It boasts high-fidelity sensor technology in a tiny, discreet pebble that enables advanced 24/7 monitoring of heart rate, heart rhythm with Afib alerts, SpO2 (blood-oxygen saturation), resting heart ...

The Fitbit Air costs $99. Without a subscription, you can access your basic health data, such as activity and sleep details, in the Google Health app (formerly the Fitbit app). The Premium app ...