The problem with trackers
TRACKING NEVER
HEALED ANYONE.
Counting your sleep, your steps, your temperature hands you a wall of data you can't act on — and a low hum of anxiety underneath it. Knowing your number doesn't change it. Knowing what to do about it does.
200+
Signals interpreted together
So we built the opposite of a tracker. Patented whole-system interpretation — not a wall of charts.
01 · Interpret
Read the whole system
Temperature alone is a rearview mirror. Cycle, sleep, HRV, stress and recovery become one picture.
02 · Repair
Build a real plan
Kai turns the picture into daily, specific guidance — food, supplements, timing, rest.
03 · Progress
Measure and iterate
Every cycle we compare your signals against your plan and adjust what you're doing.
One ring, six chapters
WHAT IT WATCHES FOR YOU
CHANGES AS YOU DO.
Same ring on the same finger. Completely different job depending on where you are. Tap a stage.
What it reads
CALIBRATED FOR EVERY
PHASE OF YOU.
The only wearable tuned to all phases of women's health — from a first period to postmenopause. Every signal is read for what it says about your hormones, not your training load.
Temperature
97.42 °F · ±0.01°
The sustained overnight rise that follows ovulation — progesterone’s signature, without a 6am thermometer.
Kai uses it to
confirm the shape of your cycle and time the month’s plan around it.
Sleep stages
7h 42 · deep 1h 28
Deep sleep is when hormones are made and cleared. Short nights show up in the next cycle, not tonight.
Kai uses it to
decide whether to push the plan this week or protect your rest first.
Recovery & HRV
62 ms
Recovery is the resource everything else spends. When it drops, your body starts prioritizing survival over rhythm.
Kai uses it to
dial the plan up or down before you feel the crash.
Daily readiness
84 / 100
One honest morning read that folds the night before into a single number you can act on.
Kai uses it to
choose today’s version of the plan — full, light, or rest.
Stress load
Elevated
Sustained strain shifts cycle rhythm before you notice it. Seen early, it is a much smaller conversation.
Kai uses it to
bring Seren in, and soften the week rather than abandon it.
Movement
8,240 steps
Enough movement supports hormone balance; far too much works against it. Context, never a guilt trip.
Kai uses it to
right-size activity for the phase you are actually in.
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 signal is strongest — stronger than the wrist.
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. Kai’s guidance is lifestyle support (food, movement, rest, supplements), not medical advice or treatment. If something in your data looks unusual, we will encourage you to talk with your healthcare provider.
Why the Halo
NOT JUST
ANOTHER RING.
Same finger. Half the price. Wildly different job.
How it's priced
TRACK FOR FREE.
ADD KAI IF YOU WANT HER.
Buy the ring once and track forever. Kai's advising is the only thing that costs extra — and she's free to try.
Comes with your ring
$0 / forever
✓All six signals, always
✓Cycle & ovulation insights
✓Sleep & readiness scores
✓Full history, no paywall
Kai · optional
Membership, when you're ready
✓Personalized supplement packs
✓AI-guided daily plan
✓Nutrition & timing from Olive
✓Cycle-over-cycle progress
You pay for Kai only if you want her advising. Tracking is free, forever, no strings.
How it works
FROM YOUR FINGER
TO YOUR FORMULA.
01
Slip it on
Titanium, feather-light, water-safe. Charge it once and forget it for five days. It starts reading the moment it touches skin.
02
It tracks, free
Temperature, sleep, HRV, stress, readiness and movement flow to the app on their own. No subscription. No paywall. Ever.
03
Add Kai, optionally
When you're ready, Kai reads your signals and builds a daily plan — food, supplements, timing — that evolves every cycle.
Real buyer photos
Good to know
QUESTIONS, ANSWERED.
Do I have to pay a subscription?
No. Buy the ring once and track all six signals — temperature, sleep, HRV, stress, readiness, movement — free, forever. Kai's coaching is the only optional add-on, and you can try her before committing.
How is this different from Oura?
Oura is a general wellness tracker that puts most insights behind a monthly paywall. The Halo is built around your cycle, tracking is always free, it estimates blood-sugar trends no other ring reads — and Kai turns the data into a plan instead of more charts.
Do I need the supplements?
Not at all. The ring and free tracking work beautifully on their own. If you add Kai, she may suggest a personalized pack based on your signals — entirely your choice.
Battery and build?
Titanium body, water-safe to 100m, five-day battery on a single charge. About 4 grams — most people forget they're wearing it within a day.
How do I get the right size?
Use our sizing guide before you order — measure at the end of the day, when your fingers are at their largest. If the fit is wrong when it arrives, the 60-day guarantee covers an exchange.
Is my data private?
Yes. Encrypted end to end, stored on secure servers, never sold or shared. You own your data — period.
PUT IT ON.
WE'LL TAKE IT FROM HERE.
Reserve your Halo and start tracking free. Kai's waiting whenever you want her.
60-day money-back guarantee · Free shipping · Cancel any time
The Halo Ring · Trend-level wellness insights, not a medical device.