The Apple Heart Study app is an innovative research study that uses data from Apple Watch to identify irregular heart rhythms, including those from potentially serious heart conditions such as atrial fibrillation (AFib). This study is being conducted in collaboration with Stanford Medicine to accelerate discovery in heart science.

- AFib is one of the most common forms of irregular heart rhythm. It can lead to blood clots or heart failure and is a leading cause of stroke. AFib affects tens of millions of people — but many of those people don’t experience symptoms, so it often goes undiagnosed.

- The Apple Heart Study uses an app designed to notify participants if an irregular heart rhythm is observed.

- The app will passively monitor your heart rate along with your heart rhythm. If an irregular heart rhythm is observed, the app will notify you.

- After the notification, you’ll receive a free video consultation on your iPhone with the study’s medical professionals for further analysis.

- The video consultation connects you with a board-certified, licensed primary care provider from American Well* - 24 hours a day, 7 days a week.

- In some cases, the doctor may recommend a BioTelemetry electrocardiogram (ECG) patch for additional monitoring. The patch will be mailed to you at no cost and should be worn for seven days. The ECG data gathered over this period will be used to determine whether AFib or another type of irregular heart rhythm is present.

- Participation in the Apple Heart Study is voluntary. After you download the app, you’ll be asked to give your consent for participation. The heart rate sensor data you provide over time will be collected by Stanford Medicine and Apple for research analysis. Apple will not have access to any information that can directly identify you.


- Requires Apple Watch Series 1 (Fall 2016 model) or later with watchOS 4 and later. The Apple Heart Study does not support the original Apple Watch.
- iPhone 5s or later with iOS 11 or later
- You must be a U.S. resident, 22 years or older, and meet other study eligibility criteria as described in the Apple Heart Study app
- You must provide your consent to participate in the study

*Doctors provided by American Well’s clinical partner, Online Care Group.

What's New

Version 1.1

This update includes bug fixes and other improvements.

Ratings and Reviews

3.1 out of 5

625 Ratings

625 Ratings

All went smoothly with sign up...

Brad Hanes

I’ve bought, and still own all three I watches to date.... iWatch 1, 2, & currently three. I had, “zero” issues downloading the heart study app into my iWatch 3. I’m a huge Apple fan and I’m so excited about future in the health field. It’s just amazing that we will all be able to wear this watch on our wrist one day and monitor so many body functions. I look forward to the day were you can download the info Into your doctors computers. I’m betting one day our doctors will receive real time health info from any patient of theirs who wears an Apple iWatch. Can you imagine your doctor calling you and saying I need to see you as I don’t like the readings your iWatch is sending me about some of your body functions. Better yet how about the day were your doctor is notified by your iWatch that you could be having a stroke and the iWatch is able to administer medication from an onboard reservoir. Don’t laugh people as this is what our future will likely be and Apple is aggressively pursuing health issues with its devices, anyway the app has worked well for me so far

Why so many bad reviews?


I read a few reviews and I honestly don’t know why so many people are complaining about this VOLUNTARY heart study. I signed up with ease, and when Apple was ready to collect my data I got a notification from the app, and it was a smooth process to set up. I’ve been involved in this study for 22 days now, and literally have no complaints. What is there to complain about? It runs on its own, you literally don’t do anything besides wear your Apple Watch (unless they detect something they need to address). Stop complaining people!!!! The public always finds something to complain about.

From one star to five stars

Arizona cactus cowboy

This is a follow-up to my first review. The app notified me it was ready for me to participate again and it seems to be working again so maybe the problem has been fixed.

My First review: The app worked fine for the first two days and then it stopped working. After two more days ( a total of four days) of it not working, I closed it and then re-opened it. It asked for my name and birthdate and said that it will notify me when it’s ready for me to participate. And that’s how it’s been ever since, with absolutely no indication that it is doing anything.


Apple Inc.
26.7 MB
Health & Fitness
Requires iOS 11.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, and iPhone X.
Age Rating
You must be at least 17 years old to download this app.
Infrequent/Mild Alcohol, Tobacco, or Drug Use or References
Frequent/Intense Medical/Treatment Information
© 2017 Apple Inc


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer