About
Freediving Apnea Trainer is a dedicated breath-hold training application designed for freedivers, spearfishers, and yoga practitioners who want to extend their apnea capacity. Available on both iOS and Android, the app automatically calculates CO₂ and O₂ training tables based on the user's personal best breath-hold time, making it immediately useful for complete beginners and fine-tunable for competitive athletes. The app supports connection to external oximeters and Bluetooth heart-rate monitors (including Mi Band 3/4 and Polar devices), recording full SPO₂ and pulse data throughout each session. Detailed charts visualize every training phase—including contraction periods—and display max, min, and average values, allowing divers to analyze performance trends over time. For users without a dedicated sensor, the phone camera can serve as a basic heart-rate monitor. Training controls are thoughtfully designed for wet or physically demanding environments: the volume-down key duplicates the contraction-start action, sessions can be paused or fast-forwarded by phase, and a night/dark theme is available for low-light use. Flexible table editing lets advanced users create fully custom training protocols, while the 'Best Time' section tracks long-term progress. Square breathing and single-breath table modes round out the training toolkit. Voice and vibration alerts keep athletes informed without needing to look at the screen. Garmin device integration is also supported, making the app a versatile companion for serious apnea athletes.
Key Features
- Auto-Calculated CO₂ & O₂ Tables: Generates personalized training tables based on your best breath-hold time, removing guesswork for both beginners and experienced freedivers.
- Oximeter & Bluetooth Device Integration: Connect external oximeters or Bluetooth heart-rate monitors (Mi Band, Polar, Garmin) to log SPO₂ and pulse data in real time during training.
- Detailed Session Charts: Visual charts display pulse and SPO₂ across every training phase, including contraction periods, with max, min, and average statistics per session.
- Smart Voice & Vibration Notifications: Hands-free audio and haptic alerts notify you of phase transitions and contraction onset so you can train without watching the screen.
- Flexible Training Modes: Supports CO₂ tables, O₂ tables, square breathing timer, and one-breath mode, plus full custom table editing for advanced athletes.
Use Cases
- A beginner freediver uses the app to run their first CO₂ table session, letting the app calculate safe work/rest intervals based on their current 1-minute breath hold.
- An advanced spearfisher connects a Bluetooth oximeter to monitor SPO₂ levels during O₂ table training and reviews post-session charts to detect hypoxia risk patterns.
- A yoga practitioner uses the square breathing timer daily to practice controlled breathwork and tracks resting heart rate trends over several weeks.
- A competitive freediver uses custom table editing to create a periodized training plan and logs sessions over months to chart improvement in the 'Best Time' section.
- An underwater photographer trains with the app in a pool to extend comfortable breath-hold duration before a coral reef shoot, using vibration alerts to signal phase transitions without breaking focus.
Pros
- Completely Free: The app is free to download and use on both iOS and Android with no paywalled core features, making it accessible to all divers.
- Broad Device Compatibility: Works with oximeters, Mi Band, Polar, Garmin, and even the phone camera as a fallback heart-rate sensor, suiting a wide range of budgets.
- Hands-Free Controls: Volume-down key duplication and vibration alerts make the app practical to use with wet hands or while wearing gloves.
- Progress Tracking: The 'Best Time' section and historical session logs let users visualize long-term improvement over weeks and months.
Cons
- Limited Language Support: The app currently lacks Portuguese and Turkish translations, which the developers acknowledge and are actively seeking community assistance for.
- Camera HR Monitor Accuracy: Using the phone camera as a heart-rate sensor is noted as unreliable on some devices due to heat from the flash; a dedicated oximeter is recommended.
- Niche Use Case: The app is purpose-built for apnea and freediving training and offers little value outside of that specific sport and practice.
Frequently Asked Questions
Is Freediving Apnea Trainer free to use?
Yes, the app is free to download and use on both iOS (App Store) and Android (Google Play) with no subscription required for core training features.
What training methods does the app support?
The app supports CO₂ training tables, O₂ training tables, square breathing timers, and single-breath mode. Tables are automatically calculated from your personal best breath-hold time, and you can also create fully custom tables.
Can I connect an oximeter or heart-rate monitor to the app?
Yes. The app supports Bluetooth oximeters as well as devices like Mi Band 3/4, Polar heart-rate monitors, and Garmin devices. It also allows use of your phone's camera as a basic heart-rate sensor.
Does the app track my progress over time?
Yes. The 'Best Time' section records your progress, and each completed session is saved in history with full SPO₂ and pulse charts showing max, min, and average values per phase.
Is the app suitable for complete beginners?
Absolutely. The app automatically calculates appropriate CO₂ and O₂ table durations from your current best time, and how-to guides are provided for beginners. Voice and vibration notifications also make it easy to follow sessions without prior experience.
