For kicks, as I was testing out an Alta HR for resale, I wore it, as well as my Garmin watch, and checked each of the results this morning–stock Garmin app, Fitbit app, and SAA, which tracked from my Vivoactive 3. The results have me confused and wondering which is right…
The most glaring inconsistency is deep sleep recorded:
Fitbit: 19%, 1 hr, 36 min
SAA: 59%, 4 hr, 49 min
Garmin: 53 min
The fact that stock Garmin and Fitbit caught that I woke up to take a leak at 5 a.m. and SAA didn’t is inconsistent as well. I’m sure there are other inconsistencies, but what do I make of it all?