Zeitwell

Zeitwell reads the Health data your iPhone and Apple Watch already collect and turns it into one directional number — your biological age — then into a daily routine you can actually follow. FREE, AND IT STAYS THAT WAY No subscription, no paywalled features, no account. The whole app is free. NOTHING LEAVES YOUR IPHONE There is no server and no account, because there is nowhere for your data to go. Your sleep, heart rate and biological age are read on-device and stay there. The coach runs on Apple Intelligence, on your phone. SEE THE NUMBER Your biological age, scored from up to 9 weighted signals — VO2 max, HRV, resting heart rate, sleep duration and regularity, daily movement, diet quality, meal timing and circadian alignment. It shows a range, not a point, and always states how many signals it used, so you know what the number rests on. TALK IT THROUGH An on-device coach that reasons from your actual numbers. Ask why HRV drops after a hard session, or what to prioritise this week. It says plainly when it doesn't have the data rather than guessing. LIVE IT, DAY BY DAY Your day, from wake to wind-down: nine rows with the evidence on each, ticked by Apple Health, your meal photos, or you. Reminders only for the three that matter — cardio, strength and the wind-down. NO NEW HARDWARE Nothing to buy. Zeitwell reads Apple Health, so it works with the Apple Watch or tracker already feeding it. The more signals it has, the more the score rests on — and the card always tells you how many it used. Zeitwell is a wellness and education tool, not a medical device. It does not diagnose, treat, or predict disease, and its biological-age reading is directional, not a lifespan prediction. Always check with your doctor before making significant changes to your health or exercise routine.