STAmaster vs Interval Timer ~ HIIT & Tabata

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)

"The timer numbers are too small to see mid-workout." "I wish I could instantly know when my rest is over." — Sound familiar? This app is an interval timer designed for strength training and HIIT, delivering your workout status intuitively through color changes. The screen turns "Burning Coral" during exercise and "Calm Indigo" during rest — so even if your phone is across the room, a single glance at the color tells you exactly what to do next. ■ Intuitive Timer Experience Through Visual Cues Reading tiny numbers when you're pushing your limits is frustrating. That's why this app features a unique color system. Color Navigation: The screen color changes dynamically for each phase — exercise, rest, and preparation. A glimpse of color at the edge of your vision keeps you informed without breaking your focus, so you can stay fully locked in on your workout. Minimal Design: Only the essential information, displayed large and clear. A clean, distraction-free UI means you can always operate it instinctively. ■ Even More Convenient with Apple Watch If you have an Apple Watch, you can control and track everything right from your wrist. Control & Check at a Glance: Start a timer on your iPhone and monitor or control it directly on your Apple Watch. Haptic Alerts: Tactile feedback (vibration) ensures you never miss a set transition — even when listening to music or working out in a noisy environment. Workout Log: Your workout history is recorded automatically. Sync records between Apple Watch and iPhone to review your past sessions anytime. ■ Total Customization Freedom Handles every scenario — HIIT, Tabata, bodyweight training, stretching, boxing, and more. Second-by-Second Settings: Fine-tune preparation, exercise, rest, sets, and cooldown to match your personal routine. Preset Save: Save your favorite workout menus and launch them with a single tap next time. Switch between multiple routines with ease. ■ Perfect For You If… You want to instantly know when to switch between exercise and rest You want to build a consistent HIIT or Tabata training habit You want to precisely time your gym intervals and level up your workouts You want to use your Apple Watch to train smarter You're looking for a simple, easy-to-use timer without complicated settings Every color change programs your next move into your body. This timer is your ultimate partner for a stronger daily workout.