Cold Mastery vs Aerio

Master the cold — one session at a time. Cold Mastery is your guided companion for cold showers, ice baths, and cold plunges. No method dogma, no guru subscription — a precise tool that turns your intention into a daily practice. THE COMPLETE PRACTICE ON iPHONE • Timer with adjustable lead-in and voice coach • Guided breathing exercise (Box Breathing, Power Breathing, and more) before each session • 3 training programs — from beginner to Cold Master • Streak tracking with milestones and daily goals • Temperature tracking for every session • Session history, calendar, and progress charts WITH APPLE WATCH: MEASURED LIVE Wearing a Watch adds the crucial layer — in the shower, in the plunge, and in open water: • Direct access from the watch face — two taps and your session is running • Haptic countdown pulses every 15 or 30 seconds — close your eyes, focus on your body • Live heart rate during the session: see your cold shock response in real time • Recovery phase with HR recovery tracking after the cold • Water Lock for safe wear underwater PROGRESS YOU CAN MEASURE Cold Mastery doesn't just show you how long you lasted — it shows how your body adapts: • Peak heart rate trend: your cold shock response decreases over weeks • Recovery rate: how quickly your heart rate returns after the cold • Endurance: from 15 seconds to Cold Master PROGRAMS THAT CARRY YOU Three evidence-based training programs give your practice structure: • Cold Starter — your entry point with short cold showers • Cold Seeker — increase duration and intensity step by step • Cold Master — for the experienced: ice baths, plunges, and longer exposures YOUR DATA STAYS YOURS • No account required — no profile, no email • No data sent to external servers — your sessions stay on your devices • Private iCloud sync between iPhone and Watch COLD MASTERY PRO The core features with cold showers, timer, and streak are free. Pro unlocks: • All session types (ice bath, cold plunge, open water) • Guided breathing exercise with voice coach • Detailed progress charts (HR trends, recovery rate) • Training programs Not a medical device. Cold exposure carries risks — educate yourself and listen to your body. Not suitable for certain cardiovascular conditions, asthma, or during pregnancy. When in doubt: consult a doctor. Terms of Use (EULA): https://coldmastery.com/en/terms Privacy Policy: https://coldmastery.com/en/privacy

Most breathing apps give you a timer and a circle. Aerio guides every breath with a calm animation and a distinct haptic cue for each phase, on iPhone and on Apple Watch. With Premium, your Apple Watch also shows how your heart rate settles while you breathe. 18 TECHNIQUES, 6 OF THEM FREE Box Breathing, 4-7-8, Coherent Breathing, Belly Breathing, Physiological Sigh and Lion's Breath are free, with no account. Every technique comes with exact timing and a short how-to. PICK BY PURPOSE Techniques are grouped by what you need right now: fall asleep, focus, stress relief or energy. ON YOUR WRIST A full Apple Watch app with its own session flow. Inhale, exhale and hold each feel different, so you can breathe with your eyes closed. No iPhone needed nearby. A complication shows your streak. MINDFUL MINUTES With your permission, every session is saved to Apple Health as mindful minutes. PROGRAMS AND COLLECTIONS 7 Days Calm and 5 Days Focus take you through it day by day; days that use a Premium technique are marked. Collections for getting started, quick calm and bedtime. ALWAYS AT HAND Home and lock screen widgets, a Live Activity during the session, a Control Center button and Shortcuts. Optional sound cues, background sound, spoken phases, a gentle start and finish, and a daily reminder. Your history syncs through your private iCloud. Heart-rate data stays on your iPhone and Apple Watch. YOUR PROGRESS Streak, sessions and minutes per week, and a weekly chart. AERIO PREMIUM • All 18 techniques, including Nadi Shodhana, Ujjayi, Kapalabhati and Buteyko • Live heart rate during Apple Watch sessions, and a calm score (0–100) afterwards • Find your resonance rate, and an adaptive pace that follows your pulse • Three longer programs: 14-Day Sleep Reset, 10-Day HRV Training, 21-Day Mindfulness • Your own protocols: seconds per phase, cycles or a target duration, import from a file • Advanced statistics: weekday average, 30-day history, CSV export • Reminder schedules with your own times for each weekday Heart-rate features need an Apple Watch. Intense techniques show a safety note and ask you to confirm before the first start. Aerio is a practice app, not a medical product. It does not diagnose or treat anything; the calm score is a wellness hint, not a medical value. Terms of Use By using this app, you agree to Apple's standard End User License Agreement (EULA), available at: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/