Before
You feel okay, say yes to normal plans, then spend the next few days recovering.
Unlock Your Apple Watch
Body Insights turns generic Apple Watch data into clear guidance for your energy, recovery, and health.
Get Body Insights
Made for the days that don't feel like the others.
- Apple Watch
- Free
- Private
Stop guessing what your body can handle.
Body Insights turns Apple Watch data into a clear daily read on your energy, recovery, and strain.
Decide what to take on, what to move, and when to protect tomorrow.
What your data can actually tell you.
Use the health signals you already collect to make better daily decisions.
Know what today can hold.
A morning recovery check that reads your overnight glucose - not just your HRV. For a body that doesn't follow a training cycle.
Readiness →
Read what your sleep actually did.
Apple Watch sleep tracking that goes beyond hours-in-bed - stages, efficiency, and overnight glucose, translated into one plain sentence.
Sleep analysis →
Energy tracking for bodies that vary.
For ME/CFS, Long COVID, perimenopause, post-viral recovery. Read what today actually has in it.
Energy module →
Rest. Light. Moderate. Push.
Pacing for chronic illness, in plain language. A second opinion before the day starts - you still decide.
Daily coach →
Calculate your fitness age.
Enter your Apple Watch Cardio Fitness value and get an age estimate now. Your entries stay in your browser.
Fitness age calculator →
Stop losing days to recovery.
Plan around your body before it makes the decision for you.
With Body Insights
You see recovery is low before the day starts, move what can wait, and keep more of the week.
Built because numbers were not enough.
You bought an Apple Watch to understand your body. Then it gave you rings, charts, and sleep scores - but not the answer you needed before the day started.
Body Insights was built for that gap. It reads the signals already on your wrist and turns them into plain language you can act on.
We did not want another dashboard that showed more numbers. We wanted a translator.
Something that could look at HRV, resting heart rate, sleep, stress, glucose, and recovery, then say: "Today has more in it." Or "Today, take it slow."
On-device. No account. No data sold. Ever.
Justina
Founder, Body Insights
Your health data stays yours.
Body Insights is designed for private health tracking. Your data stays on your device.
- On-device storage
- Not sold to third parties
- You choose what to share
Start getting your life back.
Use the Apple Watch you already wear to manage your health and protect your energy.
Guides
Plain-language reads on the things your Apple Watch is already measuring.
Best Sleep Apps for Apple Watch: 7 Useful Picks
Compare the best sleep apps for Apple Watch for Sleep Score, sleep debt, smart alarms, sound recording, reports, and daily planning.
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Fatigue Tracker After Mononucleosis: A Pacing Plan
Use a fatigue tracker after mononucleosis to record energy changes, recent activity, and the later effect. Build a pacing plan around your baseline.
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Does Apple Watch Track Sleep Debt? What It Shows
Does Apple Watch track sleep debt? See what Apple Sleep shows, what it leaves out, and how Body Insights builds a seven-day total.
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Personal Health Baseline: Read Your Apple Watch Data
See how a personal health baseline adds context to Apple Watch data, when population ranges matter, and how to read a change.
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Lyme Disease Fatigue: How to Pace After Treatment
Learn how to pace Lyme disease fatigue after treatment with a two-day log, a worked PTLDS day, and an Apple Watch morning workflow.
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Does Apple Watch Have a Stress Score? What It Can Show
Apple Watch does not include one native stress score, but it can log mood, record HRV, and feed stress apps that read Apple Health data.
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Best Stress Apps for Apple Watch: 7 Options to Try
Compare the best stress apps for Apple Watch for HRV, stress trends, recovery, mood logging, and daily capacity planning.
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Best Pacing Apps for Apple Watch: 7 Options to Try
Compare the best pacing apps for Apple Watch for chronic illness, ME/CFS, Long COVID, POTS, and variable daily capacity.
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Pacing App for Chronic Illness: Energy and Recovery
A pacing app for chronic illness should help you read energy, symptoms, sleep, heart rate, and Apple Watch data before a crash.
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Training Readiness on Apple Watch: What to Check
Use Apple Watch Training Load, sleep, HRV, and recovery context to decide whether today is a training day or a rest day.
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Cardio Recovery by Age: Is Your Apple Watch Result Good?
Find your age band, then compare your one-minute Apple Watch result. The chart shows slower, typical and strong Cardio Recovery ranges.
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Best Apple Watch Apps for POTS: 7 Useful Options
Compare Apple Watch apps for POTS by live heart-rate alerts, standing tests, symptom logs, pacing, and recovery data for daily use.
