Cardiogram: Heart Rate Monitor

In-app purchases
6.92K reviews
Content rating
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About this app

Cardiogram is a heart rate monitor that helps you learn what your heart is telling you. Track your heart health through your watch and understand your sleep, stress, and cardio fitness. Use interactive charts, comprehensive metrics, and notes that help analyze day-to-day fluctuations in your heart health.

Cardiogram goes beyond taking your pulse rate, it will help you build lifelong habits to optimize your heart health. Take control of your goals, whether it’s to lose weight or improve your cardio fitness. Insights into your sleep, stress, fitness, and lifestyle will help optimize your overall heart health with long-term trends to see how building new habits will improve your daily heart rate metrics. Join the cardiogram community to find a new healthy habit or activity you’ll love!

Pulse Monitor & Heart Analyzer
• A digital diary of your heart rate data. Monitor your heart health and see how your pulse changes with interactive, instant heart rate graphs.
• Help you and your doctor track your heart health with a comprehensive breakdown of all your heart health data points with symptoms and mood logging
• Highlight and make notes on any section of your heart health data to identify what may have caused a spike or dip in your heart rate, like stress, diet, or medications.
• Compare your resting heart rate, steps, and sleep to other Cardiogram users.

Heart Health Report Card
• Track personalized risk scores to see how your heart health is changing over time and how different habits are affecting your risk for heart attacks and chronic disease.
• Compare your heart rate with past days and search through all your labeled data.
• Scores are generated by our clinically-validated ML algorithm using factors such as age, sex, height/weight, and various heart rate metrics.

WearOS watch app
• View your instant heart rate or track your daily heart rate through charts
• View your heart rate variability while working out
• Customize the frequency that Cardiogram measures your heart rate.

ECG and Sleep Tracking
Our app does not have built-in ECG / EKG functionality and does not measure individual heart rates. We retrieve sleep tracking data directly from the Google Fit, Fitbit, or Garmin Connect apps and show this information in the context of your heart rate. We don’t write any data to Google Fit yet, but stay tuned for updates.

Supported Languages
We currently only offer the app in English.

Supported devices with a heart rate monitor
-Fitbit Charge™ family
-Fitbit Versa™ family
-Fitbit Inspire HR™
-Fitbit Ionic
-Fitbit Alta HR
-Fossil Julianna HR, Fossil Carlyle HR, Fossil Sport, Fossil Venture HR, Fossil Explorist HR, Fossil Q series
-Garmin Fenix 5 Series
-Garmin Forerunner 35, 235, 645, 735XT, 935
-Garmin Vivoactive 3
-Huawei Watch 1 and 2
-LG Watch Sport
-Misfit Vapor
-Moto 360 Sport
-New Balance RunIQ
-Polar M600
-Ticwatch S, Ticwatch E, and Ticwatch Pro

Cardiogram is compatible with Wear OS by Google, Fitbit, and Garmin watches with a heart rate sensor. The Cardiogram Wear OS app on your watch works even if you use an iPhone. For Samsung, we are compatible with the 2021 Samsung Galaxy Watch 4 and Samsung Galaxy Watch 4 Classic only.
Updated on
Apr 22, 2022

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available

Ratings and reviews

6.92K reviews
rebecca nelson
February 5, 2022
Second review - The cardiogram began working again as it should. It lasted for 6 days this time. last night it stopped monitoring my rate every 3 minutes as scheduled, did not record my rate on the graph, or monitor my sleep. It isn't the watch. It's this app. It is inconsistent and not reliable. I have tried resetting the app, unfortunately that wasn't helpful either. You do not need a premium account in order for this to function properly. Please advise on how this issue can be fixed.
73 people found this review helpful
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Cardiogram, Inc.
February 2, 2022
Hi Rebecca, thanks for leaving us your feedback. I'm sorry you've had a rough experience -- that's definitely not how we want the app to work! There's a tight character limit on my reply, so I can't troubleshoot everything here, but if you send me an email at I'll look into the problem for you. Hoping to resolve it ASAP! - Pax
Heather Dunbar
February 11, 2020
I paid for the annual subscription during their flash sale in December. The features lasted maybe a month, then disappeared. I tried to contact their support and have heard nothing back since I sent the request two weeks ago. If you use this app, never upgrade, you won't get any of the extra features they advertise and no one will help if you have issues.
91 people found this review helpful
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Ralph Brown
April 19, 2020
This has been marginally useful in the past but now refuses to sync with my Fitbit Versa 2 despite disconnecting and reconnecting. The app has no trouble-shooting features and there is zero support from the company even if you pay for a subscription. Overall this is a pretty poorly written piece of software. The UI is opaque, once you sign up for Premium there's no way to check on your status, the sync function is very flaky. Overall a great idea with a lot of potential very badly implemented. NOT RECOMMENDED.
29 people found this review helpful
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Cardiogram, Inc.
April 20, 2020
Hi Ralph, I'm sorry to hear that you're having difficulty syncing your Fitbit with Cardiogram. I'd be happy to help you troubleshoot - you can reach me at If you have a moment, I'd appreciate if you could elaborate on what you mean by the UI being opaque? We're always trying to improve our implementation. Thanks! - Linda

What's new

WearOS changes:
* Updated tile design