# AI Apnea Trainer

> AI Apnea Trainer (iPhone/iPad app by hayato yasuhisa.)

- Source: https://appshunter.io/ios/app/ai-apnea-trainer/id6758535310 (this page in markdown: same URL + `.md`)
- Developer: [hayato yasuhisa](https://appshunter.io/developer/1873491175)
- Category: Health & Fitness, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 18 MB
- Languages: English, Japanese
- Released: 2026-02-03
- Data updated: 2026-05-15
- User reviews in markdown: https://appshunter.io/ios/app/ai-apnea-trainer/id6758535310/reviews.md

## What is AI Apnea Trainer?

For freedivers, spearfishermen, and all athletes who want to control their autonomic nervous system to enhance performance.
AI Apnea Trainer uses the practical disciplines of freediving training to transform your daily practice into a steady, visualized journey of growth.

[ Key Features ]

■ Intuitive Dashboard & Modern Navigation (New)
- Completely redesigned Home dashboard and Logbook. Review your daily progress and performance trends more beautifully and intuitively than ever.

■ Dry Apnea Training
Comprehensive support for dry training, from planning and execution to AI-driven menu updates.
- Unlimited Table Creation (O2 / CO2, NC, etc.): Create and save unlimited custom tables tailored to your goals, building an unshakeable training plan.
- MAX HOLD Mode: Test your personal best and understand your current limits. Records and supports the full breath-hold cycle from Breathe-up to Recovery.
- NC Mode (No Contraction Mode): Build CO2 tolerance through repeated sub-maximal holds that stop before the contraction threshold. Accumulating rounds without contractions safely adapts your body to CO2 and gradually extends your pre-contraction time.
- AI Coaching: Analyzes your session history and perceived exertion to suggest the optimal next training load — fostering steady growth without rushing your progress.
- Absolute Immersion with Audio Cues: Clear audio leads your session so you never need to look at the screen — supporting fully eyes-closed training with smart background playback.
- Live Activities: Track your current phase and remaining time in real-time right from your Lock Screen or Dynamic Island.
- Apple Watch Sync & Haptic Guide: Syncs in real-time with your iPhone to record heart rate during sessions. Wrist vibrations notify you of phase transitions, so you can stay completely relaxed and immersed.

■ Ocean Logs & Advanced Visualization
- Ocean Log Import: Supports .fit, .uddf, and .xml logs. Import directly from your dive computer apps via Share Sheet for seamless visualization.
- Analytics & Dive Comparison: Profile charts for depth, heart rate, and descent velocity. Compare past dives with marine conditions (weather, tides) to plan your next session.
- Dive Bookmarks: Bookmark important dives or personal bests for instant access.
- AI Coach Dive Analysis: After each logged dive, the AI Coach automatically generates a personalized coaching comment — highlighting what went well and flagging any risk points in your profile.
- Dive Stamp & Social Share: Create stylish dive stamp images from your log data and share them directly to Instagram Stories or any social platform. Customize style, color, and discipline to make every dive memorable.

[ Who is this for? ]
- Freedivers looking to extend their dive time and build mental discipline.
- Spearfishermen wanting to improve silence and efficiency underwater.
- Athletes mastering autonomic nervous system control through breathing techniques.
- Anyone who wants to make meditation and breath-hold training an unshakeable habit.

[ Important Safety Warnings ]
- Freediving and breath-hold training carry risks such as blackouts (loss of consciousness).
- Never practice alone in the water: Always have a buddy when practicing breath-holding at the surface.
- Ensure a safe environment: When doing dry training, always practice sitting or lying down on a soft surface like a sofa or bed to prevent falls and injuries.
- Take professional courses: This app is a training tool and NOT a substitute for proper education. We strongly recommend seeking instruction from knowledgeable and experienced freedivers.
- Never push beyond your limits. If you feel dizzy or unwell, stop immediately.

By downloading this app, you acknowledge and agree that you assume full responsibility for your own safety and health during training.

Your deep self-understanding expands your potential.
Elevate your daily routine to a deeper, quieter dimension with AI Apnea Trainer.


## Version history (last 5 releases)

### 1.5.2 — 2026-04-04

Thank you for using AI Apnea Trainer. This release focuses on internal quality improvements and refinements.
- Refactoring: Dive Log Stamp, AI Coach
- Weather Data Reliability: Improved the weather data fetching logic for greater reliability, including same-day dive imports.
- Other minor fixes.

### 1.4.2 — 2026-03-23

- Completely Redesigned Home Dashboard & Logbook: We’ve modernized the app's main interface and navigation, making it more intuitive and visually appealing to review your daily training progress.
- Advanced Dive Comparison: A new Dive Comparison feature has been added to Analytics, allowing you to overlay and compare current performances against past dives.
- Ocean Log Enhancements: Seamlessly import .fit, .uddf, and .xml dive logs via the in-app menu or directly from other apps using Share Sheet. You can also now record weather and marine conditions (such as tides) alongside your dive profiles.
- Dive Bookmarks: Added the ability to bookmark your most important sessions and personal bests for quick access.
- General Improvements: Routine under-the-hood refinements, including improved Apple Watch real-time synchronization for a more seamless experience.

### 1.3.1 — 2026-03-09

Bug fixes and performance improvements

### 1.3.0 — 2026-03-06

※Release Notes for version 1.3.0.

- Rock-Solid Apple Watch Sync: Completely redesigned the communication algorithm between iPhone and Apple Watch. With advanced handshakes, automatic resynchronization, and diagnostic support, real-time biometric tracking during your holds is now more stable than ever.
- Seamless Dive Computer Integration: Refined the experience of importing `.fit` files from devices like Garmin.
- Revamped Ocean Log Analytics: Beautifully updated the UI and charts for Ocean Logs, allowing you to intuitively review your deep dive performances at a glance.
- Enhanced Heart Rate Chart Precision: Improved the accuracy and interactiveness of post-session heart rate charts, helping you track your body's adaptation second by second.
- General UI refinements and overall performance enhancements.

### 1.2.5 — 2026-02-24

- **Rock-Solid Apple Watch Sync**: Significantly improved the reliability of heart rate and phase synchronization between your iPhone and Apple Watch.
- **Enhanced Voice Guidance**: A completely refactored audio engine ensures that audio cues are stable and reliably delivered, even when your device is locked or the app is in the background.
- **Refined Live Activities**: To prevent accidental disruptions and help you stay fully immersed, we’ve removed the interactive "Pause/Resume" controls from the Lock Screen during "MAX HOLD" sessions.
- General UI refinements, animation fixes, and overall usability enhancements.

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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 2026-05-15.*