
Fitbit Sense 2
Health smartwatch with continuous stress monitoring and GPS
Reviewers mostly praise Fitbit Air for its comfort and sleep tracking, calling it a near-perfect sleep tracker that rivals Whoop. The screenless design is lightweight and easy to wear 24/7, with up to 7 days of battery life and accurate step, heart rate, and sleep data. However, some users report a buggy app where workouts disappear, poor heart rate accuracy during running, and a lack of elevation tracking.