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That Doctor show I mentioned up thread did a comparison with apps in a recent episode and found the same software on different devices measured quite different heart rates. Basically I wouldn't bother with any phone HR software or anything like fitbit, etc for accurate HR. Use a Polar HRM or Garmin or something similar. I've got a Polar I've not used for years you could borrow and compare with what your phone reads.
hippy
TvH
I actually found it over-read my heart rate most of the time. Very sensitive to placement.
Just set it up through the app profile, but doesn't give options for recording lean mass or anything. But even then, working off the sensibly conservative muscleforlife calculator, I'd still only be using ~2500 before exercise even if I was only 15% body fat