O2CO2
ELIOTT ROMAIN-SAVARD Health & Fitness iPhoneiPadiPod touch
O2CO2 is a free Health & Fitness app for iPhone and iPad by ELIOTT ROMAIN-SAVARD. Requires iOS 15.1. Updated October 15, 2026.
- Price
- Free
- on the App Store
- Size
- 353 MB
- Age 4+
- Updated
- Oct 15
- 2026 · v1.4.0
Screenshots
About 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/
What’s new
Version 1.4.0 · Updated October 15, 2026
• 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.
App privacy
The developer, ELIOTT ROMAIN-SAVARD, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| O2CO2 | – | Free | October 15, 2026 | |
| WODzilla | – | Free | Oct 22, 2026 | Compare |
| Let's Laugh Laughter Exercises | 4.5 / 5 (8) | 1.99 USD | Jul 8, 2025 | Compare |
| Mama Care Hub | – | Free | Sep 24, 2026 | Compare |
| Gym L'Atelier - CrossFit 1966 | – | Free | Apr 18, 2026 | Compare |
| RepFit.io | 5.0 / 5 (3) | Free | Oct 16, 2026 | Compare |
| Omstars Yoga School | 3.9 / 5 (30) | Free | Aug 4, 2026 | Compare |
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