Apple first talked about his Heart Study program last September when they launched watchOS 4. Apple teamed up with Stanford University in the program.
The Cupertino-based company plans to use the heartbeat data to inform patients, doctors and researchers of an unnatural heartbeat.
"Working with the medical community, not only can we inform people about health issues, we are also able to assist in the discovery of heart knowledge," Apple Chief Operating Officer Jeff Williams said in an official statement.
This Apple-made app uses technology on Apple Watch to calculate heart rate via a green LED light that blinks hundreds of times per second and a photodiode that detects the amount of blood flowing on the wrist.
Users who participate in this survey will get a notification on the phone and Watch them if found an unhealthy heartbeat and can do a free consultation with a doctor of study and asked to perform electrocardiogram (EKG) for further observation.
Currently the heart study app from Apple is only available in the App Store in the United States. Users who want to opt-in must be at least 22 years old and use Apple Watch Series 1 or later.