# My Heart Counts

> Citizen science app for heart health research with AI coaching and personalized insights. (iPhone/iPad app by Stanford University.)

- Source: https://appshunter.io/ios/app/my-heart-counts/id972189947 (this page in markdown: same URL + `.md`)
- Developer: [Stanford University](https://appshunter.io/developer/292922032)
- Category: Medical, Health & Fitness
- Price: Free
- Rating: 2.33/5 from 3 App Store ratings · 110 written reviews indexed
- Age rating: 17+
- Requires: iOS 18.0 · 167 MB
- Languages: English, Spanish
- Released: 2015-03-09
- Data updated: 2026-08-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/my-heart-counts/id972189947/reviews.md

## What is My Heart Counts?

Turn your daily activity into a powerful tool for science with My Heart Counts, a revolutionary research study and personal health app from Stanford University School of Medicine, the University of Washington, and Imperial College London.

Heart disease is the #1 cause of death worldwide. But what if we could change that, together? My Heart Counts invites you to partner directly with researchers to help us understand how activity, lifestyle, and fitness relate to cardiovascular health. This isn't just another fitness tracker, it's your chance to be part of the solution.

WHY IS THIS SO EXCITING?
- BE A CITIZEN SCIENTIST: You are not just a user; you are a research partner. By simply living your life, you contribute valuable data to one of the largest-ever studies on heart health. Your contribution can help unlock the secrets to preventing heart disease.
- YOUR PERSONAL AI HEALTH COACH: This study includes a physical activity randomized controlled trial. My Heart Counts now features an intelligent coach powered by a cutting-edge Large Language Model (LLM). The coach provides personalized tips and encouragement to help you build healthier habits, one step at a time.
- GET PERSONALIZED INSIGHTS: Discover your "Heart Score," a unique measure of your cardiovascular health based on your activity levels and other data. Learn more  about your own patterns and how they contribute to overall health.
- POWERED BY STANFORD MEDICINE: This app is developed and run by leading cardiologists and researchers at Stanford University, the University of Washington, and Imperial College London. You can trust the science and know your data is handled with the highest standards of security and privacy.

HOW IT WORKS:
1. Download & Consent: Join the study in minutes with a simple, transparent consent process.
2. Track Your Activity: The app uses the motion sensors in your iPhone or connects to your Apple Watch to automatically and securely measure your daily activity.
3. LLM-Powered Physical Activity Recommendations: Our LLM-powered coach will provide motivation and personalized physical activity advice.
4. Get Your Score & Contribute: See your activity patterns, get your Heart Score, and know that every step you take is advancing our collective understanding of heart health.

KEY FEATURES:
- Automatic Activity Tracking: Seamlessly monitors your steps, distance, and active time.
- AI-Powered Coaching: Chat with our LLM-driven coach for personalized motivation and guidance on your physical activity journey.
- Personalized Heart Score: Get a unique score and insights into your heart health.
- Secure & Private: Your data is encrypted, anonymized, and stored on secure servers. Your personally identifiable information is never shared.
- Optional Physical Activity Testing: Participate in a classic fitness assessment to provide even more valuable data.

DATA SAFETY & SECURITY: 
We take your privacy as seriously as your heart health and your data is protected by the highest institutional standards:
- Open-source development: My Heart Counts is developed as an open-source project, allowing you to verify the functionality and security. We invite open-source contributors and are building on an open-source stack including the Stanford Spezi ecosystem.
- Enterprise-Grade Security: Your data is managed by Stanford Medicine Technology & Digital Solutions (TDS), utilizing the same rigorous security infrastructure used by Stanford Medicine.
- HIPAA Compliant: We are fully compliant with HIPAA regulations to ensure your Protected Health Information (PHI) remains safe and confidential.

Join a global movement for better health. Your motion has meaning.

Download My Heart Counts today and turn your daily activity into scientific discovery!

## Key features

- Citizen science participation
- AI-powered health coach
- Personalized Heart Score
- Automatic activity tracking
- Secure and private data handling
- Optional physical activity testing

## What do users think of My Heart Counts?

Overall sentiment: neutral

**Pros**

- 🚀 Easy to contribute to research
- 📊 Potential to advance medical knowledge
- 👍 Simple and straightforward

**Cons**

- 🐛 Crashes and stability issues
- 🔋 High battery consumption
- 📉 Inaccurate activity tracking
- 🤔 Repetitive and redundant questions
- 🤷‍♀️ Unclear instructions and feedback

**Commonly reported bugs**

- Login and authentication problems
- Six-minute walk test not recording properly
- Inconsistent data syncing and storage
- Incompatibility with newer iOS versions

**Most requested features**

- Ability to input previous day's data
- Integration with wearable devices and health apps
- More detailed feedback and insights
- Contact information for support and feedback

## Recent user reviews (10 of 110)

All indexed reviews: https://appshunter.io/ios/app/my-heart-counts/id972189947/reviews.md

### 1/5 — Crashes constantly

*2026-07-25*

I’m frustrated because I can’t complete the surveys. The app invariably crashes while I take them. It even crashed when I tried to fill out the feedback form.

