Your body,
intelligently read.
Steady reads your Apple Watch signals — heart rate, HRV, sleep, temperature — and turns them into a daily health score, personalised circadian schedule, and early illness detection. All on your device. Your data never leaves.
Six engines.
One clear picture.
Health Confidence Score
A single 0–100 score built from 6+ biometric signals, weighted against your personal 90-day baseline. Know how your body is actually doing today.
Circadian Schedule
Know exactly when to do deep work, exercise, and wind down — from the two-process model adapted to your actual sleep patterns, not generic advice.
Illness Radar
Detects deviations from your baseline that match patterns of oncoming illness — often 24–48 hours before you feel symptoms.
Strain & Recovery
Banister TRIMP-based strain scoring from every workout. Recovery from HRV, sleep quality, and resting HR trends. Know when to push and when to rest.
Sleep Intelligence
Sleep score, debt tracking, stage analysis, consistency scoring, and environment monitoring. Find out exactly why you wake up tired.
Zero-Server Privacy
No backend. No analytics. No ads. All processing happens on your iPhone. Your data syncs only through your personal iCloud — we literally cannot see it.
Three steps. Every morning.
Watch collects overnight
While you sleep, Apple Watch captures HRV, sleep stages, wrist temperature, resting heart rate, SpO₂, and respiratory rate.
Steady processes on-device
Six independent engines run against your personal baseline. No cloud round-trip. No latency. No privacy trade-off.
You get a complete picture
Health score, recovery state, illness risk, your circadian schedule for today, and personalised coaching — before your first coffee.
Every algorithm cites its source — from the Borbély two-process model (1982) for circadian rhythm, to Tanaka (2001) for max heart rate, to Ekelund (2019) for sedentary thresholds. No black boxes.
Your health data is yours. Always.
Zero servers. Zero analytics. Zero ads. Zero exceptions. Steady processes everything locally on your iPhone. Your data syncs only through your personal iCloud account — end-to-end encrypted, never accessible to us.
Read the privacy policy →Start understanding your body.
Free to download. No account required. Apple Watch + iPhone.
Download Steady — Free