CardialOS: Heart & Recovery

CardialOS reads the biometrics your Apple Watch already records — heart-rate variability, resting heart rate, VO₂max, sleep, and your workouts — and turns them into a clear, honest picture of your cardiovascular recovery, training load, and fitness. No hype, no vanity scores. Just a straight read on how your heart and body are adapting, so you can train with intent and recover on purpose. WHAT CardialOS SHOWS YOU • Recovery — a daily read built from HRV, resting heart rate, and sleep. • Training load — acute vs. chronic load and your acute:chronic ratio, so you build fitness without digging a hole. • Strain & stress — how hard a day asked of you, and how your body is carrying it. • Cardio fitness — VO₂max trends, a heart-rate-to-VO₂ view, and a race-time predictor. • Heart-rate zones & training distribution — where your time actually goes across easy, threshold, and hard. • Workouts — per-session detail with heart-rate drift (decoupling) and efficiency. • Vitals — HRV, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and sleep, with trends. • Cardiovascular age — how your fitness compares to your years. HONEST, SUPPORTIVE GUIDANCE CardialOS's voice is plain and kind. On a hard day it tells you to hold steady and protect your sleep — not that you're crushing it. The goal is a read you can trust over months, not a dopamine hit. YOUR DATA STAYS ON YOUR DEVICE CardialOS reads from Apple Health and does its calculations on your device. Nothing read from Apple Health is ever sent to a server. You sign in with Apple or Google; the account, and the setup details you enter — birth date, sex, weight — are what it holds, shared with our other apps you sign in to. (Anonymous usage and crash diagnostics help us fix bugs — never your health values. See our Privacy Policy.) BEST WITH AN APPLE WATCH CardialOS works with the heart-rate, HRV, sleep, VO₂max, and workout data your Apple Watch writes to Apple Health. The more your Watch records, the richer your picture. CardialOS is a personal fitness and wellness tool. It is not a medical device and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified professional about your health.