Apple’s new ResearchKit allows you to participate in important medical research studies easily through your iPhone. Stanford Medicine invites you to join the MyHeart Counts study to improve our understanding of heart health. The MyHeart Counts app is a personalized tool that can help you measure daily activity, fitness, and cardiovascular risk. It can also help you better understand your own heart health and contribute to our understanding of how to keep hearts healthy around the world. Join our research effort and make your heart count today!

The app can help you measure your activity through the sensors in your iPhone or the Apple Watch, or any wearable activity device linked to Apple Health App. If you are able, you can also do a walking fitness assessment. Plus, using your cholesterol results and blood pressure, the MyHeart Counts app will provide a calculation of your risk for future heart attack or stroke, as well as a relative “heart age.” By helping you track your activity levels and giving you feedback, we aim to help people be more informed and empowered in their health. We may also ask you to test different approaches to help you be more active so we can understand how mobile apps in the future can help prevent heart disease.

Key Features:

Record and track your:

• Physical activity through your iPhone or a Apple Health App-linked device
• Fitness level, if you are able, through a 6 minute walk test
• Risk score for heart disease or stroke, and your corresponding “heart age”

Receive reminders and notifications about:
• Your activity and sleep
• Surveys on Physical Activity Readiness and other health factors
• Entering blood pressure and cholesterol levels to calculate your risk score

Get educated:
• Learn about your activity level and walking fitness
• Learn about your risk factors and how to improve
• Links to learn about heart disease and stroke and the American Heart Association’s “Life’s Simple 7” guide to heart health

To join the Stanford MyHeart Counts research study on heart health, you need to:
• Be 18 or older
• Reside within the United States, United Kingdom or Hong Kong
• Be able to read and understand English

Install the app today and learn about your heart, help research, and join together in the fight to stop heart disease!

Continued use of GPS running in the background can dramatically decrease battery life.

What’s New

Version 2.4

Bugfixes for iOS 14

Ratings and Reviews

4.5 out of 5
429 Ratings

429 Ratings

Reader from The South ,

Application freezes

This application wasn’t tested by developers. It’s freezing as I trying to set it up. Trying to send an email to support team, getting a message that email is not valid.

xyoga15 ,

Hardly confidence inspiring

The current app, updated recently, seems half-baked. That is, activities responses do not register when completed. Walking activity test is unrealistic, asking participant to sit down immediately upon completion. It’s as if app’s designers have not tested in real world. App will not accept ‘no’ as response to 23&me sharing; not possible to opt out of sharing. Developer web site link is hopelessly outdated, describing Apple’s iPhone models as 6s and 7s which this current app is designed for. Yikes! All in all, not very confidence building in terms of sharing one’s biometric data . Lack of attention to these visible details and awkward interface certainly give pause, and this only after just getting started. Well-intentioned, but hardly thought through. There are very concerning disconnects. One wonders if data gathered here suffer as well. Is this project really being supervised?

Developer Response ,

Thank you for these feedback. Version 2.2 released today should address these concerns.

EgClone ,


The app is not working right after the last two updates from Apple. I do the 6 minute walk and at times it is hard for me to get it started. I have to tap the start button numerous times to get the timer started. Sometimes after it starts I get the message “Walk as far as you can” by the number of times I had to tap the Start button. If this happens then the app will just quit.

Today I was able to get it started and heard the “3 minutes remaining” message. Sometime later I checked to see how much time was left, but the app showed the home screen and had quit. This behavior has been going on for quite sometime.

I have an iPhone 11 and have the latest iOS installed.


Stanford University
136 MB

Requires iOS 11.4 and watchOS 5.1 or later. Compatible with iPhone and iPod touch.



Age Rating
Frequent/Intense Medical/Treatment Information
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

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

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