# H2O Breath Hold Trainer — Increase lung capacity! > App for building CO2 tolerance and increasing lung capacity through breath training. (iPhone/iPad app by Guillermo Mondet.) - Source: https://appshunter.io/ios/app/h2o-breath-hold-trainer/id6501970723 (this page in markdown: same URL + `.md`) - Developer: [Guillermo Mondet](https://appshunter.io/developer/1744074071) - Category: Health & Fitness - Price: Free with in-app purchases - Rating: 5.00/5 from 16 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 192 MB - Languages: American English - Released: 2024-05-01 - Data updated: 2026-08-29 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/h2o-breath-hold-trainer/id6501970723/reviews.md ## What is H2O Breath Hold Trainer? Unlock the full potential of your breath with Breath Hold Trainer, the ultimate tool for building CO2 tolerance, increasing lung capacity, and mastering mental resilience. Designed for freedivers, athletes, and anyone looking to improve their breath control, this app offers a suite of powerful features to help you train smarter. Features: • Customizable CO2 & O2 Training Tables: Tailor your breath-hold sessions to match your goals and experience level. • Performance Tracking & Insights: Visualize your progress over time with detailed charts and analytics. • Dynamic Training Modes: Challenge yourself with advanced training methods to push your limits. • Personalized Assessments: Discover your max breath-hold, BOLT score, and other key metrics to guide your training. • Seamless User Experience: Enjoy a sleek, intuitive interface designed for both beginners and pros. Why Choose Breath Hold Trainer? Whether you’re preparing for a freediving competition, enhancing your athletic performance, or simply improving your overall well-being, Breath Hold Trainer offers a scientifically backed approach to breath training. From structured training ses to on-the-go tools, this app is your companion on the journey to better breathing. ## Key features - Customizable CO2 & O2 training tables - Performance tracking and insights - Dynamic training modes - Personalized breath-hold assessments - Intuitive user interface ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Premium Edition | $4.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/h2o-breath-hold-trainer/id6501970723/reviews.md ### 5/5 — Amazing apnea workout generators! *2026-07-19* Best app around for creating endless workouts for pool and land apnea training ### 5/5 — Love the new updates! *2026-07-19* This app just keeps getting better! The new updates are so helpful and I’ve found it so easy to use. Best breath app around. Premium features are worth it too! ### 5/5 — Already making impact *2026-06-28* This app is great, the categories are very helpful and the game is great too. ### 5/5 — Love the tool, bug still there *2025-11-27* Using it for CO2 training. Finally worked out why my cardio is so “bad”. However the timer in the CO2 tables jumps from 2 minutes to 22 seconds and then keeps going down. ### 5/5 — Best free app out there *2025-07-01* Helped to increase my max breath hold and overall stress tolerance. ### 5/5 — Great app! *2024-07-13* Beyond the physical benefits, the app has been instrumental in focusing on controlled breathing and mindfulness exercise ### 5/5 — Works Great!!! *2024-05-03* Love this app, helped so much with my breath hold and overall fitness, can’t recommended enough! ### 5/5 — Incredible tool *2024-05-03* I have been using this technology for years, but I never thought an app could make it so easy to track and monitor. I have increased my lung capacity over 30% since using this. Highly recommend! ### 5/5 — Helped Immensely! *2024-05-03* Love this app. Best app ever for lung capacity ## Frequently asked questions about H2O Breath Hold Trainer ### What is Breath Hold Trainer? Breath Hold Trainer is a health and fitness application designed to help users increase their lung capacity and CO2 tolerance through structured breath-hold exercises. It offers customizable training tables and performance tracking. ### Who is Breath Hold Trainer for? This app is ideal for freedivers, athletes looking to enhance their performance, and anyone interested in improving their overall breath control and mental resilience. It caters to both beginners and experienced users. ### Does Breath Hold Trainer have ads? No, Breath Hold Trainer does not contain advertisements. The app is free to download and use, with optional in-app purchases available for enhanced features. ### What kind of training does Breath Hold Trainer offer? Breath Hold Trainer provides customizable CO2 and O2 training tables, dynamic training modes, and personalized assessments to help users improve their breath-hold capabilities. It aims to build CO2 tolerance and increase lung capacity. ### Can I track my progress with Breath Hold Trainer? Yes, the app features performance tracking and insights, allowing users to visualize their progress over time with detailed charts and analytics. This helps in understanding and guiding their training journey. ### What devices is Breath Hold Trainer available on? Breath Hold Trainer is compatible with iPhone, iPad, and iPod devices. It is designed to offer a seamless user experience across these Apple platforms. ### How often is Breath Hold Trainer updated? The latest version of Breath Hold Trainer is 6.5.0, last updated on March 30, 2026. This indicates a recent update, suggesting the app is actively maintained. ### What is the age rating for Breath Hold Trainer? Breath Hold Trainer has an age rating of 4+, making it suitable for a wide range of users. This rating suggests no mature content is present in the application. ## Version history (last 5 releases) ### 8.4.0 — 2026-08-19 H2O minigame update: Max Breath Hold mode now uses your real personal best as the challenge target, for an even tougher test. Plus a new high score system to track and beat your top runs. ### 8.3.3 — 2026-08-10 Minor fixes. ### 8.3.2 — 2026-08-08 Added an optional 10-second get-ready countdown before BOLT, Max Exhale, Static Baseline, and Dynamic assessments — toggle it on per test if you want a moment to prepare before the timer starts. ### 8.3.0 — 2026-07-23 Build and save your own custom breath-hold training tables — pick a template, drag to adjust hold and recovery times, and run it like any other table. CO2, O2, and Custom Tables now live together under one Training Tables menu. Personal records are now called out right in your training log, charts, and after every session. ### 8.2.0 — 2026-07-22 Smarter workout generators: Land and Pool WOD difficulty now actually changes your workout — harder settings mean more breath-hold work and tougher movements, easier settings dial it back. Land WODs also hit your target time more accurately, and both generators now give more variety between rounds. Manual max entries can be backdated and show up properly in your training log and progress charts. ## Apps similar to H2O Breath Hold Trainer | App | Rating | Price | Category | | --- | --- | --- | --- | | [Breathing Coach For Meditation](https://appshunter.io/ios/app/breathing-coach-for-meditation/id6472199607) | — | Free | Health & Fitness | | [Breath Routine](https://appshunter.io/ios/app/breath-routine/id6446053086) | 2.0 (1) | Free | Health & Fitness | | [Freediving Breath Trainer](https://appshunter.io/ios/app/freediving-breath-trainer/id6444132831) | 5.0 (4) | Free | Health & Fitness | | [Apnea Trainer: Nea](https://appshunter.io/ios/app/apnea-trainer-nea/id6461216531) | 5.0 (11) | Free | Health & Fitness | | [Apnea Training for Freediving](https://appshunter.io/ios/app/apnea-training-for-freediving/id6474778415) | 5.0 (2) | Free | Health & Fitness | | [Freediving hold breath + Apnea](https://appshunter.io/ios/app/freediving-hold-breath-plus-apnea/id6462336236) | — | Free | Health & Fitness | ## Related topics [h2o breath hold trainer](https://appshunter.io/ios/topics/h2o-breath-hold-trainer) · [breath hold trainer](https://appshunter.io/ios/topics/breath-hold-trainer) · [breath holding](https://appshunter.io/ios/topics/breath-holding) · [hold trainer](https://appshunter.io/ios/topics/hold-trainer) · [breath hold](https://appshunter.io/ios/topics/breath-hold) · [breath buddy app](https://appshunter.io/ios/topics/breath-buddy-app) --- *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 2026-08-29.*