iPhone Screenshots


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 2.0.3

Thank you for your continued participation and contributing to heart health research. This is a maintenance release that updates consents to reflect our 2017-2018 IRB renewal and fixes a subset of our high priority bugs. Please bear with us as we address all of the issues with the app including known open problems with accessibility, battery efficiency, the 7-Day Activity Assessment and iPhone X.

Ratings and Reviews

4.3 out of 5

371 Ratings

371 Ratings

Battery hog, no feedback-not sure it is worth the hassle


I decided to participate in the study behind this app because of the history of heart issues in my family. In the 2 weeks since I downloaded this app it has been the leading consumer of battery by quite a large amount. The sad thing is I don’t allow it to access my location services on the phone (I have an Apple Watch) and it still is a power hog. I have no idea how to limit its “Background activities”.
I also find that the heart related activities provide no feedback. You are asked to answer the same questions daily. I can handle it for a week but I have no idea how long it lasts. The “activity” that is supposed to summarize what the app has measured or pulled from measurements males no sense to me and doesn’t match what I get from my watch or phone.
So assuming this is really doing something worthwhile be patient and don’t expect to get much out of it. I’m afraid I am not going to keep it on my phone very much longer if it kills my battery since I get very little out of it.

Good Start


Having used the app for over a year, I am glad to be contributing data and appreciate the tracking since I do not have a Fitbit or Apple Watch. Three main complaints: (1) If I check -in immediately after picking up my phone in the morning, the 7-day assessment shows different values for the last 24 hours and yesterday when the only real difference is whether I was in bed from 12 to now yesterday or today. My activity is the same. It would also be nice if that report showed the total activity for the period selected rather than just for the week.
(2) The latest version has also been a serious battery hog using up to 74% of a charge. Shutting it down after checking-in works but this flaw needs fixing.
(3) Occasionally it does a cardiovascular risk assessment but offers no feedback on the factors raising the risk when reporting that it is high.

Not bad, but definitely some glitches


I've had the app for 3 weeks now and I'm not as impressed with the activity tracking aspect as I hoped. Not once has it recorded "light" activity. It's either sedentary or moderate/vigorous. That can't be right, and definitely doesn't square with what health app/activity on my Apple Watch or my Strava running activity shows. Though I average nearly an hour workout/run every day, the app today informed me I needed to be more active. It would also be nice to see how you compare to other users (by age, gender, weight) for more than just the 6 min walk test.

Hopefully the developers will address these issues, because the better the app is at capturing the date, the more useful it will be.


Stanford University
108.1 MB
Requires iOS 8.0 or later. Compatible with iPhone and iPod touch.
Age Rating
You must be at least 17 years old to download this app.
Frequent/Intense Medical/Treatment Information
This app may use your location even when it isn't open, which can decrease battery life.
© 2015 Stanford Medicine


  • Family Sharing

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

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