Comparison

BellyBio Interactive Breathing vs Yudemon HRV

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

Head to head
About

BellyBio Interactive Breathing

This app uses your iPhone's sensors to create a biofeedback experience synchronized with deep abdominal breathing. It generates music and light patterns that respond to your breath, making relaxation more engaging and measurable. Designed for those already proficient in belly breathing.

Highlights
  • Interactive musical themes synchronized with breathing
  • Audio stress-level feedback
  • Breathing color synchronization
  • Real-time breathing and stress graphs
  • Breathing and stress logs
  • 3D Earth animation of users
Features
Read full description

Put the iPhone on your stomach. Breathe deeply. Enjoy... FOR ADVANCED BELLY-BREATHERS ONLY BellyBio (Belly Biofeedback) is a triple innovation in deep abdominal breathing, biofeedback and music: 1 – DEEP BREATHING GETS ADDICTIVE BellyBio generates beautiful music & light perfectly synchronized to your deep abdominal breathing movements, making deep breathing more pleasant and rewarding than ever. You're going to love playing with your inner balloon. 2 – BIOFEEDBACK GETS SIMPLE BellyBio turns your iPhone/iPod Touch into a highly-sensitive deep breathing sensor providing a real-time, objective stress-level index based on your breathing pattern. Biofeedback thus becomes more simple and powerful --not to mention affordable-- than ever, so you can now know for sure who's the coolest dude in the neighborhood. 3 – MUSIC GETS BREATHABLE The first "Abdominal Music Player", BellyBio makes music play in sync with your breathing, which in return makes your breathing calm down. Is it you who follow the music or the music that follows you? You don't listen to music anymore, you merge with it. IMPORTANT NOTICE -- Practicing BellyBio will require you to: a) BE ABLE TO NATURALLY BREATHE DEEPLY AND SLOWLY FROM YOUR BELLY, meaning your belly --and not your chest-- must significantly and effortlessly inflate when you inhale and deflate when you exhale. If you can't, you'd probably better not download this app since nothing is more annoying and ineffective than struggling to achieve deep abdominal breathing (and by the way this will perhaps avoid somewhat angry customer ratings... ;-)) b) PROPERLY POSITION THE iPHONE ON YOUR PELVIS, FACE UP, SO AS TO MAKE IT TILT BACK & FORTH when you breathe deeply in & out from your belly (BellyBio measures the increase/decrease of the angle between the iPhone and your body). The bottom of the iPhone should rest still on your pelvis while the top moves up and down with your lower belly as you breathe in & out. WATCH THE IN-APP DEMO to see how it works (www.youtube.com/bellybio). The app is quite heavy (170 Mo) due to the multiformat music base. Wifi is required to download it. ========== FEATURES - Several interactive musical themes you can breathe deeply in and out (i.e. have BellyBio play in sync with your deep abdominal breathing) - One of those themes (“Calmitude pitch”) provides you with a direct audio stress-level feedback through the pitch of the inhaling tone (the lower the stress, the lower the pitch) - Choice of breathing colors displayed in sync with each in- and out-breath - Graph showing real-time breathing and stress curves - Log (date, duration of use, minimum stress, minimum breathrate, Qi production) - 3D-earth animation showing all BellyBio users on the planet - Whether you have an iPhone or an iPod Touch, the main home button must always be close to your lap, not to your chest. - Child-proof (successfully tested on 5-year-old with adult assistance) QUOTES (sort of) - "All thumbs and navels up!!!" (Buddha, India) - "BellyBio rests on the belly just like the leaf floats on the sea." (Lao Tzu, China) - "Bellissimo BellyBio!" (L. Da Vinci, Italy) - "To breathe or not to breathe? To breathe, period. With BellyBio!" (W. Shakespeare, UK) - "I play BellyBio, therefore I stop thinking, therefore I am." (R. Descartes, France) - "So cool!" (I. Newton, UK) - "Makes me wanna compose a dozen sonatas and concertos for BellyBio! Please give me 10 minutes." (W. A. Mozart, Austria) - "Even with only one ear, this thing just blew my mind!" (V. Van Gogh, Netherlands) - "Undoubtedly absolute." (A. Einstein, Germany) - "Why didn't they call it iBelly?" (S. Jobs, USA) WARNING This application is not meant to substitute for medical diagnosis and/or treatment. Should you feel any pain or discomfort, please stop immediately and consult your physician or health professional.

About

Yudemon HRV

Enhance stress resilience and self-regulation with this visual and sonic tool for resonance breathing and HRV biofeedback. Connect a heart rate monitor for advanced analytics and personalized training journeys. Enjoy dynamic visuals and custom soundscapes designed to optimize your practice.

Highlights
  • Resonance breathing timer
  • HRV biofeedback training
  • ECG heart rate monitor integration
  • Journey Mode for optimal breathing rate
  • Customizable visuals and soundscapes
  • Heartwork generative art based on data
Features
Read full description

