OxyBoost vs STAmaster

OxyBoost is a minimalist breathwork training app for practicing breathing patterns, breath holds, and relaxation. Create adjustable exercises and track your practice over time. Key Features: • Box breathing • O2 / CO2 / Relaxation (no contraction) apnea tables • Customisable exercises with adjustable intervals • History and statistics • Live heart rate and blood oxygen from supported external Bluetooth sensors • Interactive sensor charts with breathing and hold phases • Share exercise by link or QR • Music during exercises, with search, styles and synced favorites • Offline listening for tracks whose artists enable downloads • Voice guidance and subtle notifications • Dark and light theme support • Practice screen customisation • Realtime sync across your devices • Training history and music favorites saved to your account • Sign in with Apple Sensor readings are provided by a compatible external Bluetooth device; OxyBoost does not measure heart rate or blood oxygen using the iPhone itself. The available readings and their accuracy depend on the connected sensor. Readings are displayed and saved as part of your training history and are not intended for diagnosis, treatment, medical decisions, or monitoring the safety of a breath hold. Disclaimer: This app is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified health provider before starting any breathwork or apnea training and before making medical decisions. Do not disregard medical advice or delay in seeking it because of something you have read in this app. Terms of Use: https://oxyboo.st/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://oxyboo.st/privacy

STAmaster is the dedicated Static Apnea (STA) training companion for freedivers of every level — from beginners working toward their first 2-minute hold to competitive athletes chasing podium times. PRECISION HOLD TIMER Voice-coached breath-holds with real-time contraction marking. The high-precision timer continues running when your screen locks, so you can train with your eyes closed. CO2 & O2 TRAINING TABLES Create fully custom CO2 tolerance and O2 adaptation tables. The app guides you through every round with audio cues and automatically logs each session to your history. AI COACHING A built-in rule-based coach analyses your session data and delivers personalised feedback after every session. Detect training plateaus, track CO2 tolerance trends, and receive actionable tips calibrated to your actual performance history. PERSONAL BESTS & ANALYTICS Every session is logged. Review your hold time history, PB progression, contraction onset trends, CO2 tolerance curves, and session volume over time in the Progress tab. 28-DAY TRAINING PLANS Generate a personalised 4-week training plan based on your current PB, goal, experience level, and weekly availability. Plans use proper periodisation — foundation, CO2 focus, push, and integration weeks. 4MIN+ CHALLENGE Already holding 3:00? The 14-day 4min+ Challenge pairs a short guided prep each day (relaxation, rib-cage and diaphragm stretching, exhale holds, meditation) with breath-holds and CO2/O2 tables scaled to your PB, building to a relaxed 4:00+ attempt. SUPPLEMENTARY TRAINING Guided breathwork protocols, freediving-specific yoga flows, cardio sessions, and meditation exercises are all included — because STA performance depends on whole-body fitness. HEART RATE & SPO2 Connect a Bluetooth heart rate monitor (Polar, Garmin, Wahoo) for live heart rate while you train. Add a Bluetooth pulse oximeter for live SpO2, with an optional low-SpO2 warning during holds. DIVE LOG BACKUP Optionally back up your sessions to a free freediver.space account and see your training next to your watch dives. SAFETY FIRST STAmaster enforces a mandatory buddy check before any wet static (in-water) session. The app will not start a water breath-hold without a confirmed training partner present. Freediving safety is non-negotiable. WHAT IS STATIC APNEA (STA)? STA is a competitive and recreational freediving discipline in which the athlete floats face-down and holds their breath for as long as possible. It is the foundation of all freediving performance and the primary target of breath-hold training. REQUIREMENTS - iPhone with iOS 17 or later - Bluetooth heart rate monitor or pulse oximeter (optional, for live heart rate and SpO2)