Fitbit is rolling out an ECG app to the Charge 5 Fitness Tracker

Fitbit released its Charge 5 fitness tracker with a brand new design and a colour screen in September, but it launched without two key software features: an electrocardiogram (ECG) app and Fitbit’s new Daily Readiness Score, which recommends how hard you should work out. More than a month after the Charge 5’s release, those features are now rolling out. The ECG app takes a reading of your heart’s rhythm to assess for atrial fibrillation. To take the reading, open the app, put your fingers on the stainless steel panels on each side of the Charge 5, and wait for 30 seconds. ECG apps are showing up in more wearables, including Fitbit’s own Sense smartwatch and the Apple Watch, but you shouldn’t take readings from the apps as a definitive diagnosis of atrial fibrillation. Your Fitbit device assesses your activity, heart rate variability, and sleep to calculate the score. The Daily Readiness Score is a Fitbit Premium-exclusive feature, so if you want to use it, you’ll have to be a member of the $9.99-per-month subscription service. It is supported by more Fitbit devices than just the Charge 5.