NEXUM Fitness

Your smart ring, decoded. Nexum turns recovery, sleep and vitals into clear daily guidance — processed on your phone, owned by you. No subscription.

Your body. Your data. Any device.

Nexum turns the signals from your smart ring into clear, honest health intelligence — and it does the thinking on your phone, not in someone else's cloud.

WHAT YOU GET • Today — three daily scores at a glance: Recovery, Effort and Sleep, with the story behind each number. • Sleep — an honest, re-staged night view you can actually read and edit. • Vitals — heart rate, HRV, SpO₂, skin temperature and activity, from live readings to long-term trends. • Body — your BioAGE and body signals, measured against your own history. • Trends & patterns — see how you change against your own baseline, not a population average. • Workouts — start a session, record your route, and see what it cost you. • Cycle & women's health — menstrual phases, fertile window and period prediction. • Coach — ask your own data a question and get an answer built from what your ring actually measured. • Home-screen widget — your day, one glance away.

BUILT LOCAL-FIRST Your phone is the system of record. Every score is computed on the device from your own history, and Nexum keeps working with no connection at all. Your raw measurements, your sleep stages and your workout routes never leave the phone.

YOUR DATA, YOUR CALL • Export anytime as JSON, CSV or PDF. • Delete anytime — the data on your phone, and your account with it. • No advertising, no ad identifiers, no third-party analytics. • The account is optional. Sign in only if you want the coach, order status for your hardware, or account deletion from inside the app — everything else works signed out. • When you ask the coach a question, Nexum sends a small set of derived values — scores, trends, deltas — to our EU servers and on to our AI provider. Never your raw measurements, and never without you asking.

APPLE HEALTH Optional and read-only. Connect it and your iPhone or Apple Watch fills the activity gaps for the hours the ring was not worn, adds workouts you recorded elsewhere, and cross-checks your sleep. Nexum never writes to Apple Health.

WORKS WITH YOUR HARDWARE Nexum is built to be hardware-agnostic. Today it pairs with the Nexum Ring and compatible JC Vital rings and bands; more devices are on the roadmap — so you can change hardware without losing your history.

NO SUBSCRIPTION The app is yours after a one-time device purchase. No mandatory subscription to read your own body.

— Nexum is a wellness and fitness product and is not a medical device. It does not diagnose, treat or prevent any disease. For medical questions, talk to a qualified professional.