Understand your sleep, training and recovery.

Drift is a private longevity coach for iPhone and Apple Watch. It reads your Apple Health data and gives you a daily Drift Score against your own baseline, a Longevity Score across eight biomarkers, a biological-age estimate, a Fitness Score and bedtime guidance, with the analysis on your devices.

Drift Score compares today with your own rolling baseline for the same weekday. Longevity Score grades eight health measures against age-adjusted thresholds drawn from research and guidelines. One highlights personal change; the other gives longer-term context.

Yes. It reads whatever is in Apple Health, so it works with an Apple Watch or any ring, band or watch that writes to Health. Available measures vary by device and permissions; with an iPhone alone you get a partial score from activity and steps.

Yes, through Apple Health. Drift never talks to a manufacturer's cloud; it reads whatever the device or its app writes to Health.

Drift adjusts your chronological age using available VO2 max, resting heart rate, HRV, sleep, walking speed and exercise measures. It is a directional estimate from these measures, not a clinical or epigenetic test or a prediction of years left to live.

The Drift Score needs about four weeks of history: at least four earlier days of the same weekday for each measure. Drift imports up to 60 days of your existing Apple Health history on first launch, so if you've worn a watch before it can calibrate straight away.

Partly. The Watch works out today's strain from workouts in its own Apple Health data, and with enough fresh readings it updates your Drift Score itself, labelled Watch estimate. The model behind that estimate, your personal training inputs and HRV baseline, and your sleep, longevity and fitness scores come from the iPhone. Complication refreshes follow watchOS's own schedule.

Yes. Drift is built specifically for iPhone Duo: on an opened Duo with iOS 27.1, biomarker, Longevity Score and Drift Score screens place their charts beside the explanation and coaching. Compact screens and larger text sizes keep the scrolling view.

Yes. Ask Drift uses Apple's on-device Foundation Models, so it needs an iPhone with Apple Intelligence available and turned on. Scores, patterns and daily insights work without it.

Partly. Your daily Drift Score with today's insight, your Longevity, Fitness and Sleep scores, the Bedtime Window, the Apple Watch app, widgets and notifications are free. The details behind them in the iPhone app, such as each category and pillar, your biological age, your earlier days and the pattern detectors, come with one auto-renewing subscription: US$5.99 a month or US$49.99 a year, with a 7-day free trial for eligible new subscribers. The App Store shows the price in your country.

No. Health analysis runs on your iPhone and Apple Watch, which share app context with each other. Stationify receives no health data, and there's no account, analytics or tracking. Apple handles purchases, and weather lookups use your approximate location.

Your iPhone shares the model it has trained and your weekday baselines with your Apple Watch. The Watch scores its own fresh Health readings the same way and labels the result Watch estimate. It updates when you open the app and in watchOS background refreshes, not continuously, and shows your iPhone's latest result when there isn't enough fresh data, the model is more than a week old or you've changed time zone. The model moves only between your own devices; Stationify never receives it.

The Watch shows the heart-rate zone durations Apple Health recorded when a supported workout provides them, and labelled estimates otherwise. Strain uses recorded zones only when you choose the Apple Health zone method on iPhone.

Show Drift Score, Open Sleep Summary and Enable Wind-Down Reminder. They open Drift after your iPhone is unlocked. The wind-down reminder needs Drift's setup to be finished and alarm permission.