Why Ultrahuman
4 reasons to choose the Ultrahuman Ring
No Mandatory Subscription
Every core insight the ring tracks comes included with your ring. No paywall, no membership.
Loved by Researchers
Peer-reviewed publications, white papers, and live research fuel the numbers you see each morning.
Clinical-Grade Accuracy
AFib detection, ovulation confirmation and migraine insights, all built with clinically cleared partners.
Personalized Insights
Explore PowerPlugs – from caffeine window to jet lag, switch on what fits and track what matters to you.
Your data, yours to keep.
You bought the ring, so you get what it reads. Insights on sleep, recovery, stress, movement, and cycle tracking are all included with no monthly subscription – not now, not ever.
Loved by Researchers
Science you can check.
Most wearables cite research. We publish ours. Our algorithms are tested against clinical references, reviewed by scientists, and written up in full – so every score you see has been checked by someone who isn’t us.
Read the Science- 10Peer-reviewed publications
Studies on the ring’s own algorithms, reviewed by independent scientists and published in journals.
- 34White papers
Every method published in full: how each score is calculated, and how we tested it against clinical references.
- 20Active collaborations
Universities, hospitals and labs running live studies on Ultrahuman data right now.
- 2FDA-cleared algorithms
Algorithms that have passed regulatory review beyond our own internal testing.
Clinical grade accuracy
Signals your doctor can use.
The finger carries a stronger pulse signal than the wrist. We read it with algorithms validated against clinical references – what the ring flags is mapped against the very thing your doctor would test you with.
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Afib detection
Checks your heart rhythm while you sleep and flags possible irregularities early. It isn’t a diagnosis – it’s a night-by-night history you can take straight to your doctor.
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Migraine insights
Tracks the sleep, stress, and temperature shifts that tend to show up before your migraines, so you can see one coming and change your day before it starts.
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Cycle and Ovulation Pro
Confirms ovulation instead of predicting it, using your overnight temperature and an FDA-cleared, CE Class IIa partner platform.
Personalized Insights
Your ring, your way. Explore 20+ PowerPlugs.
No two people track the same things. PowerPlugs are micro-tools you switch on in the app, each going deeper into one area and each running on signals the ring already collects. Caffeine window, jet lag, shift work, pregnancy – add what fits your lifestyle and track what matters to you.
Explore all PowerPlugs
Smart Alarm
Wake up at the right moment.
Wakes you in your lightest sleep phase, inside a window you set – so mornings start without the grogginess.
Respiratory Health
Breathing, measured overnight.
Tracks your breathing rate and blood oxygen while you sleep, and flags any changes worth a closer look.
Social Jet Lag
Land on local time.
Builds a light and sleep plan from your circadian rhythm, so you adjust to a new time zone in fewer days.
Circadian Alignment
Live in sync with your body clock.
Maps your body clock from your sleep and temperature – showing you when to focus, train, and wind down.
Screentime
See what late scrolling costs you.
Connects your evening screen time to how well you sleep, so you can see what a late scroll really costs.
Caffeine Window
Know your last-cup cut-off.
Shows when caffeine will still be in your system at bedtime, so your coffee stops costing you sleep.
Vitamin D
Get your sunlight in.
Estimates the vitamin D your body makes from sunlight, based on local UV and the time you spend outdoors.
Shiftwork
Sleep well on any shift.
Builds a sleep plan around your work rotation, so night shifts and early starts cost you less strain.
Pregnancy Insights
Follow the changes, week by week.
Shows how your sleep, heart rate and temperature shift through pregnancy, trimester by trimester.
LES MILLS
Train with LES MILLS.
Guides you through LES MILLS workouts inside the app, with your heart rate and recovery tracked alongside.
Every one of those reasons starts here.
We build the sensor, the ring, and the algorithm that reads it. No subscription, published methods, clinical references, tools you switch on – none of it holds if the hardware and the software come from different places.
Nights of sleep tracked
132,636,993
Frequently asked questions
How does the Ultrahuman smart ring work?
Sensors inside the ring read your heart rate, HRV, skin temperature, movement and blood oxygen day and night. The app compares each reading with your own baseline and turns the changes into sleep, recovery and movement scores.
Does the Ultrahuman Ring need a subscription?
No. Core features are included with the ring. Most PowerPlugs are free; a few built with partners carry a fee.
Can the Ultrahuman Ring measure blood oxygen?
Yes. The Respiratory Health PowerPlug tracks your overnight SpO2 and breathing.
Does it work with iPhone and Android?
Yes. The Ultrahuman app is on the App Store and Google Play, and you can sync data with Apple Health.
Can I shower or swim with the ring?
Yes. Ring AIR is water resistant up to 100 meters, so you can shower or swim with it. Avoid keeping it submerged for more than 30 minutes at a time. See the ring care guide.
How long does the battery last?
Ring AIR lasts about 4-6 days per charge. Ring PRO lasts up to 15 days. Here’s how to maximise battery life.