Health and fitness, read continuously
Heart rate, blood pressure, sleep and stress — read around the clock, for you and for the people you worry about.
Worn from Cape Town to Victoria Falls
Beta members
Nights tracked
Average band rating
What Kairo reads
Eleven signals, taken continuously — heart, pressure, oxygen, sleep, stress and cycle — so the picture is your life, not a five-minute appointment.
| Score | 82 of 100 |
|---|---|
| Zone | High readiness |
| Meaning | How prepared your body is today, from sleep, resting heart rate and heart-rate variability. |
Heart-rate variability · Overnight
The quiet signal that tells you whether yesterday cost you more than you thought.
Sleep · Every night
Stages, timing and how much of what your body asked for you actually got.
Last 16 hours
Blood pressure · Continuous, 24 h
Readings around the clock, so you see the pattern instead of one number at a clinic.
Normal sinus rhythm
ECG rhythm reading · On demand
A single-lead trace you can take in thirty seconds and save to share.
| Score | 63 of 100 |
|---|---|
| Meaning | How hard your day worked your body — all movement counts, not just workouts. |
Steps, distance, calories · Continuous
The walking, the standing, the stairs. Everything counts, because it does.
Fertile window · predicted
Menstrual cycle · Daily
Your cycle logged beside your sleep, energy and effort, where it belongs.
Stress · Continuous, 24 h
Where your body sat on the calm-to-pressed scale, hour by hour.
| Score | 97 of 100 |
|---|---|
| Meaning | How much of the sleep your body needed you actually got. |
Blood oxygen · Continuous, 24 h
How well your blood is carrying oxygen while you sleep and while you climb.
Blood pressure
One nervous minute in a clinic can read high. A calm year at home can hide a slow climb. Kairo reads your blood pressure around the clock, so what you see is the shape of your days — mornings, nights, hard weeks — not a single number taken once.
Care from anywhere
Add the people you worry about to your app. You see their heart rate, blood pressure and sleep the way they see yours — because they said yes, and only for as long as they say yes.
For runners
The plan says intervals. Your overnight numbers say hold. Kairo reads how you absorbed yesterday and grades today before you lace up — so hard days land hard, easy days stay easy, and the block builds you instead of burying you.
For the gym
The session breaks you down; deep sleep rebuilds you stronger. Kairo watches both — how hard you actually worked, whether last night did its repair work, and when your body can pay for the heavy day you have planned.
Sleep
Stages, timing, blood oxygen and how much of what your body needed you actually got. Then one instruction at breakfast — usually just a bedtime worth defending.
Women's health
Log your period once and Kairo learns the rhythm — then shows you why week three feels different, when your resting heart rate climbs, and which days your body will thank you for going easier.
Every kind of moving
The session you logged and the six hours on your feet that you did not.
Race day
Strength
Swim
Match dayRoad
First lightFrom signal to instruction
Raw data is not advice. Kairo turns everything the band reads into three scores you can act on before you finish your coffee.
| 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.
+6 vs your 30-day average
How readiness works| 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.
8% above your 14-day norm
How load works| 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.
7 h 42 m of an 8 h 05 m need
How sleep works
05:52 — Morning brief
Readiness 82. Your body absorbed yesterday well — a hard session lands well today.
Load has run 14% above your norm for four days. Keep the effort, watch the week.
Lights out by 22:30 keeps the streak.
One screen, once a day. That is the whole habit.
The band
Nothing to glance at, nothing to buzz. It reads, and it stays out of the way — a week at a time between charges.
One product
In stockOne purchase. The app, every signal and every update come with it — no subscription, ever.
Includes 15% VAT. Ships from Johannesburg — nothing extra at the door.
30-day comfort guaranteeFree courier deliveryMobile money or card
Two years on a subscription tracker
±US$ 500
and still counting
Two years on Kairo
once — then it is simply yours
Typical subscription trackers charge US$20–30 a month for scores and history. Kairo charges nothing a month, for anything, ever.
Member stories
Beta members across the region, in their own words.
I stopped guessing. The brief told me my body had not absorbed Tuesday, so I ran easy on Wednesday — and my Saturday long run was the best in a year.
Two kids under five. I did not need a training plan, I needed to know why some mornings felt impossible. Turns out it was bedtime drift, not my age.
Night shifts wrecked me for years. Kairo showed me the pattern in a fortnight and gave me something to actually change.
The screenless thing sold me. I have enough screens. It sits on my wrist, I forget about it, and the app tells me what matters at breakfast.
Buying it in USD on EcoCash, delivered in three days, with a warranty I can actually claim in Harare. That was the whole decision.
Readiness called my deload week before my elbows did. I pulled back, slept it off, and hit a five-kilo bench PR the next Friday.
I walked into my check-up with ninety days of morning readings instead of a guess. For the first time, my doctor and I were talking about the same thing.
The science
Optical heart sensing, accelerometry and skin temperature are proven at scale. What we obsess over is what those readings mean for you specifically — against your own baseline, never a population chart.
Kairo is a wellness product, not a medical device. We publish validation work when it is finished, and quote no accuracy figures before then.
Read the science
Journal
Half the story of your blood pressure happens where no clinic can see it. Why the pattern matters more than any single number — and how to bring a better one to your next check-up.
03/08/2026 · 6 min read
The plan is written in advance. Your capacity to absorb it is decided night by night. How to run a block by Readiness and Load — and reach the start line ready, not merely finished.
01/08/2026 · 7 min read
The gym provides the stimulus. Deep sleep provides the construction crew. What lifters should actually watch, and what to do on the mornings the crew never arrived.
31/07/2026 · 6 min read
Good to know