Low SpO2 can be a sign of problems like sleep apnea that should be investigated by your doctor.īoth watches will monitor your sleep stages throughout the night (light, REM and deep) and give you a report each morning showing how long you spent in each stage.

The Fitbit Sense and Versa 3 both have SpO2 sensors to measure blood oxygen saturation overnight. The watches will also track your heart rate and step count throughout the day. If atrial fibrillation is detected, the Fitbit app can produce a report that you can share with your doctor or a relative.īoth watches feature 20+ goal-based exercise modes, plus on-board GPS and GLONASS so you can track runs and bike rides without carrying your phone. The Fitbit Sense also has an ECG sensor, which is used with the Fitbit ECG app to detect signs of atrial fibrillation (an irregular heart rhythm). You can access the Fitbit Sense's EDA scanner easily through the watch's app menu (Image credit: Ida Blix) You will also be prompted to record your mood, and the Fitbit app provides a space for you to enter any factors that have might influenced your mood or stress level. Once the time has elapsed, you'll see how many EDA responses were recorded the more responses, the more stress. To use it, hold your palm over the watch's face and sit quietly for a minute. One of the main differences between the two watches is the Fitbit Sense's stress measurement sensor, which measures changes in your skin's conductivity (electrodermal activity, or EDA), which can be indicative of physical or emotional stress.

Fitbit Sense can also take ECG readings.The Fitbit Sense is available in carbon/graphite and lunar white/soft gold. The Fitbit Versa 3 comes in midnight/soft gold, black/black and pink clay/soft gold. Otherwise, the only differences are the default watch faces (which can be changed through the Fitbit app) and the choice of colors. The only noticeable difference is a small indentation on either side of the Fitbit Sense's screen, indicating where to place your hand to use the electrodermal activity sensor (more on that shortly). The Fitbit Sense and Fitbit Versa 3 look almost identical, with the same square face, aluminum case, and soft silicone strap (other bands are available, and fit both devices).

Fitbit charger sense