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Best Body Battery App for Apple Watch: 7 Options
Compare the best Body Battery apps for Apple Watch, including Body Insights, BodyState, Bevel, Athlytic, and PeakWatch for daily recovery.
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WHOOP vs Apple Watch: Recovery, Strain and Sleep
Compare WHOOP and Apple Watch for recovery, strain, sleep, subscriptions and Apple Health. See which setup fits the data you already use.
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Chronic Fatigue Tracker App: Pacing and Recovery Guide
See how a chronic fatigue tracker app can help you pace energy, symptoms, sleep, heart rate, and recovery before the next crash.
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Fitness Age Tracker with Apple Watch: VO2 Max Guide
Turn Apple Watch Cardio Fitness into a fitness age based on VO2 max. See where the data lives and how Body Insights tracks the trend.
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Long COVID pacing: keep the day inside your energy envelope
A practical guide to long covid pacing from an Apple Watch lens: use Apple Watch signals to stay inside your energy envelope and avoid delayed crashes.
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Best Apple Watch Apps for Chronic Illness: 8 Picks
Compare the best Apple Watch apps for chronic illness by pacing, heart-rate alerts, symptom context, recovery, and low-friction tracking.
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Does Apple Watch have Body Battery?
Apple Watch does not ship a Garmin-style Body Battery number, but Apple Health already holds many of the recovery signals behind one.
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Fibromyalgia Symptom Tracker App: Flares and Pacing
See how a fibromyalgia symptom tracker app can reveal flare patterns, pacing cost, sleep debt, and recovery instead of only logging pain.
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Nervous System Age: What Your HRV Trend Shows
Nervous System Age compares your recent HRV with age-based reference patterns. See how the estimate works and what it cannot tell you.
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How Is Stress Score Calculated? HRV and Baselines
See how Body Insights builds an HRV-based Apple Watch stress score from your personal baseline, what missing data changes, and what the result means.
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How Is Sleep Score Calculated? Inputs and Meaning
See what goes into a sleep score, why your own baseline matters, and how Body Insights reads Apple Watch sleep without pretending it is a diagnosis.
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Best Recovery Apps for Apple Watch: 10 Options
Compare Body Insights, Athlytic, Bevel, and seven more Apple Watch recovery apps for daily energy, training, sleep, and pacing.
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POTS Apple Watch Apps: Heart Rate and Pacing Guide
Compare Apple Watch apps for POTS heart-rate alerts, then see how Body Insights adds pacing and recovery context from your Apple Health data.
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Apple Watch Readiness Score: Does Apple Have One?
Apple Watch records sleep, HRV, resting heart rate, and Training Load, but does it show a readiness score? See what is built in and what apps add.
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Apple Watch Recovery Score: Does Apple Have One?
Apple Watch records recovery data but does not combine it into one score. See which signals matter and how Body Insights builds a daily recovery read.
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Athlytic App: Apple Watch Recovery and Exertion Guide
See how the Athlytic app turns Apple Watch data into Recovery and Exertion scores, what Apple provides, and which setup fits your goals.
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Pacing App for Apple Watch: ME/CFS Energy Guide
Use Apple Watch and Body Insights to pace ME/CFS with heart rate, HRV, sleep, and daily capacity. Spot lower-budget days before you overdo it.
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Apple Watch Recovery: When to Push, Rest, or Recover
Apple Watch does not show one recovery score. Learn how HRV, resting heart rate, sleep, and training load can guide whether to push or rest.
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Apple Watch Rest Day: Pause Rings and Recover
Need an Apple Watch rest day? Pause Activity rings without losing your streak, then use sleep, HRV, and resting heart rate to decide when to ease off.
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HRV and Chronic Illness: What One Reading Means
HRV can be noisy with chronic illness. Learn why one low reading is not failure and how to use personal trends, sleep, and symptoms for context.
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Pacing Before a Crash: Signs You Are Overdoing It
See how pacing before a crash uses earlier Apple Watch changes in HRV, resting heart rate, sleep, and activity to help you adjust sooner.
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HRV, Stress, and Sleep: What to Check First Today
See how HRV, stress, sleep, and resting heart rate fit together, and learn which signal to check first when one reading changes today.
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Body Battery vs Recovery Score: Know the Difference
Body Battery estimates energy available now. Recovery scores show how well you bounced back. See why they can disagree and which number to use.
