Electrodermal activity is one way to measure your body's reaction to stress the Sense and Fitbit's app will then guide you through mediation sessions and other stress-relieving activities, and suggest ways to help mitigate stress. You use this feature by placing the palm of your hand on top of the Sense. Last, the Fitbit Sense has an electrodermal activity (EDA) sensor, which measures the amount of electricity traveling through the outer layer of your skin. While Fitbit says that it's not medically certified, a variance in your skin temperature could be an early indicator. The underside of the Fitbit Sense also has a skin temperature sensor, which tracks the temperature of your epidermis nightly changes in your skin temperature could indicate such things as the onset of an illness, menstrual cycle, or pregnancy. The Sense will also send you alerts if your heart rate is too high or too low outside of your normal zones. For starters, it has an ECG app (pending FDA approval) which can help monitor your heart for signs of atrial fibrillation (AFib), a condition where your heart beats irregularly, and could be a sign of something more serious.

However, the Fitbit Sense has a few more health features built in. They can both track your heart rate and activity all day, as well as your sleep at night. Let's start with the features they share, though: Both devices have GPS built in, which means you can track your runs and not have to bring your phone with you.Īnd, because both have heart rate sensors, you get Fitbit's Workout Intensity Map, which shows where on your run or bike ride your heart was pumping the fastest. The biggest differences between the Fitbit Sense and the Versa 3 lie in their respective health and fitness features. Fitbit Versa 3: Health and fitness features The bands for both watches are interchangeable, and Fitbit offers dozens of options we expect there will be a pretty robust market of third-party bands in the near future, too. The Sense's case is available in graphite stainless steel or soft gold stainless steel, while the Versa 3 comes in soft gold aluminum or black aluminum.