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Cardiogram - Watch your Heart Rate

By Cardiogram, Inc.

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Your Apple Watch measures your heart rate more than 200 times each day. Cardiogram organizes heart rate, activity, and sleep data from the Health app and makes it meaningful and useful.

On your Apple Watch, the Cardiogram watchOS app and complication shows you a graph of your heart rate in real time.

On your iPhone, you can get more details and historical trends:
• The Timeline tab shows your heart rate each day, with a detailed view for workouts and a special interface to track spikes related to stress, diet, or exercise.
• The Metrics tab shows you how your resting heart rate, activity, and sleep are trending over the last few weeks or months.
• And the new Habits tab lets you find a new healthy habit you'll love, invite a friend to share metrics, and optimize your overall health and fitness.
• The "Me" tab lets you build a profile and share your health data with medical researchers, to contribute to studies on abnormal heart rhythms like atrial fibrillation, heart failure, and more. Note: Cardiogram is not a medical device and is currently for research purposes only.

Cardiogram displays data from the Health app, including heart rate, steps, Apple Watch activity rings, and sleep, in chart or graph format, and lets you compare to other users.

What's your heart telling you?

What's New in Version 2.5

Updates in Cardiogram 2.5:
• New UI! The Timeline and Metrics panes are now more beautiful than ever!
• We show you the same heart rate data, except with bigger charts that's easier to read and make gestures like pinch-to-zoom easier to use.
• We now have a brand new set of icons for tagging your heart rate spikes. We hope these will let you become more expressive in how you feel and make sharing your Cardiogram cards with friends more engaging and fun!
• As always, we'd love to hear your feedback as we continue to improve the Cardiogram app. Tell us your thoughts at Thanks!

Updates in Cardiogram 2.0.4:
• Fix Habits invite link for iOS 8 and older.

Updates in Cardiogram 2.0.3:
• Invited friends to join you on a Habit, and you can now ping your friends after completing the habit each day to help them stay on track!
• Updated Habits invite link. If your friend doesn't already have Cardiogram installed, the invite link will take him/her to the app store, and once Cardiogram opens, your friend will be added to your Habit automatically.

Updates in Cardiogram 2.0.2:
• Fixed one more issue with data refresh, due to a problem with HealthKit permissions when upgrading to iOS 10.1.
• If you're still seeing stale data after upgrading to 2.0.2, try restarting the app (double-click home button, find Cardiogram, and swipe up).
• Please email us if you're still having trouble with data sync: Thanks!

Updates in Cardiogram 2.0.1:
• Fixed bug where data would not refresh. If you've recently upgraded to iOS 10.1 and you're seeing stale data, please email us:
• Updated Cardiogram icon in the app store.
• Smoother transition when selecting a habit from the "All Habits" tab.

Updates in Cardiogram 2.0:

Habits. We all have health goals we're working towards, but it's hard to keep track and keep up each day when you don't have data to measure progress against. We think Cardiogram can help. The Habits tab is designed to help you improve health in 3 categories: Fitness, Sleep, and Stress. Each category offers a set of evidence-based Habits you can try for 14 days. Each day as you complete a Habit, you'll be rewarded with a checkmark to congratulate your daily progress. Plus, you can monitor how the Habit improves your key biometrics, such as resting heart rate and sleep quality, on a daily basis.

To make Habits more fun, invite your friends to join a Habit with you. Research has shown that one of the best ways to keep yourself on track towards a goal is to publicly announce your commitment and work towards it with a group of people with the same goal. You and your friends can keep each other accountable on a daily basis, and motivate each other by comparing your biometric results! So what are you waiting for? Go on, invite a few friends, and find a new habit you'll love!

Also included in Cardiogram 2.0:
• New sleep quality metrics: a) Sleep Duration, and b) Sleeping BPM.
• New and revamped profiles page.

If you have ideas for new Habits to add, we'd love to hear your thoughts! Email us at:


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Customer Reviews


This counts among the all around best apps for the Apple Watch. Builds on and exceeds the factory heart rate monitor app with real time data, a better complication, analysis and insight. I highly recommend it for anyone with an Apple Watch trying to get back in shape. It is truly satisfying to watch your resting heart rate go down as you continue to work out. Watching this evidence of your heart getting healthier is great motivation to stick you your exercise goals! This app will not be leaving my Apple Watch any time soon.

Life saver

Both my husband and I have developed tachycardia for no apparent reason. We have been using this app to provide info to our primary care physicians and now our cardiologists. With this data, along with prescribed medical testing, we are getting into control. I feel confident that I have accurate information to share with my Docs when I feel symptoms. I love this app

Nice UI redesign with today's update!

I really like today's update with new UI. Everything I liked bout the app is still there, but became more esthetically pleasing. One small issue I had was that it's somewhat hard to use zoom/pinch charts on Trends page on a smaller device (iPhone SE). Would be nice to be able to see those charts at full width of the screen on such small devices.

Cardiogram - Watch your Heart Rate
View in iTunes
Offers Apple Watch App for iPhone
  • Free
  • Category: Health & Fitness
  • Updated:
  • Version: 2.5
  • Size: 39.6 MB
  • Apple Watch: Yes
  • Language: English
  • Seller:
Rated 12+ for the following:
  • Infrequent/Mild Medical/Treatment Information

Compatibility: Requires iOS 9.3 or later. Compatible with iPhone and iPod touch.

Customer Ratings

Current Version:
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