Monitors in real-time Heart Rate Variability measures, SDRR, RMSSD, and pNN50 in 1-minute increments. RMSSD and pNN50 and to a lesser degree SDRR correlate with parasympathetic predominance, and therefore with low-stress, relaxed state. This may indicate readiness to train, handle stress better. Normal ranges in literature have been established with 24 h Holter studies and therefore are not applicable to the numbers measured by this app. Within an individual, comparisons and trends over time may be helpful.

HR is also tracked with a moving ball with the HR on the y-axis and time (60 s) on the x-axis. HR can also be tracked with haptic feedback by turning it on with a tap on the clockface but this drains the battery faster.