Comparison

O2 vs Box Breathing

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

Head to head
About

O2

This app offers guided breathing exercises designed to enhance focus, reduce stress, or boost energy. Users can personalize their sessions with various themes, colors, and adjustable breath durations. It features three distinct breathing techniques to suit different needs.

Highlights
  • Focus, stress, calm, and energy exercises
  • Customizable themes and colors
  • Adjustable breath duration
  • Steady breathing technique
  • Triangle breathing technique
  • Box breathing technique
Features
Read full description

Beautiful breathing exercises for focus, stress, calm or energy. Customize your experience with different themes and colors. Change the breath duration and choose from 3 different exercises: - Steady breathing: in-and-out breathing - Triangle breathing: inhale, hold, exhale - Box breathing: inhale, hold, exhale, hold

About

Box Breathing

Enhance your well-being with guided breathwork exercises. This app offers personalized sessions based on a breathing test, with categories for calm, sleep, focus, and energy. Experience immersive audio, haptic feedback, and sound cues for stress reduction and improved performance.

Highlights
  • Personalized breathing test
  • Exercise categories (Calm, Sleep, Focus, Energize)
  • Audio guide and sound cues
  • Haptic feedback
  • CO2 tolerance test
  • Stress and anxiety relief
Features
Read full description

Unlock the power of breathwork and improve your physical and mental well-being with Float - the ultimate breathing app that makes it easy to breathe. Customize your experience with a breathing test and choose from exercise categories for calm, sleep, focus, quick relief, and energize. Used by top coaches and athletes, Float combines an audio guide, haptic feedback, and sound cues for a truly immersive breathing experience. Breathing is an essential practice for both your physical and mental well-being and Float is the ultimate breathing app that guides you through personalized breathing exercises to help you increase your performance throughout the day and reduce stress & anxiety. With Float, you can take a CO2 tolerance test, which gives us a reliable idea about your breathing in the last weeks and months. This test allows us to customize the breathwork to your very individual demands, ensuring you get the most out of each session. Whether you're an athlete or an office worker, practicing breathwork can be a powerful way to boost your health, and performance, control your nervous system and manage anxiety. Practicing breathwork is scientifically proven to increase your physical and mental performance. The benefits of learning to breathe with Float are endless, including relief from stress and anxiety, emotional healing, increased CO2 tolerance, improved immunity, and easier sleep. You'll also develop or increase self-awareness, enrich your creativity, improve focus and clarity, and boost your confidence and self-esteem. Breathwork with Float can also help you process emotions, heal emotional pain and trauma, and increase your CO2 tolerance. Additionally, it can help boost your immunity, fall asleep easily, enrich creativity, and improve focus, gain clarity and reduce brain fog. Float's breathwork exercises are curated by some of the top breathing coaches and are used by psychologists, physiotherapists, Olympic athletes, Navy SEALs, freedivers, yogis, and neuroscientists. We continue to work on expanding the breathwork exercises library to cover the most frequent stressful events occurring during the day. Breathing exercises are categorized into CALM, SLEEP, FOCUS, QUICK RELIEF, and ENERGIZE. The list of breathing exercises available in Float includes: – 4-7-8: Drift into sleep – Acumen: Get clarity, get focused – Alert: Get ready for action – Balance: Reconcile left & right brain – Box Breathing: Be right here, right now – Coherent: Stabilize your mood – Doping: Pre-workout routine – Ninja: Get calm like a ninja – Recovery: Cool down after a workout – Resonance: Sharpen your mind – Slumber: Sleep soundly – Sunrise: Rise & shine – Sunset: End the day in serenity – Unblock: Set your nose free – Wind Down: Take a moment to deeply relax – NSDR: Non-Sleep Deep Rest Please be aware that sessions can cause and are not limited to: – Tingling – Dizziness – Trembling, shaking, or other physical sensations – Emotional experiences – Experience energy moving through your body Got a question? Send us an email at team@keepfloating.com DISCLAIMER: This content in the Float app is not medical advice or a treatment plan and is intended for general education and demonstration purposes only. The content should not be used to self-diagnose or self-treat any health, medical, or physical condition. Don’t use this content to avoid going to your own healthcare professional or to replace the advice they give you. Consult with your healthcare professional before doing anything contained in this content. Links: Privacy Policy - https://www.keepfloating.com/privacy-policy Terms of Use - https://keepfloating.com/terms Instagram - https://www.instagram.com/float.breath TikTok - https://www.tiktok.com/@float.breath The Float app saves your meditation and sleep sessions to your Apple Health app.

Screenshots

O23 screens
Box Breathing4 screens

Verdict

The call

The clearest difference is ratings volume: Box Breathing at 318 against O2's 1. Box Breathing also leads on update cadence (every 3 weeks vs every 6 weeks). O2's advantage is rating (5.0 vs 4.8) and iOS requirement (14.0 vs 16.0). 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. O2 sells 1 one-off in-app purchase and Box Breathing sells 5 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

O2 holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Box Breathing has 318 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

O2 ships an update every 6 weeks, Box Breathing every 3 weeks. The most recent releases landed on October 2, 2026 and October 14, 2026 respectively.

Scorecard4 real differences · 6 level
O2 versus Box Breathing: the parameters behind the verdict, then further details
ParameterO2Box Breathing
PriceFreeFree
Rating5.0 (1 ratings) — better4.8 (318 ratings)
Positive reviews—78.6% of reviews
Number of ratings1318 — better
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, Vision Pro
Requires iOS14.0 — better16.0
Further details — not scored
Size1 MB96 MB
Age rating4+4+
DeveloperGootra, Inc.STRV s.r.o.

Customer experience

O2

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Box Breathing

All ratings318 ratings
Positive94.7%
Neutral1.9%
Negative3.5%
Written reviews42 reviews
Positive78.6%
Neutral2.4%
Negative19.0%

In-app purchases

1 purchases

O2

One-time1
  • Pro$0.99
5 purchases

Box Breathing

Subscriptions4
  • Float PRO - Monthly Membership$9.991 Month
  • Float PRO Breathing Exercises$39.991 Year
  • Float PRO Breathing Exercises$49.991 Year
Show 1 more
  • Float PRO Breathing Exercises7 Days trial$69.991 Year
One-time1
  • Float PRO Breathing Exercises$199.99

Questions

Is O2 free?
O2 is free to download, with in-app purchases available.
Is Box Breathing free?
Box Breathing is free to download, with in-app purchases available.
Which has better reviews, O2 or Box Breathing?
O2 is rated higher. O2 averages 5.0 out of 5 from 1 ratings, while Box Breathing averages 4.8 from 318 ratings.
Do O2 or Box Breathing have ads?
Neither O2 nor Box Breathing shows ads.
Which is updated more often, O2 or Box Breathing?
O2 ships an update every 6 weeks, and Box Breathing every 3 weeks. Most recently, O2 was updated on October 2, 2026 and Box Breathing on October 14, 2026.

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