problems ,but at first a bit tricky to set up ,but works 100% afterwards)
yes then there is the S health app on phone Note 3 that you can also use.
it works on the ANT + technology where mine works on bluetooth v 4.