How the Sensors Work
The AirPods Pro 3 contain photoplethysmography (PPG) sensors that emit infrared light hundreds of times per second. By measuring how the light is absorbed by blood flow in the ear canal, the earbuds can determine the wearer’s pulse. The earbuds also include an accelerometer that works with the iPhone’s accelerometers, gyroscope, GPS, and on‑device AI to provide a fuller picture of cardio effort and estimate calories burned.
Using Heart‑Rate Tracking
Heart‑rate monitoring is enabled by default. Users can turn it off by opening the Settings app, selecting their AirPods Pro 3 entry near the top of the screen, scrolling to the Heart Rate option, and toggling it off. The feature works with a single earbud; either ear can be used, allowing the other ear to remain unobstructed.
Viewing Data
Live heart‑rate data appears as a Live Activity on the iPhone lock screen. It can also be viewed in the Health app by tapping the magnifying‑glass icon, selecting Heart, then Heart Rate. During workouts, the Fitness app displays the heart‑rate reading, and compatible third‑party apps can access the data after the user grants permission. Siri can provide an on‑demand reading when asked, "What’s my heart rate?" without needing to touch the phone.
Compatibility and Requirements
The feature requires AirPods Pro 3 and an iPhone that can run iOS 26, which includes every model from the iPhone 11 onward and the second‑generation iPhone SE. Older AirPods models lack the heart‑rate sensor. The Beats Powerbeats Pro 2 is the only other Apple‑branded earbud with a built‑in heart‑rate sensor.
Best Practices for Accuracy
Apple advises a secure fit to ensure the sensor contacts the skin inside the ear. Users should keep their ears warm, as cold temperatures can reduce blood flow and affect readings. Earwax, moisture, skin conditions, or metal jewelry near the ear can interfere with sensor performance. Maintaining up‑to‑date personal information (height, weight, age, gender) in the Health app helps improve calorie calculations. Regular cleaning of the earbuds is also recommended to keep the sensors functioning properly.
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