HOW OLDIS YOUR BODYREALLY?
An estimate built from Apple Watch VO₂max, resting heart rate, HRV, sleep and steps, plus seven quick lifestyle questions. Every factor shows exactly how many years it adds or takes away.
Change a habit.
Watch the number move.
Pick your answers. The lifestyle coefficients are the ones the app uses; the body signals are fixed to a sample profile.
Transparent
to the last year.
Your body, from Apple Health
Cardio fitness carries the most weight. VO₂max is smoothed over months, so one noisy watch reading can't swing the result.
- VO₂max against a norm for your age and sex, capped at ±6 years
- Resting heart rate and HRV as 30-day medians
- Average sleep and daily steps over the last 30 days, plus weekly workouts
Seven questions, answered once
Smoking, alcohol, diet, stress, social ties, caffeine and family longevity. Change an answer any time and see its effect straight away.
- Contributions add up exactly to the headline number
- Confidence shown as low, medium or high
- A Hub card with a ±10-year scale and a 6-month trend
Every coefficient
has a source.
Kodama et al., 2009
Cardiorespiratory fitness and mortality, JAMA. About half a year per VO₂max point away from the norm.
Jouven et al., 2005
Heart rate profile and long-term risk. Each beat above 60 bpm adds a little, within a ±3-year cap.
Cappuccio et al., 2010
Sleep duration and mortality follow a U-shape: 7–8.5 hours is the sweet spot.
Paluch et al., 2022
Daily steps and mortality: from under 3,000 steps (+2.5 years) to 10,000 and more (−2 years).
AHA Life's Essential 8
Smoking, diet, sleep and activity weighted with conservative, rounded coefficients from cohort studies.
Fully deterministic
The same inputs always give the same result, computed on your device. Nothing is sent anywhere.
NOTEBiological age in Riseform is an estimate for self-tracking, not a medical diagnosis and not a prediction of lifespan.
Questions,
answered.
Is this a medical test?
No. It's an estimate for self-tracking based on published research, not a diagnosis.
Do I need an Apple Watch?
For the most accurate result, yes: VO₂max comes from the Watch. Without it the estimate uses your other signals and answers, with lower confidence.
Why does my result change slowly?
VO₂max is smoothed over months on purpose, so a single noisy reading doesn't move your biological age.
Are my answers shared anywhere?
No. Your answers stay on your device.
On your device.
Nowhere else.
There is nothing to sign up for, not even an email. Open the app and train.
No ads, no analytics, no third-party SDKs. App Privacy on the App Store: Data Not Collected.
Optional sync through your own private iCloud, plus .gymbak backups and full XLSX export.
YOUR GYM.
YOUR RULES.
YOUR DATA.
Offline. Private. No accounts required.
Built for iPhone, iPad and Apple Watch. iOS 26+. Zero third-party dependencies.