No subscription, ever
Wake up knowing exactly how you slept.
The Kiro KR1 tracks sleep, heart rate, HRV and stress around the clock from 3.6 grams of titanium — and never charges you a monthly fee to see your own data.
$0
Subscription fees
5–7 days
Battery per charge
3.6g
Titanium build
5ATM
Water resistant
The ring
Kiro KR1
Three finishes, US sizes 7–13, and bundle pricing when you kit out the household. Full specs, photos and customer reviews live on the product page.
View the product pageSix sensors. One ring. Zero excuses.
Sleep that finally makes sense
Full sleep stages plus naps, scored every morning with a readiness rating you can act on.
24/7 heart rate & SpO₂
Continuous optical sensing tracks resting heart rate and blood oxygen through the night.
Stress & recovery via HRV
HRV trends show when your body is ready to train and when it needs a lighter day.
3.6g of titanium
Lighter than a paperclip, with a brushed finish that reads as jewellery, not gadget.
5–7 days per charge
Drop it on the magnetic dock while you shower. No ports, no cables to line up.
5ATM waterproof
Showers, pools and the gym are all fine. Wear it and forget it.
The app
One score to plan your day around.
Every morning your ring hands you a readiness score built from last night's sleep, resting heart rate and HRV. Push hard on the green days, back off on the amber ones — and share progress with the people who keep you accountable.
- Nightly sleep score with stage-by-stage breakdown
- Resting heart rate, SpO₂ and HRV trends over time
- Steps, calories and activity goals in one view
- Every feature free — no premium tier
Why pay monthly for your own body?
Most smart rings lock sleep and recovery data behind a subscription. Kiro doesn't.
Questions, answered
Better sleep starts tonight.
Free tracked shipping, 30-day returns and a 1-year warranty. No subscription to cancel later.
Order now