### 1/5 — Crashes after 20 seconds

*2026-07-16*

The app closes after 20 seconds and I lose all my work (like answering surveys)

### 5/5 — Easy to use and helpful

*2026-05-11, version 4.0.4*

Really enjoying the MHC app. Interface is easy to use and navigate. Viewing health data and trends is very helpful and clear. Feels responsive, polished, and user friendly. Excited to be using this going forward and seeing what research comes from it.

### 5/5 — Outstanding updates!

*2026-05-11, version 4.0.4*

This app has really gotten better in recent months! Way to go to the dev team

### 1/5 — Constant crashing.

*2026-04-23, version 4.0.3*

The latest version on iOS 25.4.2 is constant crashing. Can’t get in to do any of the surveys and tasks

### 5/5 — An easy way to contribute to research

*2023-08-06, version 2.4.1*

Making my daily entries is quick and easy

### 4/5 — Daily check in fine; six-minute walk broken

*2022-01-23, version 2.4.1*

Generally my dialy report is easy & makes me feel useful. But for that couple of years the six- minute walk has failed to work.  I start it and gives me instructions to start and never speaks to me again or records a result.

### 3/5 — The right idea

*2021-08-25, version 2.4.1*

Daily small survey is do-able. I would like resting HR instructions & prompt 1x per week, but no such function. 6 min walk test is nice. Improvements would be to make clear if activities from Healthkit were being used or not (I’m not certain if my workout yesterday was “recorded” or not. In the past, I would enter the data manually into this App, redundantly to entering it manually into the z health App … except the formats are different!).
Further, the circle (yester, today, week) make no sense to me.

### 3/5 — Crashing iOS 14.2 iPhone 12 Pro Max

*2020-11-14, version 2.4*

Moved over to iPhone 12 Pro Max app crashes on open with Face ID.. Turned off Face ID and it ask for 4 digit code. Never set one up. Never asked to set one up.

### 4/5 — Starting up

*2020-09-16, version 2.3.2*

I would have preferred to have an instruction list to start up. I could refer to it rather than muddle along not knowing what to do or wether I was doing it correctly.

## Frequently asked questions about My Heart Counts

### What does My Heart Counts do?

My Heart Counts is a research study and personal health app that allows you to contribute your daily activity data to scientific research focused on understanding cardiovascular health. It also provides personalized insights and an AI-powered coach to help you build healthier habits.

### What are the key features of My Heart Counts?

Key features include automatic activity tracking, an AI-powered coach for personalized motivation and guidance, a unique "Heart Score" for insights into your cardiovascular health, and secure, private data handling. You can also opt-in for physical activity testing.

### Is My Heart Counts free to use?

Yes, the app is free to download and use. It is part of a research study and does not have in-app purchases or advertisements.

### What devices is My Heart Counts compatible with?

The app uses the motion sensors in your iPhone or can connect to your Apple Watch to track activity. Specific iOS version compatibility is not detailed but it is designed for iPhone users.

### How can My Heart Counts help me?

By participating, you contribute valuable data to one of the largest heart health studies, potentially helping to unlock secrets to preventing heart disease. You also receive personalized insights into your own heart health and guidance from an AI coach to improve your physical activity and habits.

## Version history (last 5 releases)

### 4.0.7 — 2026-08-08

Bug fixes and performance improvements.

### 4.0.6 — 2026-08-05

What’s Changed
- fixed several crashes and issues for iOS 26.5 users
- improvements to the onboarding flow and demographics data collection
- new: the app now allows editing health conditions after the initial onboarding
- fixed some inconsistencies in the heart health tab
- SensorKit improvements
- fixed various random crashes

### 4.0.5 — 2026-06-26

What’s Changed
- fixed: the ’today’s tasks’ list would sometimes contain tasks completed on previous days
- improved HealthKit integration
- reduced on-device storage usage
- fixed a potential error when using outdated versions of the app
- a ton of small bug fixes and efficiency improvements
Full Changelog: https://github.com/SchmiedmayerLab/MyHeartCounts-iOS/compare/4.0.4...4.0.5

### 4.0.4 — 2026-04-23

What’s Changed
- fixed a bug where the app would sometimes crash on launch
Full Changelog: https://github.com/StanfordBDHG/MyHeartCounts-iOS/compare/4.0.3...4.0.4

### 4.0.3 — 2026-04-17

Bug fixes and performance improvements.

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| --- | --- | --- | --- |
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All apps by Stanford University: https://appshunter.io/developer/292922032

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-09.*