


Blood oxygen and skin temperature sensors: The Fitbit Inspire 3 features some advanced sensors, including blood oxygen monitoring (which the device uses in calculating sleep tracking metrics) as well as skin sensors to measure your core temperature, which the device can use in the app’s ovulation prediction tool as well as monitoring of overall health.EDA sensors are found on the Fitbit Charge 5 and some Fitibit smartwatches. Stress management: The Inspire 3 offers stress management tools using metrics like pulse and respiration, but it lacks the electrodermal activity (EDA) skin sensors that estimate your stress levels by measuring the tiny electrical currents in the skin.

Always-on display: There’s an option to keep the Fitbit Inspire 3’s display on all the time, which is convenient, though that option does take a severe toll on battery life.