Yudemon HRV is a unique visual and sonic tool for resonance breathing and HRV biofeedback training. It provides a fun and engaging workout for your autonomic nervous system, helping you build stress resilience and enhanced self-regulation. You can either use the app as a basic breath timer, or connect an ECG-based heart rate monitor (like the Polar H10) via Bluetooth for full biofeedback and analytics. Unless you specifically opt-in to cloud sync, all data processing happens on your device, so your data is completely secure. Using Yudemon with a heart rate monitor not only allows you to track and visualise your data for each session, it also enables you to use Yudemon's Journey Mode, a novel and unique way of establishing your own optimal breathing rate over the course of multiple sessions. Yudemon's adjustable visuals and soundscapes offer infinite variations, making every breathing session feel fresh and engaging. By default, the app’s appearance automatically changes on a daily basis. Or, with Yudemon Pro, you can take full control and customize everything manually. A healthy heart does not beat like a metronome but constantly adapts to the requirements of the present moment. Heart rate variability (HRV) biofeedback training and resonance breathing are based on the fact that our breathing has a direct impact on the rest of our physiology. By controlling our breathing in specific ways we can train our body to become more adaptable and perform better under stress. Yudemon helps you with this practice. Yudemon HRV is the first breathing app with custom soundsapes and functional music specifically designed for resonance breathing and HRV biofeedback training. The soundscapes guide you in your breathing sessions and aim to enhance the effects of the practice. It also integrates other aspects of generative art, such as the "Heartwork", a unique piece of art based on your very own physiological data that is generated and grows with you as you complete more sessions. New visuals, soundscapes, and effects are added on a regular basis. Terms of Service: https://app.yudemon.com/terms Privacy Policy: https://app.yudemon.com/privacy

Screenshots

BellyBio Interactive Breathing4 screens
Yudemon HRV4 screens

Verdict

The call

The clearest difference is rating: Yudemon HRV at 4.5 against BellyBio Interactive Breathing's 4.0. Yudemon HRV also leads on update cadence (every 2 days vs every 3 months) and review sentiment (92% vs 68%). BellyBio Interactive Breathing's advantage is ratings volume (40 vs 13) and iOS requirement (7.0 vs 15.0). On price, ads, in-app purchases and monetization model 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

Both are free to download. BellyBio Interactive Breathing sells 4 one-off in-app purchases and Yudemon HRV sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Yudemon HRV holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 40 and 13 respectively. Written reviews point the same way: 68% of BellyBio Interactive Breathing's written reviews are positive against 92% of Yudemon HRV's.

UpkeepUpdate frequency

BellyBio Interactive Breathing ships an update every 3 months, Yudemon HRV every 2 days. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.

Scorecard5 real differences · 5 level
BellyBio Interactive Breathing versus Yudemon HRV: the parameters behind the verdict, then further details
ParameterBellyBio Interactive BreathingYudemon HRV
PriceFreeFree
Rating4.0 (40 ratings)4.5 (13 ratings) — better
Positive reviews68.0% of reviews91.7% of reviews — better
Number of ratings40 — better13
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS7.0 — better15.0
Further details — not scored
Size201 MB163 MB
Age rating4+4+
DeveloperRelaxLineYudemon LLC

Customer experience

BellyBio Interactive Breathing

All ratings40 ratings
Positive72.5%
Neutral2.5%
Negative25.0%
Written reviews75 reviews
Positive68.0%
Neutral5.3%
Negative26.7%

Yudemon HRV

All ratings13 ratings
Positive84.6%
Neutral15.4%
Negative0.0%
Written reviews12 reviews
Positive91.7%
Neutral0.0%
Negative8.3%

Bugs and requests

BellyBio Interactive Breathing

Reported bugs

25 issues
  • Keeps saying irregular breathing
  • Shuts off repeatedly
  • Won't stay open
  • Fails almost every effort
  • Audio doesn't work
Show 20 more
  • No sound or color changes with iOS
  • App doesn't work with iOS 8
  • Stuck on intro screen
  • App won't open on new phone
  • Doesn't work with iPhone 6
  • App stopped working 4 months ago
  • Downloaded but non-operable
  • Non-working app
  • App no longer works on new iOS versions
  • App opens to title screen and freezes
  • Demo button doesn't demonstrate
  • Irregular pattern message persists
  • Crashing issues
  • Glitch-infested
  • UI isn't welcoming
  • Audio hasn't been playing after iOS update
  • Can't go back to old breathing sessions
  • Current session graph turns red
  • Keeps kicking me off
  • Crashes iPad

Requested features

12 requests
  • Update for newer iOS versions
  • More song tracks
  • Ability to view past log entries
  • More sleek design
  • More music/ambiance selections
Show 7 more
  • Longer sessions
  • Option for just wave sounds
  • New icon
  • Timer on the app
  • Mode to teach beginners
  • Guided breathing from start rate to therapeutic zone
  • Chat feature

Yudemon HRV

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

BellyBio Interactive Breathing

One-time4
  • Angels Club$0.99
  • Brownian Dream$0.99
  • Metronomia$0.99
Show 1 more
  • Highlands$0.99
4 purchases

Yudemon HRV

Subscriptions4
  • Yudemon Pro (Monthly)$2.991 Month
  • Yudemon Pro (Monthly)$4.991 Month
  • Yudemon Pro (Yearly)$19.991 Year
Show 1 more
  • Yudemon Pro (Yearly)$29.991 Year

Questions

Is BellyBio Interactive Breathing free?
BellyBio Interactive Breathing is free to download, with in-app purchases available.
Is Yudemon HRV free?
Yudemon HRV is free to download, with in-app purchases available.
Which has better reviews, BellyBio Interactive Breathing or Yudemon HRV?
Yudemon HRV is rated higher. BellyBio Interactive Breathing averages 4.0 out of 5 from 40 ratings, while Yudemon HRV averages 4.5 from 13 ratings.
Do BellyBio Interactive Breathing or Yudemon HRV have ads?
Neither BellyBio Interactive Breathing nor Yudemon HRV shows ads.
Which is updated more often, BellyBio Interactive Breathing or Yudemon HRV?
BellyBio Interactive Breathing ships an update every 3 months, and Yudemon HRV every 2 days. Most recently, BellyBio Interactive Breathing was updated on October 16, 2026 and Yudemon HRV on October 13, 2026.

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