Invisible on your hand
A lightweight titanium ring instead of a bracelet — monitoring you can't see or feel.
01WITU Ring
Discreet 24/7 monitoring
For when you'd rather wear nothing on your wrist. The ring accurately tracks sleep, HRV and temperature — while staying a piece of jewelry.
Pricefrom $249
Launch — 2026 Q4
Why WITU Ring
5 sleep stages
Accurate detection of sleep stages, sleep latency and sleep quality from nighttime heart rate and movement.
02Nighttime HRV
Overnight heart rate variability — the foundation of your morning Recovery Score.
03What it measures
Sleep5 stages+ latency
HRV24/7nighttime focus
SpO₂Saturationnighttime monitoring
TemperatureSkinbaseline
ActivityStepsaccelerometer
Specifications
- Body
- Titanium / Silver / Gold / Platinum
- Sensors
- PPG optics, NTC thermistor, IMU
- Battery life
- 5–7 days
- Charging
- In the case, ~45 minutes
- Sizes
- US 6–13 (sizing kit)
- Protection
- Water-resistant — shower, pool
- Connectivity
- Bluetooth 5.3 LE
- Warranty
- 2 years
Find your ring size
Rest your finger on the screen and find the circle that fits — just like a jeweller's gauge set. Calibrate the screen with a bank card first: pixel density differs on every display.
01
Calibrate your screen
Hold any bank card against the screen and drag the slider until the rectangle matches the card exactly.
Hold your card here
02
Measure
Easiest: lay your finger on the screen. Got a ring handy? That's even more accurate.
Rest your finger on the circles — right on the screen. Find the one your finger fills snugly without pinching, and tap it.
The circles are drawn at true physical size — the same gauges a jeweller uses. Rest your finger where you'll actually wear the ring and hold the screen straight in front of you. Between two circles? Take the larger one.
03
Your size
Tap the circle that fits your finger.
Full size chart
| Size | Inner diameter, mm | Circumference, mm |
|---|---|---|
| 7 | 17.9 | 55 |
| 8 | 18.3 | 57.5 |
| 9 | 19.2 | 60 |
| 10 | 20 | 62.8 |
| 11 | 20.9 | 65.4 |
| 12 | 21.6 | 67.8 |
| 13 | 22.4 | 70.4 |
| 14 | 23 | 73 |
Who WITU Ring is for
Anyone tracking sleep and recovery
Minimalists who'd rather skip a wrist gadget
As a jewelry companion to the WITU bracelet
For calm, 24/7 background monitoring
WITU is a wellness device, not a medical device
Insights are provided for general wellness and informational purposes only and are not intended to diagnose, treat, or replace professional medical advice. If you have any health concerns, consult a qualified healthcare provider.