# O2CO2

> O2CO2 (iPhone/iPad app by ELIOTT ROMAIN-SAVARD.)

- Source: https://appshunter.io/ios/app/o2co2/id6813168268 (this page in markdown: same URL + `.md`)
- Developer: [ELIOTT ROMAIN-SAVARD](https://appshunter.io/developer/6813168270)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 353 MB
- Languages: American English, French (France)
- Released: 2026-09-22
- Data updated: 2026-10-24

## What is O2CO2?

Take a moment to breathe with O2CO2. Follow visual guides, sound cues and instructions in English or French to practise at your own pace.

START FOR FREE
• Cardiac Coherence in Balance mode: inhale for 5 seconds / exhale for 5 seconds, with adjustable session duration.
• Guided Breathing: 3 loops of 24 breaths, at Relax pace, with a male voice.
• Sound, music and volume choices in the included exercises.
• Share your results at the end of a Guided Breathing session.
• Exercise guides and access to the Masterclass, free for everyone.

EXPLORE MORE WITH PREMIUM
Both Premium plans include the same features:
• Six additional exercises: Box Breathing, Sleep Breathing, Strengthen, Breathing 1:2, Alternate Nostril Breathing and Bee Breathing.
• Every Guided Breathing setting: 1–15 loops or continuous mode, 8–96 breaths per loop, three paces, and male or female voice.
• Four Cardiac Coherence rhythms: Balance 5/5, Relaxing 4/6, Balance + 5.5/5.5 and Energizing 6/4.
• Guided Breathing session history and charts of your breath-hold times.

Choose an automatically renewing annual subscription or a one-time purchase for lifetime access. The applicable price is shown before confirmation in the App Store. Payment is charged to your Apple account after confirmation. The annual subscription renews automatically unless cancelled at least 24 hours before the current period ends. Manage or cancel it in your Apple account settings. Restore purchases from within the app.

PRACTISE AT YOUR OWN PACE
Read each exercise’s instructions before starting. Choose your sound settings and find them again the next time you open the app. No account registration or advertising. Settings and history are stored on your device, and you choose which results to share.

Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy policy: https://o2co2-confidentialite.eliott-romain.chatgpt.site/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| O2CO2 Premium Annual | $3.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| O2CO2 Premium Lifetime | $14.99 | one-time |


## Is O2CO2 safe?

Not enough ratings yet to assess O2CO2.

## Is O2CO2 legit?

O2CO2 has limited verification signals. The AppsHunter Legitimacy Score for O2CO2 is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.4.0 — 2026-10-15

• A clear comparison of Free and Premium access, with annual and lifetime plans.
• Six additional exercises with Premium: Box, Sleep, Strengthen, Breathing 1:2, Alternate Nostril and Bee.
• More rhythms: Box with 4, 6 or 8 seconds per phase; Sleep with 4/7/8 or 4/7/8/2; Strengthen with 4/4/6, 6/6/10 or 6/6/15.
• Breathing 1:2 with three levels and a progressive mode.
• Exercise guides in English and French, video links and direct access to the free Masterclass.
• New sound choices and saved exercise settings.
• Guided Breathing history and charts with Premium; free sharing at the end of a session.
• Annual subscribers can switch to lifetime access from the Premium screen, with a reminder to manage annual renewal separately with Apple.

### 1.3.0 — 2026-09-22

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-24.*