HRV4Biofeedback 4+

Camera-based biofeedback app

A.S.M.A. B.V.

    • $9.99

iPhone Screenshots


Improve self-regulation and better cope with stress using HRV4Biofeedback, the camera-based Heart Rate Variability (HRV) Biofeedback app

> camera-based biofeedback measurement showing real-time heart rate
> spot check measurements at rest
> frequency power spectrum
> biofeedback score to quantify the effectiveness of the practice in terms of deep breathing and duration
> resonant frequency analysis to determine the optimal breathing rate for your sessions
> semi-real time HRV analysis
> alternative manual breathing rate configuration between 4.5 and 8.5 breaths / minute
> subjective annotations, including up to 5 personalized questions
> current streak
> explore correlations between subjective annotations and biofeedback data
> Integration with HealthKit (you can write heart rate, HRV and Mindful minutes)
> weekly and monthly summaries
> support for Bluetooth sensors
> background nature sounds
> vibration to guide you through the practice

Heart Rate Variability (HRV) Biofeedback is a technique that can directly affect physiological and psychological factors through deep breathing exercises and is an ideal strategy to help us self-regulate and better cope with stressful situations​

Practically speaking, HRV Biofeedback consists of providing an individual with real-time feedback on instantaneous heart rate and respiration changes while being instructed to breathe at low frequencies

You can learn more about the psychological and physiological benefits of deep breathing and HRV Biofeedback, at

Life can be demanding, from both a physical and psychological point of view

​Our health and performance can be affected by how we are able to effectively cope with stressful situations and deal with anxiety, or in broader terms, our ability to emotionally self-regulate is key

The goal of HRV Biofeedback is to improve self-regulation, therefore impacting positively our health and performance

- App features:
- An introduction to biofeedback:
- How to use the camera measurement:

Supported devices for the camera measurement: iPhones 6, 6S, 6+, 6S+, SE, 7, 7+, 8, 8+, X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12 mini, 12, 12 Pro, 12 Pro Max, 13 mini, 13, 13 Pro, 13 Pro Max

Currently unsupported devices for the camera measurement: iPhones 4S, 5, iPads and iPods - These devices require a bluetooth sensor

HRV4Biofeedback requires to register an account with your email address, so that your data can be backed up safely and retrieved in case anything happens (app issue, changing phone, etc.)

The validation of the camera-based heart rate measurement is available here:

What’s New

Version 1.3.5

* resolved an issue that caused spot check measurements not to be saved under certain circumstances

If you have a minute for a positive review, that is much appreciated. Feel free to reach me at @altini_marco on Twitter for any issues, questions or feedback. Thank you for your support


Ratings and Reviews

3.9 out of 5
19 Ratings

19 Ratings

Sebastianrenix ,

Great for what it does, want it to do more

I doubted their claim of HRV and HR accuracy. I have a Polar h10 and I compared measurements and to my surprise HRV4BIOFEEDBACK optical sensor accuracy was the same as Polar! Very impressive.

I like how you get the scores and can see the effects on mood and whatnot. Helpful to see trends over time.

Major criticism is that the breathing visual is hard to see. They need to do something with more contrast.

Only rated 4 stars because there is so much more they could do with the biofeedback exercise rather than just breathing. Guided meditation, sound, etc.

XLT10 ,

Useful but can improve

Loved hrv4training so tried this also and because the developers are expert in this field. App uses a dark to light screen change that you follow to pace breathing. The dark/light lighting is not markedly different and difficult to follow. Would suggest greater dark/light difference or a bold white line or circle like “ibreathe”. Would also be very useful to have a sound or chime cue so one could close eyes during the practice and still maintain breathing pace. It would be useful to see the HRV numbers that underly the buofeedback score. I think app will become more useful with subsequent iterations and updates.

Developer Response ,

Thank you for your feedback and continued support, really appreciate it. Just a quick suggestion in terms of using the app with eyes closed, you can do so by enabling the vibration, from Menu / Settings. Take care!

smith.forrest ,

Amazing results!

This is the single most impactful app I’ve found for getting myself to center and feeling more in the “flow” state in a super short time. Replacing/supplementing my normal meditation time and the impact is amazing. There are a couple of small things I’d change on the app, but the team that makes it is awesome so I’m sure they’ll nail this; I have been using their other app (HRV4Training)and it launches new features and great updates all the time so I’m looking forward to where they go with this.

App Privacy

The developer, A.S.M.A. B.V., 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 Linked to You

The following data may be collected and linked to your identity:

  • Sensitive Info

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Contact Info
  • Diagnostics

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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