The Belle Ring
Your cycle, understood beautifully. Track temperature, sleep, recovery, and cycle patterns in a ring designed to feel like jewelry, not a dashboard.
Order Belle Ring See how it works
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Rose Gold · Silver Titanium — $299
The reading
Not scores. A pattern. Temperature, HRV, sleep, and recovery change with hormonal rhythm. Belle reads them together, against your own cycle.
Follicular · day 9 baseline shifts with estrogen The same readiness score means something different here than it does late-cycle.
+0.18° shift trend, not one night Small overnight changes are read against the phase arc before Belle calls them unusual.
+38 min late-cycle recovery When progesterone rises, more rest can be a pattern instead of a problem.
86 ready strain interpreted Recovery is compared with your hormonal rhythm, not a male-default baseline.
Train early · sleep first pattern becomes action Readings resolve into a plan for the day — inside the Belle app.
Menstrual Days 1–5
Follicular Days 6–13
Ovulation Days 14–16
Luteal Days 17–28
Menstrual · Days 1–5
Rest is part of the pattern. Belle watches temperature, heart rhythm, and recovery as your cycle begins, so low-energy days read as information rather than failure.
grounded · warm · restorative
Temperature settling Recovery trending down
Follicular · Days 6–13
Energy comes back online. As sleep and HRV improve, Belle helps you see the window where effort, focus, and recovery usually feel easier.
renewal · clarity · momentum
HRV rising Recovery 84 · ready
Ovulation · Days 14–16
A subtle shift, made visible. Belle looks for the temperature and pulse patterns that often surround ovulation, then presents them clearly without overclaiming.
clear · bright · precise
Temp shift +0.32° Window likely
Luteal · Days 17–28
Plan for the days before. When sleep need, stress sensitivity, and temperature change, Belle gives you earlier context for the days that used to arrive without warning.
calm · protective · reflective
Sleep need +40m Stress sensitivity higher
The names
Built for what you're living with. PMDD PCOS Endometriosis Perimenopause Fertility & TTC Chronic conditions All conditions + Green optical sensor continuous heart rhythm
Red + infrared PPG blood-flow & pulse patterns
NTC thermistor skin-temperature trends
PPG — skin temperature — motion
The sensors
Eight ways to listen. Belle reads the body from the inside of the ring, then turns those measurements into trends you can understand without studying charts.
Skin temperature overnight trends Heart rate & HRV recovery patterns Sleep duration and rhythm Movement daily effort Cycle context phase-aware interpretation The app
From readings to guidance. Temperature, sleep, recovery, and cycle context come together as one calm recommendation.
Day 14 Ovulation ovulation likely readiness high
+0.32°vs your baseline
A clear thermal shift often follows ovulation. Belle reads it nightly while you sleep.
7h 42mdeep 22% · REM 24%
Your luteal nights tend to run lighter, so Belle suggests an earlier wind-down.
Next periodin 9 days · confidence high
Forecasts sharpen as Belle learns your rhythm, cycle after cycle.
Your temperature shift and steady HRV suggest ovulation is likely.
Plan high-effort work today; Belle will watch recovery overnight.
The promise
Your body data should belong to you. Belle is designed around consent, clarity, and control from the first day you wear it.
Protected by default Your health data is encrypted in transit and at rest.
Delete anytime Remove your history when you choose.
Never sold Your cycle is not an advertising profile.
The app it pairs with
Already on her hand. ★★★★★ 4.8 · the Belle app on the App Store
← →
★★★★★
“Belle is the best PMDD app so far that has made me feel seen, heard and not crazy!” kellysmccormack · App Store · March 2025 ★★★★★
“It really makes you feel understood as you're struggling and provides many facets of support.” StephNicole12345 · App Store · January 2025 ★★★★★
“I finally understand my cycle patterns so much better & feeling like getting in control, thank you!!!” Shaoens · App Store · October 2025 ★★★★★
“I love that I can write notes to myself when I am follicular to help my mindset when I am luteal ❤️” Ematt87 · App Store · November 2025 ★★★★★
“I also really like the breathing exercises, meditations and journaling prompts. I feel really supported by this app.” Helen Didymus-True · App Store · August 2024 ★★★★★
“The design is simple and easy to navigate even when you're feeling over-stimulated.” Katie Alice Hutchon · Google Play · September 2025 ★★★★★
“The resources and options are endless, and the language is kind.” Alicen Roberts · Google Play · July 2024 Most members see their cycle pattern within two months of logging. Belle Cycle · in-app data, 2025
The fitting · $299
Choose yours. In your Belle Ring
Belle Ring in rose gold titanium Belle Sizing Kit, free — your size confirmed before the ring ships 8 sensors reading temperature, heart rate, HRV, sleep and movement The Belle app — free, and no subscription is required for the ring 4.2 g · waterproof to 5 m · battery up to 7 days Finish Rose Gold Titanium Silver Titanium
Size Your free sizing kit ships first. Your ring follows as soon as you confirm.
Fit me with the kitRecommended
I already know my Belle size
Belle Ring · Rose Gold $349 $299
Sizing kit Free Discount code Total $349 $299 You save $50 Shipping calculated at checkout
HSA / FSA eligible Secure payment by Stripe Every ring ships new The second opinion
Don't take our word for it. Ask an AI. ChatGPT, Claude, and Perplexity are a click away — see what they make of Belle Ring.
The questions
Everything else, answered. Signals App & privacy Ordering Wearing What does Belle Ring track? 8 sensors read skin temperature, heart rate and HRV, sleep and movement — interpreted together against where you are in your cycle, as a pattern rather than isolated scores.
How is this different from other smart rings? Your readings are compared with your own hormonal rhythm rather than a male-default baseline, so a luteal HRV dip reads as luteal — not as a bad week.
Can it diagnose PMDD, PCOS or endometriosis? No. Belle offers wellness insights — patterns and trends, not medical diagnosis. What it can do is give you, and your clinician, a clear cycle-aligned picture to work from.
Still deciding? Feel free to reach us at hello@bellehealth.co .
The beginning
The ring is ready when you are. Start with your finish, then we will guide sizing and delivery from there.
Choose your finish — $299
Free sizing kit if you need one · no subscription required · ships within 48 hours
