The app
Your coach in your pocket.
The band collects. The app explains, in plain language, and tells you what to do with the day in front of you.
Thursday · Morning brief
You are ready.
| Score | 82 of 100 |
|---|---|
| Zone | High readiness |
| Meaning | How prepared your body is today, from sleep, resting heart rate and heart-rate variability. |
| Score | 63 of 100 |
|---|---|
| Meaning | How hard your day worked your body — all movement counts, not just workouts. |
Load
63
| Score | 91 of 100 |
|---|---|
| Meaning | How much of the sleep your body needed you actually got. |
Sleep
7 h 42 m
Your body absorbed yesterday well — a hard session lands well today. Lights out by 22:30 keeps the streak.
Today
One screen, once a day
Your morning brief lands before you have finished your first cup: where your Readiness sat overnight, what your Load has been doing across the week, and one specific thing to do about it today.
Readiness
| Score | 82 of 100 |
|---|---|
| Zone | High readiness |
| Meaning | How prepared your body is today, from sleep, resting heart rate and heart-rate variability. |
How prepared your body is today, from sleep, resting heart rate and heart-rate variability.
Last 14 days
| M | 68 |
|---|---|
| T | 71 |
| W | 64 |
| T | 77 |
| F | 82 |
| S | 79 |
| S | 74 |
| M | 66 |
| T | 70 |
| W | 81 |
| T | 85 |
| F | 80 |
| S | 78 |
| S | 82 |
Readiness
How prepared your body is
Built from your sleep, your resting heart rate and your overnight heart-rate variability — measured through the stillest part of the night and compared only to your own fortnight, never to a population chart.
Load
| Score | 63 of 100 |
|---|---|
| Meaning | How hard your day worked your body — all movement counts, not just workouts. |
How hard your day worked your body — all movement counts, not just workouts.
Last 14 days
| M | 41 |
|---|---|
| T | 66 |
| W | 58 |
| T | 72 |
| F | 49 |
| S | 88 |
| S | 34 |
| M | 55 |
| T | 61 |
| W | 70 |
| T | 45 |
| F | 79 |
| S | 52 |
| S | 63 |
Load
Everything your day asked of you
All movement counts, not just the session you logged. The number matters less than the comparison: Load against your own 14-day norm is what tells you a quiet week is secretly a heavy one.
Sleep
| Score | 91 of 100 |
|---|---|
| Meaning | How much of the sleep your body needed you actually got. |
How much of the sleep your body needed you actually got.
Last 14 days
| M | 77 |
|---|---|
| T | 82 |
| W | 68 |
| T | 90 |
| F | 85 |
| S | 71 |
| S | 88 |
| M | 74 |
| T | 92 |
| W | 80 |
| T | 69 |
| F | 87 |
| S | 84 |
| S | 91 |
Sleep
Not hours. Enough.
Kairo works out what your body needed after the day it had, then shows how close you came. Sleep debt is tracked for you, and a smart bedtime shifts a little each night until the gap closes.
Journal · Correlations
What moves your numbers
Based on 84 days of your own data. Correlation is not cause.
Journal
What actually moves your numbers
Log a habit — late caffeine, an evening walk, a glass of wine — and Kairo correlates it against your own scores over time. It will tell you what is working, and it will say plainly when the data cannot tell.
Syncs where you already train.
- Strava
- Google Fit
- Apple Health
- Samsung Health
Get the app
Free with your band
Included with the band and free forever. Download it now — you can explore the app before your band arrives.
- Android 9+ and iOS 15+
- Bluetooth 5.0 or later
- Works offline — syncs when you have signal
- Under 1 MB of data for a full day of syncing
Family and friends
Check on the people you worry about.
Invite someone by phone number. They accept, choose exactly what they share, and can stop sharing at any time from their own phone.
- Heart rate, blood pressure and sleep, if they choose to share them
- A quiet nudge if a reading sits well outside their own normal
- One tap to call — the app never replaces picking up the phone
- Consent is theirs, revocable, and logged
