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Unit: ms
Variation in time between heartbeats (RMSSD)
10
Min
150
Max
ECG
Measures electrical activity of the heart to detect rhythm abnormalities
Gold standard for HRV
PPG
Optical sensor that measures blood volume changes to derive heart rate and SpO2
Derived from pulse intervals
Apple
Apple Watch Series 10
$399+
Oura
Oura Ring 4
$349+
Samsung
Samsung Galaxy Ring
$399
Samsung Galaxy Watch 7
$299+
WHOOP
WHOOP 5.0
$199+