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The Halo Smart Ring
Free tracking · no subscription
All night
Skin temperature
8 days
Battery
4 g
Titanium
100 m
Water safe
The Halo Ring

THE RING THAT
READS YOUR CYCLE.

Temperature, sleep, recovery, stress, readiness and movement, read continuously while you sleep, plus the signals that move with your blood sugar, and translated by Kai before you wake.

$250 one time · no subscription
60-day guarantee Free shipping Tracking free forever
Choose your color
Choose your size
Sizing guide
Measure at the end of the day, when fingers are largest, and wear it on the index or middle finger of your non-dominant hand. Between sizes? Go up. If the fit is wrong when it lands, the 60-day guarantee covers a free exchange.
Pick a color and size to continue
Kai
Included free
The Conceivable app, all six signals, your full history — no paywall. Kai's AI advising is a separate, optional membership you can try free.
What it reads

SIX SIGNALS, READ FOR
WHAT THEY SAY ABOUT YOU.

Every signal is interpreted for your hormones, not your training load — and each one is a feedback loop that lets Kai check her own work and revise your plan.

Read continuously, all night
Temperature curve
Thousands of readings overnight, from the steadiest sensor position on your body. Reported as a trend, not a number to chase.
Also monitored, 24/7
Continuous heart rate · oxygen saturation · VO₂ max & fitness age · blood-pressure trend · all-day activity. Read from the palm side of your finger, where the pulse is strongest.
One ring, six chapters

CALIBRATED FOR EVERY
PHASE OF YOU.

The only wearable tuned to all phases of women's health. Tap a stage.

Fertility lens
Ovulation, without the 6am alarm.
Patterns, never verdicts.
Last night
Why the Halo

NOT JUST ANOTHER RING.

Feature
HALO
Oura 4
Inito
What women say

WORN EVERY NIGHT.
TRUSTED EVERY MONTH.

Real buyer photos
Real hands, real rings — unedited photos.
Verified buyer wearing the Halo Ring
Sarah M.
Verified buyer
Verified
Verified buyer wearing the Halo Ring
Rachel W.
Verified buyer
Verified
Verified buyer wearing the Halo Ring
Emily R.
Verified buyer
Verified
The risk is ours
WEAR IT TWO CYCLES.
THEN DECIDE.
Sixty days is long enough to see two full cycles of your own data. If it hasn't told you something you didn't know, send it back for a full refund — wrong size included.
Good to know

QUESTIONS, ANSWERED.

General wellness product
The Halo Ring and the Conceivable app are general wellness products intended to support a healthy lifestyle. They are not intended to diagnose, cure, mitigate, prevent or treat any disease or condition, are not a substitute for an FDA-cleared device, and do not replace care from your clinician. All signals are non-invasive estimates and trends — not clinical measurements, and not diagnostic thresholds. If something in your data looks unusual, we will encourage you to talk with your healthcare provider.
The Halo Ring · $250 · 60-day guarantee · Tracking free, forever.
Truemed is for qualified customers. HSA/FSA tax savings vary. Learn more at truemed.com/disclosures.