Cold Mastery vs Kelvin

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

Kelvin is a hardware-agnostic cold-exposure tracker — a gorgeous plunge timer, a session log with history and streaks, a breathwork trainer, and adaptation insights. Not a tub remote. Works with ANY cold source — ice bath, cold shower, lake, or chest-freezer tub. Kelvin owns the practice, not the tub. Master the cold — on any tub, shower, or lake. Every second in the cold, counted. WHY PLUNGERS CHOOSE KELVIN • A real timer, log and history that actually work. Breath-up rounds, a plunge countdown with a first-30s cold-shock breathing coach, and a guided warm-up. Built to log every session — the basics the category leader still misses. • Works with any cold source — no hardware, no pairing, no router, no $5,000 tub. Ice bath, shower, lake, freezer: pick a source and start. • Safety guardrails the whole category ignores — cold-shock and afterdrop guidance, a sensible exposure ramp, contraindication warnings, and a hard lock on breath-holds in or before water. Free, never paywalled. • Works offline, opens instantly — local-first, no account, nothing to crash. FREE FOREVER • The Plunge timer: breath-up, plunge countdown with first-30s cold-shock coaching, and a guided warm-up — for any cold source • Log sessions: temperature (C/F), duration, water source, how you felt, post-plunge clarity and mood • Streaks and a calendar heatmap: current and longest streak, total time-in-cold, longest plunge, weekly minutes • Breathwork trainer: box breathing and Wim-Hof-style rounds, with the safety lock that never lets you breath-hold in or before water • Safety guardrails: cold-shock and afterdrop guidance, exposure ramp, and contraindication warnings — free, never paywalled • Protocols library: beginner ramp, Wim-Hof-style, contrast (sauna to cold), athletic recovery • 90-day history, CSV export, local backup and restore • Large text, high contrast, reduced motion — accessibility is free KELVIN+ (OPTIONAL, 100% ON-DEVICE) • Adaptation insights: your cold-capacity curve, the temperature-by-duration tolerance trend, time-in-cold banked this month, best time of day, and mood correlation • On-device coach digest: a plain-language weekly recap and a personalized next-week ramp — your data never leaves the phone • Custom protocols and contrast builder, plus sauna and heat sessions • Goals and challenges and shareable streak cards • Unlimited history and advanced stats Built to be your cold plunge tracker, ice bath timer, cold exposure log, and breathwork trainer — all in one trustworthy place, on any cold source. Kelvin is not medical advice. Cold exposure carries real risks — cold shock, afterdrop, and, with breath-holds in or near water, shallow-water blackout and drowning. Consult a doctor before starting, especially with a heart condition, high blood pressure, or during pregnancy. Privacy Policy: https://adelyons.com/apps/kelvin/privacy.html Terms of Use: https://adelyons.com/apps/kelvin/terms.html