Comparison

HRV4Biofeedback vs Sounds True One

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HRV4Biofeedback

This app uses your phone's camera to measure heart rate variability and provide biofeedback. It guides you through deep breathing exercises to improve self-regulation and manage stress. Track your progress and explore correlations with your daily experiences.

Highlights
  • Camera-based HRV measurement
  • Real-time heart rate feedback
  • Resonant frequency analysis
  • Biofeedback score
  • Subjective annotations
  • HealthKit integration
  • Bluetooth sensor support
Features
Currently charting
Read full description

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 8 and onwards 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

About

Sounds True One

Explore spiritual growth and inner peace with a curated collection of premium shows, live sessions, and a supportive community. Access life-changing teachings from renowned wisdom teachers and resources to enrich your soul-filled life.

Highlights
  • Premium spiritual shows and docuseries
  • Online community and book clubs
  • Exclusive live sessions with teachers
  • Daily live classes (yoga, meditation)
  • Live evening relaxation sessions
  • On-the-go audio programs and meditations
  • Member discounts on courses and books
Features
Read full description

Sounds True One is your guide to navigating the depth, power, and joy of being human. With a world of spiritual exploration, premium shows, community, and special live events accessible from any device, we’ll be your trusted companion on the journey. Enjoy life-changing teachings, a variety of programs, and resources to support a soul-filled life. As a first-of-its-kind membership community and platform, Sounds True One offers unique learning opportunities with a wide range of wisdom teachers and best-selling authors, including Caroline Myss, Pema Chödrön, Jack Kornfield, Lama Rod, Adyashanti, Alice Walker, and many more. Morning and evening live sessions, paired with a library of captivating shows, programs, and docuseries make it easy to integrate spiritual practices into your day. You’ll always find just the right experience to meet you in the moment. Members also get a special discount and 20% off over 2,000 Sounds True online courses, audio products, and books from our 37 years of publishing. In just a few minutes a day, Sounds True One can help you feel more connected to yourself and the world around you. Download today and continue your journey inward. Sounds True One Membership Includes: Premium Shows & Docuseries Journey deep into the most prominent topics of spirituality and mindfulness with captivating original programming. Community Connect, engage and learn in a growing online community of people. Join book clubs, community challenges, daily reflections, and more. Exclusive Sessions Join member-only sessions with leading transformational teachers, spiritual leaders, and experts. Special Member Discounts Save an additional 20% on over 2,000 Sounds True online courses, audio products, and books. Daily Live Classes Start your day with positivity and intention. Choose from a range of classes including yoga, meditation, qigong, morning routines, and inspiration. Live Evening Sessions Rest, relax and find your center with yoga nidra, lucid dreaming, and energy healing. and more. Member-only App Access hundreds of on-the-go audio programs and meditations designed to guide and support your inner growth on your time. Featured Specials Enjoy exclusive, members-only weekly and monthly specials exploring a range of transformational topics Terms of Use: https://product.soundstrue.com/terms-and-conditions/ Privacy Policy: https://product.soundstrue.com/privacy-policy/ Customer Support: membership@soundstrue.com

Screenshots

HRV4Biofeedback4 screens
Sounds True One4 screens

Verdict

The call

The clearest difference is price: Sounds True One at Free against HRV4Biofeedback's $9.99. Sounds True One also leads on rating (4.6 vs 3.4) and ratings volume (1.2K vs 29). HRV4Biofeedback's advantage is in-app purchases (none vs 4) and review sentiment (53% vs 26%). On update cadence, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Sounds True One is free to download; HRV4Biofeedback costs $9.99 up front. Sounds True One sells 4 in-app purchases, starting at $19.99 per month. HRV4Biofeedback asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sounds True One holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: Sounds True One has 1.2K ratings behind it against 29, so its average is the more settled of the two. Written reviews complicate that: 53% of HRV4Biofeedback's written reviews are positive against 26% of Sounds True One's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 25, 2026.

Scorecard7 real differences · 4 level
HRV4Biofeedback versus Sounds True One: the parameters behind the verdict, then further details
ParameterHRV4BiofeedbackSounds True One
Price$9.99Free — better
Rating3.4 (29 ratings)4.6 (1.2K ratings) — better
Positive reviews53.1% of reviews — better25.7% of reviews
Number of ratings291.2K — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#51 — better—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.615.5 — better
Further details — not scored
Size138 MB162 MB
Age rating4+12+
DeveloperA.S.M.A. B.V.Sounds True

Customer experience

HRV4Biofeedback

All ratings29 ratings
Positive51.7%
Neutral20.7%
Negative27.6%
Written reviews32 reviews
Positive53.1%
Neutral15.6%
Negative31.3%

Sounds True One

All ratings1,208 ratings
Positive90.1%
Neutral1.8%
Negative8.0%
Written reviews105 reviews
Positive25.7%
Neutral12.4%
Negative61.9%

Bugs and requests

HRV4Biofeedback

Not enough reviews yet to summarise bugs or requests.

Sounds True One

Reported bugs

3 issues
  • Unable to access purchased courses
  • App freezes and becomes unresponsive
  • Inconsistent login and password issues

Requested features

4 requests
  • Add search functionality to easily find content
  • Allow background audio playback when app is closed
  • Improve offline access to purchased content
  • Provide better integration between app and website

In-app purchases

None

HRV4Biofeedback

No in-app purchases

4 purchases

Sounds True One

Subscriptions4
  • Monthly All Access$19.991 Month
  • Monthly7 Days trial$19.991 Month
  • Annual7 Days trial$179.991 Year
Show 1 more
  • Yearly All Access$189.001 Year

Questions

Is HRV4Biofeedback free?
HRV4Biofeedback costs $9.99, with no in-app purchases.
Is Sounds True One free?
Sounds True One is free to download, with in-app purchases available.
Which has better reviews, HRV4Biofeedback or Sounds True One?
Sounds True One is rated higher. HRV4Biofeedback averages 3.4 out of 5 from 29 ratings, while Sounds True One averages 4.6 from 1.2K ratings.
Do HRV4Biofeedback or Sounds True One have ads?
Neither HRV4Biofeedback nor Sounds True One shows ads.
Which is updated more often, HRV4Biofeedback or Sounds True One?
HRV4Biofeedback ships an update every 2 months, and Sounds True One every 2 months. Most recently, HRV4Biofeedback was updated on October 25, 2026 and Sounds True One on October 25, 2026.

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