HRV ‪+‬ 4+


Designed for iPhone

    • 3.3 • 12 Ratings
    • Free

iPhone Screenshots


Requires a Polar H6/H7/H10 HRM monitor, although it may work with other BLE Bluetooth HRM monitors.

Heart Rate Variability (HRV) is a great indicator of what is going on inside your body. It's a measurement of how well the mind can slow heart rate (HR), which is an indicator of overall health and stress. In general, better health is indicated using HRV when there is more variability from an in-breath (HR speeding up) to an out-breath (HR slowing down). A simple one-minute measurement each day can be enough to predict when it is time to take it easy, to avoid sickness or injury.

This application has some nice features like export RAW RR files for Kubios testing as well as unlimited time testing if you would like to perform other types of HRV tests. Additionally, you can export all data including RR files to DropBox.

What’s New

Version 2.9.2

We fixed a bug that had been created in 2.9.1 (the last version) that would not allow saving readings. We also temporarily removing user review popup until we can do more testing.

Ratings and Reviews

3.3 out of 5
12 Ratings

12 Ratings

BigGriz1 ,

Works well

This easily picked up my Polar Bluetooth sensor and provided my HRV.
I didn't know what the info meant, ie is a higher or lower number better (higher). A little coaching or info would give it 5 stars. Thanks

krispenhartung ,

Brilliantly simple

I’ve been searching for an HRV app like this for a long time with no success. This is exactly what I was looking for. All I wanted to do was to use my Polar H10 heart rate strap to measure my HRV and HR while I am sleeping. I don’t want any pep talks or recovery scores or anything like that, just the data — average HR, average HRV, average RMSSD. This is perfect! Thank you so much to the developer for creating this app. I’m not able to contact the developer here but my question is, I assume the HRV metric shown above RMSSD is SDNN?

Poiuytrewlkjm ,

It doesn’t work

I downloaded this app a while back and never worked

App Privacy

The developer, ZUZ LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

More By This Developer

You Might Also Like

Health & Fitness
Health & Fitness
Health & Fitness
Health & Fitness
Health & Fitness
Health & Fitness