Comparison

BellyBio Interactive Breathing vs Breathe2Relax

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

Breathe2Relax

Learn diaphragmatic breathing for stress management. This app offers detailed information on stress's effects and guided exercises to improve mood, control anger, and manage anxiety. It integrates with Apple Watch to track heart rate during sessions.

Highlights
  • Stress management information
  • Diaphragmatic breathing exercises
  • Mood stabilization
  • Anger control
  • Anxiety management
  • Heart rate tracking with Apple Watch
Features
Read full description

Breathe2Relax is a portable stress management tool which provides detailed information on the effects of stress on the body and instructions and practice exercises to help users learn the stress management skill called diaphragmatic breathing.Breathing exercises have been documented to decrease the body’s ‘fight-or-flight’ (stress) response, and help with mood stabilization, anger control, and anxiety management. Breathe2Relax can be used as a stand-alone stress reduction tool, or can be used in tandem with clinical care directed by a healthcare worker. Breathe2Relax now uses HealthKit and your Apple Watch device to measure your heart rate throughout your breathing exercise to help provide an even more complete picture of the relaxation experienced.

Screenshots

BellyBio Interactive Breathing4 screens
Breathe2Relax4 screens

Verdict

The call

The clearest difference is in-app purchases: Breathe2Relax at none against BellyBio Interactive Breathing's 4. Breathe2Relax also leads on rating (4.2 vs 4.0) and ratings volume (316 vs 40). BellyBio Interactive Breathing's advantage is update cadence (every 3 months vs every 24 months) and iOS requirement (7.0 vs 15.0). On price, ads and device support 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. Breathe2Relax asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Breathe2Relax holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Breathe2Relax has 316 ratings behind it against 40, so its average is the more settled of the two. Written reviews point the same way: 68% of BellyBio Interactive Breathing's written reviews are positive against 78% of Breathe2Relax's.

UpkeepUpdate frequency

BellyBio Interactive Breathing ships an update every 3 months, Breathe2Relax every 24 months. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

Scorecard7 real differences · 3 level
BellyBio Interactive Breathing versus Breathe2Relax: the parameters behind the verdict, then further details
ParameterBellyBio Interactive BreathingBreathe2Relax
PriceFreeFree
Rating4.0 (40 ratings)4.2 (316 ratings) — better
Positive reviews68.0% of reviews77.9% of reviews — better
Number of ratings40316 — better
Update frequencyEvery 3 months — betterEvery 24 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS7.0 — better15.0
Further details — not scored
Size201 MB117 MB
Age rating4+4+
DeveloperRelaxLineDefense Health Agency

Customer experience

BellyBio Interactive Breathing

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

Breathe2Relax

All ratings316 ratings
Positive81.0%
Neutral6.6%
Negative12.3%
Written reviews199 reviews
Positive77.9%
Neutral7.0%
Negative15.1%

User reviews

BellyBio Interactive Breathing

From 40 App Store ratings

What we love

  • 👍 Highly recommended by professionals
  • 💡 Quantifiable breathing data
  • 💡 Innovative breathing tracking
  • 💡 Free and valuable
  • 👍 Long-time user satisfaction

Room to improve

  • 🐛 Irregular breathing detection issues
  • 🐛 App shuts off frequently
  • 🐛 Won't stay open
  • 🐛 Fails most attempts
  • 🐛 Audio doesn't work

Breathe2Relax

From 316 App Store ratings

What we love

  • 🌟 Excellent for stress and anxiety relief
  • 👍 Simple and easy to use
  • 🧘‍♀️ Helps with breathing and relaxation
  • 🤩 Calming and soothing experience
  • 💤 Useful for sleep and sleep issues

Room to improve

  • 🐛 Connectivity issues, unable to stream videos
  • 🔇 Lack of audio/sound options
  • ⏱️ Limited breathing cycle duration
  • 📱 Compatibility issues with older devices
  • 🤖 Monotonous voice instructions

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

Breathe2Relax

Reported bugs

3 issues
  • Videos not playing due to connectivity issues
  • App crashing or freezing on some devices
  • Inability to connect to Apple Watch

Requested features

5 requests
  • Ability to set custom breathing cycle duration
  • More background music/nature sound options
  • Different voice options for guidance
  • Integration with Apple Watch/fitness tracking
  • Longer breathing sessions beyond 16 cycles

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
None

Breathe2Relax

No in-app purchases

Questions

Is BellyBio Interactive Breathing free?
BellyBio Interactive Breathing is free to download, with in-app purchases available.
Is Breathe2Relax free?
Breathe2Relax is free to download, with no in-app purchases.
Which has better reviews, BellyBio Interactive Breathing or Breathe2Relax?
Breathe2Relax is rated higher. BellyBio Interactive Breathing averages 4.0 out of 5 from 40 ratings, while Breathe2Relax averages 4.2 from 316 ratings.
Do BellyBio Interactive Breathing or Breathe2Relax have ads?
Neither BellyBio Interactive Breathing nor Breathe2Relax shows ads.
Which is updated more often, BellyBio Interactive Breathing or Breathe2Relax?
BellyBio Interactive Breathing ships an update every 3 months, and Breathe2Relax every 24 months. Most recently, BellyBio Interactive Breathing was updated on October 16, 2026 and Breathe2Relax on October 15, 2026.

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