Every number below is computed by an engine inside the app, on your own baselines, not looked up from a category average.
Four weighted components, renormalised over whatever your night actually measured, rather than scoring an unmeasured component as zero. Duration is penalised in both directions, and a ceiling stops good efficiency rescuing a five hour night.
Sleep need is dynamic: a 7:45 base, plus yesterday's training load, plus repayment on a 14 night rolling debt, plus a flag when your resting heart rate or breathing rate has drifted off your own baseline.
Apple Vision runs on device first, free and offline. A cloud model is the fallback, not the default. Every result opens for review before it is logged, so a portion can be corrected before it becomes a number in your day.
Targets come from Mifflin-St Jeor and the bodyweight Health measured, with protein at roughly 1.6g per kg rather than a flat percentage. Fibre is a floor, sodium is a ceiling, and sugar is left untargeted because no honest target exists.
Recovery weighs heart rate variability, resting heart rate, sleep and sleep consistency against your own median and spread. Strain is a 0 to 21 figure built from Banister TRIMP over real heart rate samples, not a step count dressed up.
Every reading carries a confidence label, from no data through rough and fair to solid, and it names the inputs it was missing. A day the Watch never saw is reported as unknown, never as zero.
Your real Apple Move, Exercise and Stand rings. Lift records with stale record flags, plate maths, route tracking, automatic run detection, and rep counting from body pose.
Acute to chronic load ratio with named bands: under 0.8 is detraining, under 1.3 balanced, under 1.5 building, and 1.5 or over is a spike. The point is knowing which one you are in before your body tells you.
Photograph a garment. Its dominant colour is read on device, and its fabric, formality and season are identified. Outfits are scored against seven explicit rules, and each look explains itself in a sentence you can disagree with.
Laundry is a deterministic fabric lookup, never a guess: a load runs as gently as its most delicate item demands, and an unknown fabric routes to the gentlest setting rather than the likeliest one.
Apple Vision body pose gives head angle, trunk lean and hip offset as real geometry. Nothing leaves the phone, and a front on photo is rejected with a plain reason instead of being scored anyway.
Raw angles are stored beside the score, so a trend can be drawn in degrees and an old threshold can be revised later. It is a measurement, not a medical device.
It opens with your recovery, your sleep debt, your remaining macros, today's session and your last five journal entries already in hand. Ask it something and the answer is about you, not about people in general.
About twenty actions it may take: set a target, log water, add a task, move a garment to the wash, open a screen. Every one is clamped on device, reported back in plain words, and none of them are destructive.
A watchOS app that runs a real workout session and streams live heart rate back to the phone. Home Screen and Lock Screen widgets for today, the checklist and both ring sets, including interactive ones you can tap without opening the app. Live Activities for workouts and for the day.
Siri shortcuts are registered at install with no setup step. Spotlight indexes lifts, meals and journal entries, and deliberately not your weight, measurements or scores.
Everything is stored on device and synced through your own private iCloud database. There is no Life OS account server holding a copy of your health history, because there is no Life OS server holding health history at all.
No analytics kit, no advertising kit, no third party tracker of any kind is built into the app. Photos you choose to scan go to an identification service and are not kept there. The privacy policy spells out every item that leaves the device.
Any one of these exists elsewhere. What does not exist elsewhere is the wiring between them.