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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods

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

APP FEATURES:
> 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

WHAT'S BIOFEEDBACK?
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 HRV4Biofeedback.com

HOW CAN I BENEFIT FROM BIOFEEDBACK?
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

LEARN MORE:
- App features: https://www.hrv4biofeedback.com/faq.html
- An introduction to biofeedback: https://www.hrv4biofeedback.com/blog/a-primer-on-heart-rate-variability-biofeedback
- How to use the camera measurement: https://www.hrv4biofeedback.com/blog/guidelines-and-best-practices-for-camera-based-measurements

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: https://www.researchgate.net/publication/315059917_Comparison_of_Heart_Rate_Variability_Recording_With_Smart_Phone_Photoplethysmographic_Polar_H7_Chest_Strap_and_Electrocardiogram_Methods