Six things your body does while you are not looking.
Each one is measured overnight and through the day, then turned into one number you can act on.
Sleep
How you actually slept
Phases, duration and interruptions, scored into a single number you see the moment you wake up.
Recovery
Whether to push or rest
Overnight heart rate and variability say more about today than how you feel at 7am.
Heart
Your resting baseline
A resting rate measured night after night, so a change shows up as a change and not as noise.
Activity
Movement that counts
Steps, calories and sport sessions, started from the ring without unlocking anything.
Stress
Load you can see
Heart rate variability through the day makes a heavy week visible before it becomes a bad one.
Cycle
Women's health
Cycle reminders alongside the rest of your data, on a ring you can wear in any setting.
A display, on a ring
Lumina Ring Pro Display
Advanced health intelligence with a built-in touch display.
$54.99In stock
Medical-grade sensors in a ring you can wear all day and all night. Your metrics stay on your finger and sync to the app when you want them.
Long-lasting battery
8-10 days on standby, 3-5 in normal use. Full magnetic charge in 90 minutes.
Bluetooth 5.2
Low-energy, high-speed sync with your phone, and a find-my-ring signal in range.
Camera gesture control
One finger gesture fires your phone camera - hands-free photos and video.
Women's health & family
Cycle reminders and shared health data for the people you care about.
IP68 waterproof
30-day returns
Secure checkout
Good morning
84
Sleep score
7h 42m · 3 interruptions
Resting heart rate
54bpm
HRV
62ms
Steps this week
8,240
In the app
Numbers, not a wall of charts.
The ring measures all night and syncs in seconds. What you get in the morning is a handful of figures that tell you whether to push today or take it easy.
No subscription. Every reading is free, for as long as you own the ring.
Works offline. The ring stores your nights and syncs when you open the app.
iOS and Android. Any phone with Bluetooth 5.0 or later.
days between charges - so the nights it is measuring are the nights you sleep normally.
Manufacturer rating, standby use.
90 min
Full charge
IP68
Water resistance
0
Monthly fee
Ring or watch
The one you actually keep wearing.
A tracker only works on the nights you wear it. That is the whole argument for a ring.
The one you actually keep wearing.
Criterion
Smart ring
Smartwatch
Fitness band
Comfortable to sleep in
Yes
No
Yes
Battery between charges
8-10 days
1-2 days
5-7 days
Invisible in a meeting
Yes
No
No
Fits under a glove
Yes
No
No
Monthly subscription
None
None
Sometimes
Screen notifications
No
Yes
Yes
Survives the shower
Yes
Yes
Yes
A comparison of device categories in general, not of any particular model.
The essential one
Smart Ring Classic
Everything you need to track, without a screen on your finger.
$39.99In stock
Activity, sport, sleep, steps and calories. Wireless camera control and multiple sport modes, in black or silver, sizes 7 to 14.
Sleep and recovery
Phases, resting heart rate and HRV, measured every night you wear it.
Multi-sport modes
Steps, calories and sport sessions across multiple tracking modes.
Wireless camera control
Trigger your phone camera from the ring, no screen needed.
iOS and Android
Compatible with both, in eight sizes and two finishes.
Eight sizes
Two finishes
Secure checkout
How it works
Simple to set up and use
Four steps from the box to your first night of data.
01
Choose your size
Measure a ring you already wear, or follow the size guide on the product page. Between two sizes, go up.
02
Charge it up
Drop the ring onto the magnetic charger that comes in the box. A full charge takes about 90 minutes.
03
Pair with the app
Install the free app, hold the ring near your phone and it connects. No account and no subscription.
04
Wear it and forget it
It tracks quietly day and night and syncs the moment you open the app. Recharge roughly once a week.
Questions
Before you buy
Measure a ring you already wear and compare it with the size chart on the product page. If you fall between two sizes, choose the larger one - a ring that is slightly loose still reads correctly, one that is too tight does not.
The Pro Display adds a built-in touch screen on the ring itself, so you can read your metrics without your phone. The Classic tracks the same core data - sleep, heart rate, steps, calories and sport modes - and shows it all in the app.
Yes. Both rings are IP68 rated, so showering, washing up and swimming are fine. Avoid sauna heat and hot tubs, which are outside the rating.
Eight to ten days on standby and three to five in normal daily use. A full charge on the magnetic dock takes about 90 minutes.
No. The app is free and every feature keeps working for as long as you own the ring. There is no monthly fee and nothing is locked behind a paywall.
Any iPhone or Android device with Bluetooth 5.0 or later. The ring stores your data on board and syncs whenever you open the app, so it does not need to stay connected all day.
No. The ring is designed for wellness and fitness tracking. It is not a medical device and its readings should not be used to diagnose or treat any condition - speak to a doctor for that.
You have 30 days to return an unworn ring in its original packaging. Write to us and we will send you the return instructions.
Owners
What people say
A ring with a display—not only beaut
iful but also extremely useful and intuitive to use!! Amazing
Roberta Bazzoni
09/23/2026
It's very practical and works well. I took a size 7, but I recommend going up a size. Otherwise, the app is perfect, very practical, and I really like the family connection.
