Cardiogram: HR Monitor 4+

Heart Rate Monitor & Tracker

Nicolae Gherasim

Designed for iPad

    • $2.49



This app provides a minimalist way to monitor your heart health using modern Bluetooth BLE sensors. It respects your privacy by not requiring an account.

Cardiogram is a modern minimalistic, reliable app that will help accurately monitor and record your heart rate in real-time to help keep track of your health and performance. Just power on your sensor and start the app - it’s that easy!

Cardiogram is one of the few apps that do not require you to create an account, all information is stored locally and thereby protected from any data leaks or privacy scandals. No personal data is sent to any servers, all the information is stored directly on your iPhone and Apple Health app only.

The app is integrated with Apple HealthKit to sync and record heart-rate data.

Notable features:
- full control over your data
- synchronise with Apple Health
- record your workouts (walking, running, cycling)
- no location services are used or required
- very low energy consumption
- no account is required

You can monitor and record your cardiac rhythm in a range of situations:

- During the day to detect heart rate anomalies;
- During sleep;
- During your preferred fitness workouts or cardio exercises;
- As a way of measuring stress or anxiety levels by measuring resting heart rate;

Cardiogram is compatible with a range of modern heart rate monitors with Bluetooth 4.0 (Smart or LE) available on the market.
The app has been tested using multiple heart sensors, including Polar sensors (Polar OH1, H10, and H7) with excellent and consistent performance results.

We recommend using Cardiogram app paired with:
Garmin HRM-Dual or Garmin HRM-Pro
Polar OH1, H10, and H7
Cardiosport TP3
R1 Blue Sigma Sport
CooSpo heart rate monitors

The app relies on a medical algorithm to automatically calculate heart rate limits and will display a warning signal when the maximum heart rate limit is reached.
Every session is recorded and can be viewed later in simple and easy to understand graph charts.
To reduce history view cluttering the app save only the sessions longer than 2 minutes. So, if you want to check your heart rate for a few seconds, you can do that, but will not be recorded in the history database.

Colour coded visual information during the workouts:
– Light green: Fitness Zone (50 to 60% maximum heart rate). Workouts in this zone target the cardiovascular system, making them a particularly good choice for fitness newbies.
– Green: Fat-Burning and Aerobic Zone (60 to 80% of maximum heart rate). If you’re in the aerobic training zone, you’ll feel like you’re working hard but could still dig a little deeper. The body fuels the workout by burning carbohydrates and fats. The cardiovascular system, the lungs, and metabolism all benefit equally.
– Yellow: Anaerobic zone (80 to 90% maximum heart rate). Workouts in the anaerobic zone are particularly good for building muscles (for weightlifters) and boosting performance (for endurance athletes). Interval training involves spending short periods in the anaerobic zone.
– Red: close to maximum heart rate for the user age (over 90% from the maximum hr). A heart rate in this zone can be very dangerous! Experienced competitive athletes do short intervals of training at this energy-sapping intensity under professional supervision to refine their performance shortly before a big event.


What’s New

Version 8.5

Cardiogram HR Monitor - Your Simplified Heart Rate Tracker!
New: Measure resting heart rate with a long tap on Start.
Added support for CooSpo HW706 Armband Heart Rate Monitor.
Improved energy efficiency for minimal battery impact.
Introducing a home screen widget for iOS 16+ users.
Track various workouts effortlessly: walking, running, cycling, hiking, skating.
Seamlessly sync data with Apple Health for a complete wellness overview.
No mandatory account creation or reliance on location services.
Optimized for the latest iOS release.

DISCLAIMER: This app does not provide medical diagnoses or treatments. Consult a healthcare professional before making any medical decisions based on app records.

Ratings and Reviews

3.8 out of 5
4 Ratings

4 Ratings


Simple, uncomplicated HR monitor

I love the simplicity of this app! Nothing being uploaded to 3rd party servers, no ads, and pairs up with Garmin HRM’s (I’ve used HRM-Pro, HRM-Dual).
There are some features I’d like to see but then that would add complexity to a wonderfully simple app.

Developer Response ,

Thanks so much for your review, we’re glad you’re enjoying the app!

If you have any suggestions or feedback on how to improve Cardiogram, feel free to email us at 👌

rockrefund ,

Frustrating experience , refund plz

No prompt to sync, support page points to twitter 💁

Developer Response ,


Sorry to hear that you cannot use our app. Please drop us an email at with your heart rate device/sensor type and will do our best to help you.
We have no control over the refund, please use the App Store to ask for a refund.

Thank you

thomasdmiller ,

Frustrating .. caution

There’s no real channel for support. Would not recognize attached polar hr device. Nothing on support site trouble shooting. No clear path to contact dev. Reboots, restarts, repairing BT device. Wasted too much time already. 2 bucks total toilet flush.

Developer Response ,

Sorry to hear that you had troubles. Please let me know what Polar sensor did you have ?
With Polar sensors the app works pretty straight forward: start the sensor, make sure you don’t have it connected with another app and press Start. Also it might help if you update the sensor firmware to the latest version. You can find informations about how to do that in your Polar app.

App Privacy

The developer, Nicolae Gherasim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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