82
Ready to push
Readiness
A 0–100 score built on your personal baseline of HRV, sleep and recent load. With the why always in view.
For people who train by listening to their body
Knows when to push. And when not to.
Strato reads what your watch already measures — HRV, sleep, load — and every morning sums it up in an honest readiness score: real data against your own baseline, never made up.
For iPhone, with Apple Watch or any watch that writes to Apple Health.
9:41
Today
Readiness
82
Ready to push
HRV above your baseline and a full night of sleep.
HRV
64ms
+6 vs your average
Sleep
7:40
86% quality
Load
412
balanced week
Last workout
Easy run · 48 min
Zone 2 most of the time
VO₂max 469,480 steps2,310 kcal
Today
Trends
Log
Profile
Real data, never made up
If a night of sleep is missing, you’ll see an honest gap and an explanation. Never an estimate dressed up as a measurement.
Your health, only on your iPhone
Metrics are read from Apple Health and processed in memory. They never touch a server, a database, or analytics.
No guilt-tripping red
Zone 5 is intensity, not an alarm. Strato explains; it doesn’t scold you for resting or push you to train broken.
Accessible by default
Dynamic Type and Reduce Motion respected on every screen. The big numbers are meant to be read, not deciphered.
What it measures
All your physiology, on one calm screen
Every morning, Strato compares your metrics against your own baseline — nobody else’s — and tells you what they mean today.
Sage
64 ms
Heart rate variability (HRV)
Your nervous system, in milliseconds. A nightly series with your normal band: you’ll know whether today you’re above or below what’s normal for you.
Lavender
7:40
Sleep
Duration, quality and the timeline of the night. If your watch recorded nothing, Strato says so clearly instead of filling it in.
Sand
412 · balanced week
Training load
How much training stress you’re accumulating and how it’s spread across the week. The basis for not overdoing it — or falling short.
And the rest of your day
- VO₂max
- Steps
- Active energy
- Resting HR
- Respiratory rate
Approximate is labeled approximate. Always.
Your workouts
Every session, explained
A full history with honest detail: time in zones, heart-rate curve and a comparison against your average from the last 30 days.
Zones that make sense
From rest to max, with your own heart-rate ranges. The top zone is deliberate intensity, not a red alarm.
- RestZ0–1recover
- EasyZ2aerobic base
- AerobicZ3sustainable pace
- ThresholdZ4hard effort
- MaxZ5full intensity
The detail that matters
- Time
- 48:12vs 42:30 average
- Load
- 86vs 71 average
- Avg HR
- 146vs 151 average
- Energy
- 520 kcalvs 470 average
Every workout is compared against your 30-day average, so a big day reads as what it is: a big day, not a system failure.
Privacy
What happens on your wrist stays on your iPhone
Strato is built on a simple rule: your health data is not our business.
Health data, in memory only
Health metrics are processed in RAM and vanish when you close the app. They’re never written to disk or synced.
No accounts, no cloud
No sign-up, no profile on a server, no copy of your data outside your device.
Analytics never touch health
No health data ever feeds product metrics or third parties. Period.
You read it, you delete it
Strato only reads from Apple Health with your permission, which you can revoke anytime from Settings.
Strato reads data from your watch. It is not a medical device and does not replace advice from healthcare professionals.
Frequently asked questions
What do I need to use Strato?
An iPhone and a watch or band that writes its data to Apple Health: Apple Watch, Garmin, Polar, Suunto, COROS… If your metrics are in Health, Strato can read them.
What happens if I don’t wear my watch one night?
You’ll see an honest gap with an explanation (“this night’s data is missing”), and the readiness score will tell you what it was calculated from. Strato never fills gaps with made-up estimates.
Where is my health data stored?
On your iPhone, inside Apple Health, just like now. Strato reads it with your permission, processes it in memory and never sends it to any server.
How is it different from the Health app or my watch’s app?
Strato brings together what you already measure into one daily reading compared against your own baseline: readiness, HRV, sleep and load on a single screen, explained in plain language.
Will there be an Android version?
Later on, via Health Connect. The first version is for iPhone.
When does it launch?
It’s in active development. Join the waitlist and we’ll let you know when it reaches the App Store — no spam, just that one heads-up.
Coming soon to the App Store
Be among the first
Leave us your email and we’ll let you know when Strato reaches the App Store. No newsletters: one heads-up, and that’s it.
We’ll only use your email to tell you about the launch.