How ZoneSteady calculates your heart rate zones
ZoneSteady can calculate personalized zones from your heart rate reserve using the Karvonen method. Heart rate reserve is maximum heart rate minus resting heart rate. This differs from using a simple percentage of maximum heart rate, and you can also set custom zones.
Compare BPM ranges, not just zone labels
Different apps define “Zone 2” differently, so compare actual BPM ranges, not just the label.