Cardiogram: HR Monitor 4+

Heart Rate Monitor & Tracker

Nicolae Gherasim

Designed for iPad

    • £1.99



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

4.2 out of 5
9 Ratings

9 Ratings

XX Registered User XX ,

A great little app!

This is a super little app for those that don’t have (and don’t want) an Apple Watch… it does exactly what it says on the tin.

For me - being very privacy conscious - probably the single biggest benefit is that there’s no need to register or worry about having all your details harvested by some anonymous 3rd party and used for goodness knows what purposes.

Integrated seamlessly with my Coospo HW706 heart rate monitor (purchased in 2023) and Apple Health.

Yes I’d like a few more features (such as being able to add a custom workout type, for example) - but for the money I’m delighted.

Jopolski ,

Great app but

Great little app that helps me with monitoring my hr from chest sensor. There are few missing functions like adding notes or ability to select type of workout run, yoga, weights. I would like to be able to calculate calories and see battery level of my sensor. There are few bugs when changing screens. Overall great app and I can’t wait to see what future updates will bring.

Developer Response ,

Thank you for your review and. suggestions
We just updated the app, fixed the changing screen bug and optimized it for iOS 15. We already working to add notes for workouts and will soon come up with an update.

Googlefluff ,

Well worth the money.

This is a fabulous app. It synced with my CooSpo H6 Heart Rate Monitor (Chest Strap) Sensor with no problem via iPhone. When I posted a question re the app I received a prompt reply. You can’t get better than that.👏

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 based on, for example, 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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