The ECG App

To give you an even more in-depth look at how well your heart is working, your Apple Watch provides basic ECG capabilities. This app lets you take a simple one-lead electrocardiogram that tracks the electrical pulses that make your heart beat. While it’s not as accurate as a medical ECG, it’s useful for letting you know if it’s a good idea to see your doctor.

Plus, since you’re wearing it all the time, it can detect intermittent conditions that a hospital ECG might miss. This can help you know what your heart rhythm looks like, and it’ll be easier to see whenever something feels off with your heart. For instance, if the upper and lower chambers of your heart are out of rhythm, you might have Atrial Fibrillation (Afib).

The ECG app is only available on the Apple Watch Series 4 and later and the Apple Watch Ultra. It’s not available on the Apple Watch SE, although that model can still detect irregular heart rhythms that could be symptomatic of Afib.