Every second, your biological clock ticks. But unlike your birthday — this one can go backwards.
30.000000
biological years
← this number is ticking right now
What you get
Six ways to understand your body
🧬
Vitality Age
Your biological age computed from 5 biomarkers. Younger is better — and it's trainable.
Core Metric
⚡
Readiness Score
Should you train hard or rest today? HRV, sleep, and recovery signals fused into one score.
📊
Training Load
ACWR-based training stress with strength vs. endurance balance. Avoid overtraining.
🔮
What-If Simulator
Drag sliders, see your age change. Explore which habits move the needle most.
📈
Score Drivers
What changed this week and why. Links biomarker shifts to specific behaviors.
🏆
Challenge Friends
Share your Vitality Age. Challenge anyone to beat it. Bragging rights, earned.
The algorithm
Five signals, one age
Weighted model based on the HUNT Study (n=4,631) and published reference data. Dynamic reweighting when signals are unavailable.
42%
VO₂max
18%
HRV
15%
Sleep
15%
HRR1
10%
RHR
Your data, your device
Privacy isn't a feature. It's the architecture.
🔒
No servers
Zero network calls. Your health data never leaves your iPhone. Not even once.
👤
No accounts
No sign-up. No email. No tracking pixels. Install and go.
🗑
Delete anytime
Uninstall the app — everything goes with it. We keep nothing.
Pricing
Your wrist already has the sensors. Why pay rent?
Other apps charge you monthly to read data from hardware you already own. We think that's absurd.
💊 The Others
$30
per month, forever
✖ Proprietary hardware required ($300+)
✖ Your health data on their servers
✖ Cancel and lose everything
✖ "Recovery score" behind paywall
✖ Battery dies in 4 days
✖ Lock-in by design
🏃 PACE
$34.99
once. not per month. once.
✔ Uses the Apple Watch you already wear
✔ All data stays on your iPhone
✔ Core scores free forever
✔ One-time $34.99 unlock. No subscription.
✔ No account needed. Ever.
✔ Built on published science, not vibes
Hot take: Charging $360/year to tell someone their HRV is "low" using a sensor they already paid for is not a business model — it's a hostage situation. PACE costs less than one month of Whoop. And you keep it forever. 🔥