iPhone Screenshots


Cardiogram is a modern reliable tool 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!

No personal data is sent to our servers, no account or login required, all the information is stored directly on your iPhone and Apple Health app only.
The app is integrated with Apple HealthKit to synchronize and record heart-rate data.
No location services are used or 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 sensor (Polar OH1, H10, and H7) with excellent and consistent performance results.

We recommend using Cardiogram paired with:
Xiaomi Mi Band 3
Xiaomi Mi Band 4
Polar OH1, H10, and H7
Cardiosport TP3
R1 Blue Sigma Sport

The app relies on a medical algorithm to automatically calculate heart rate limits.
The app 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.
Sessions are automatically saved even when the sensor runs out of battery, to prevent data from being lost.

Colour coded visual information during the workouts:
– Light green: Fitness Zone (50 to 60% of 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 the metabolism all benefit equally.
– Yellow: Anaerobic zone (80 to 90% of 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 4.4

You can now measure resting heart rate (RHR) using Polar (BLE) or Mi Band sensors. Just long tap the start button, stay relaxed, and wait for the app to finish.
Listen to our users, and we now display the name of the HR device connected to the app.
Chart improvements for better readings understanding. Code optimization which lowers energy consumption.
Few bugs fixed and performance improvements.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

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 contact@mindeon.com 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.


Nicolae Gherasim
10.2 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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