How is your
body today?
Body Battery reads your HRV, resting heart rate, sleep and workouts to compute a clear, personal picture of your readiness — so you can decide whether to push, maintain, or recover.
Powered by Apple Health
Reads HRV, RHR, sleep stages and workouts you already track.
Personalized to your baseline
Compares today to your last 30 days, not to a generic average.
Watch & Widgets
Glance at readiness from your wrist or home screen.
Privacy-first
Health data stays inside the Apple Health permissions you grant.
Real signals.
Clear answers.
Body Battery quietly reads four signals from Apple Health and turns them into one coherent system of daily metrics. No new sensors. No new wearables. Just a sharper read on what you already track.
Inputs · Apple Health
Outputs · Body Battery
One system.
Six clear numbers.
Readiness sits at the centre. The other metrics explain it — what's recovered, what's drained, what's accumulating — so you understand the score, not just glance at it.
Readiness
Primary · 0–100A single, personal number from 0–100 that answers one question: how much do you have today? Calibrated against your own last 30 days, not a population average.
Recovery
● HRV-drivenHow well your nervous system bounced back overnight. Based on HRV and resting heart rate against your trend.
Battery
● LiveYour real-time energy reserve. Drains with stress and exertion, recharges with rest and sleep.
Stress
● Low todaySustained sympathetic load inferred from heart-rate dynamics during non-workout time. Lower is better.
Sleep
● NightlySleep quality score combining duration, deep and REM stages, weighted against your need.
Exertion
● Hard targetToday's effort against your prescribed window. Stay in the green to progress without overreaching.
Push, maintain,
or recover?
Most apps tell you what happened. Body Battery tells you what to do with today. Three honest options, recommended from the data — never a generic plan.
HRV above baseline, sleep was solid, recent load in range. A hard session — intervals, threshold, a PR attempt — is well within reach.
You're recovered but not peaking. Hold the rhythm: zone-2 work, technical drills, and let the trend keep building.
HRV is suppressed or load has stacked. Choose mobility, an easy spin, or a true rest day — the gain comes from absorbing.
Personal, not population
A 60 for you isn't a 60 for someone else. Your scores are calibrated against your own rolling 30-day window, so good days look good and bad days look bad — for you.
Trends over noise
One night doesn't change a season. Body Battery weights longer-term trends so a single late dinner or a missed run doesn't tank your guidance.
Decision-shaped
Every screen is built around one question — push, maintain, or recover? — instead of an undifferentiated dashboard of charts.
Quiet by design
No streak shaming. No alarmist red. The app stays out of the way until something actually warrants your attention.
Patterns you'd
otherwise miss.
Body Battery looks across weeks, not just days. The acute-to-chronic load ratio, training effect rings and zone-coloured heart-rate timelines turn raw activity into actionable shape.
Training Load Ratio
30 Days60 DaysSuggestion: increase weekly load by ~5–10%.
Workout · Thursday 23 Apr
DetailScores you can
actually read.
Every number can be opened up. Tap a metric and you see the inputs behind it, weighted by what changed today versus your baseline. No black box, no mystery wellness math.
82 — what's behind it.
A breakdown of the four signals shaping your score, ranked by impact. Green bars push readiness up; amber bars pull it down. The score updates as new data syncs from Apple Health.
At home on iPhone,
iPad, and Watch.
Body Battery is built only for Apple. That's the point — every surface is designed to fit the device it's on, from a glanceable widget to a full Watch face complication.
A read-only relationship
Connect once. Body Battery requests only the categories it needs and re-requests permission whenever scope changes.
Readiness, on the wrist
A complication for your favourite face plus a quick look at recovery, battery and stress without unlocking your phone.
Three sizes, one glance
Small for the score, medium for the day's verdict, large for trends. Lock-screen complications too.
Your health data stays where it belongs.
Body Battery reads only what Apple Health permissions you grant. We never sell health data, never share it with advertisers, and don't use it to profile you. You can revoke access in one tap and your scores stop computing the moment you do.
Answers, not
asterisks.
Short, direct answers to the questions we get most. Anything else, write in — the team reads everything.
A single 0–100 number that estimates how much capacity you have today. It blends recovery (HRV and RHR), sleep, and the trailing load from your workouts, then compares all of that to your own 30-day baseline.
Train smarter.
Recover better.
Connect once to Apple Health and get a clear, daily read on what your body has — and what to do with it.