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Apple Watch Getting Sick Signs: What Changes First
Apple Watch can show higher resting heart rate, lower HRV, wrist temperature changes, and broken sleep before symptoms. See which patterns matter.
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Apple Watch vs Oura Recovery: Sleep and Readiness
Compare Apple Watch vs Oura for recovery, sleep, readiness, battery life, and comfort. See which device fits your daily tracking needs.
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How Fast Am I Aging? Read Your Apple Watch Trend
How fast am I aging? Your Apple Watch cannot give a lab biological age, but it already records one evidence-backed read on your pace of aging.
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Long COVID Heart Rate: Spikes, POTS, and Pacing
Long COVID heart rate can be fast, low, or jumpy. Learn what Apple Watch can show, what it cannot diagnose, and when to seek medical care.
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Oura vs Apple Watch for Recovery and Readiness
Compare Oura vs Apple Watch for recovery, readiness, sleep, battery life, comfort, and workouts. See which wearable fits your priorities.
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Best WHOOP Alternative for Apple Watch (No New Band)
Use the Apple Watch you already own as a WHOOP alternative. Compare recovery, strain, sleep, subscriptions, and what a dedicated app adds.
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Sleep Age Chart: What Apple Watch Data Can Show
Apple Watch does not show a native Sleep Age. See what its sleep stages can reveal, how sleep changes with age, and why your own trend matters most.
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Apple Watch Heart Rate Recovery by Age: What It Means
Apple Watch records Cardio Recovery after workouts. See how age affects the one-minute drop, where to find it, and why your trend matters.
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Body Battery App for iPhone: Apple Watch Energy Guide
Compare Body Insights with Garmin, then see how Apple Health records build a 0 to 100 Body Battery reserve on iPhone and Apple Watch.
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Deuterium and Cancer: Heavy Hydrogen and Cell Growth
See how deuterium and cancer research connects heavy hydrogen with cell growth, mitochondrial energy, and the limits of current evidence.
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Deuterium and Diabetes: The Cellular Energy Link
See how deuterium and diabetes research connects heavy hydrogen with cellular energy, mitochondrial function, and blood sugar control.
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Fitness Age on Apple Watch: Find Yours for Free
Apple Watch records Cardio Fitness but does not show Fitness Age. Find your VO2 max, calculate Fitness Age free, and track it in Body Insights.
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Deuterium and Mitochondria: ATP and Energy Explained
See how deuterium can affect mitochondria through the kinetic isotope effect, ATP synthase, and energy production, and what research shows.
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Fitness Age vs Real Age: Is Yours Older or Younger?
Your real age counts birthdays. Fitness age compares your VO2 max with age-based norms. See what an older or younger result means and calculate yours.
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Pacing for Chronic Illness: Protect Your Energy
Learn how pacing for chronic illness protects your energy envelope, reduces crash risk, and uses Apple Watch changes to guide a lighter day.
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Real App Store reviews.
What Apple Watch users say after downloading Body Insights.
★★★★★
Perfect for us chronically ill peeps
"This is the app I’ve been needing. I have an Apple Watch, but had been considering getting a wearable through Visible to help with pacing. Now, I don’t need to do that. Body Insight has all the information I need to make sure I’m pacing myself properly to avoid a flare. Super affordable subscription too! The only thing missing that I wish it did… show insights from my glucose testing. I don’t have a CGM, but stick test frequently."
★★★★★
This app SAVED my life!
"It showed my cardio fitness implied i was 36 years older than my actual age. And falling. Doctors found two heavily blocked arteries which are now handled. If not for this app and Apple cardio fitness alerts, i may not have literally survived 2025."
★★★★★
This app has become indispensable
"I reviewed this app a year ago, but I wanted to come back to say that this app has become part of my daily routine. Completely indispensable - I cannot fathom how I lived without it. The data and what it presents is all so helpful, and the user interface is clean, clear and beautiful. This app should be on everyone’s Home Screen if you have an Apple Watch."
★★★★★
Agréablement surpris
"Je cherchais une application permettant de démultiplier les fonctions de santé d’Apple, et là j’ai découvre cette application gratuite et fonctionnelle, un grand bravo au développeur et continuez comme ça."
★★★★★
Best app for Fitness
"Simple and perfect app. Shows all necessary metrics at a glance 👍"
★★★★★
Looking forward to the weights
"It’s the best one I encountered recently. I’m really looking forward to the next version, especially for the coming weights."
★★★★★
Good and clean
"Very clean app with good insights. Coach advice feature is very helpful. Looking forward to future updates!"