# O2 — Breath Hold Apnea Trainer

> Freediving, Breathwork & Sleep

Canonical page: [https://chrome-stats.com/d/id6757519007](https://chrome-stats.com/d/id6757519007)

## Overview

- **ID:** `id6757519007`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Denis Tronin
- **Category:** Health & Fitness
- **Version:** 1.13
- **Last updated:** 2026-09-01
- **First published:** 2026-01-12
- **Size:** 2.19 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/o2-breath-hold-apnea-trainer/id6757519007)
- **Website:** [https://truebloom.ltd](https://truebloom.ltd/)
- **Privacy policy:** [https://drive.google.com/file/d/1gE057dwXaKW\_mH2xRwB\_\_yTFdwj\_I2zq/view?usp=sharing](https://drive.google.com/file/d/1gE057dwXaKW_mH2xRwB__yTFdwj_I2zq/view?usp=sharing)

## Description

Breath-hold tables for freedivers + guided breathing for stress and sleep. New: Holotropic Breathing. One-time purchase, no subscription.

Train your breath like a professional freediver.

O2 is a science-based breath-hold training app that helps you extend your breath-hold time, build CO₂ tolerance, and improve mental focus through progressive training protocols.

PROVEN TRAINING METHODS
• CO₂ Tables — Build carbon dioxide tolerance with decreasing rest intervals
• O₂ Tables — Extend breath-hold capacity with increasing hold times
• Box Breathing — The 4-4-4-4 technique for stress relief and focus
• Progressive difficulty levels from beginner to advanced

BUILT FOR PERFORMANCE
• Designed for freedivers, spearfishers, swimmers, surfers, and athletes
• Used by professionals to prepare for competition and improve underwater performance
• Backed by established breath-hold training science

SMART TRAINING EXPERIENCE
• Haptic feedback guides you through each phase without looking at the screen
• Voice cues announce hold and breathe phases
• Visual timer with clear phase indicators
• Track your progress with detailed statistics

HEALTH INTEGRATION
• Sync workouts to Apple Health
• Track your training consistency
• Monitor progress over time

SIMPLE & FOCUSED
• Clean, distraction-free interface
• No subscriptions — one-time purchase unlocks everything forever
• Works offline, anywhere
• Family Sharing supported

Whether you're training for freediving competitions, improving your surf hold-downs, or simply want to experience the mental clarity that comes with breath control — O2 gives you the tools to progress safely and effectively.

Start your breath-hold journey today.

## Rankings

- #1,584,153 — Overall

## Similar extensions and apps

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- [Apnea Tables Freediving Coach](https://chrome-stats.com/d/id1116159086) — 3.90 / 5
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Source: [Chrome-Stats](https://chrome-stats.com/d/id6757519007)