Sleep & Apnea
There's More to Sleep Than Hours.
Understand sleep stages, overnight oxygen and breathing trends—and whether you need more rest today.
CIRCULLive metrics
SLEEP STAGES
7 h 42 min
Restorative night00:29 — 04:44 · Last night
LIVECIRCUL RING 3
Loading CIRCUL 3…Silver
Blue Origin passenger Jim Kitchen wore our early medical-focused Circul Pro on NS-20 in 2022, collecting health data during his historic New Shepard flight.
Just 2.23mm thin titanium
Designed to Adapt As your finger changes
Up to 7 days On a single charge
No subscription $0 Monthly fee
Adaptive fit. Weightless wear.
Crafted from aerospace-grade titanium.
Light enough to forget it’s there. Refined enough to go anywhere.
2.23 mm Ultra-thin · thinner
Thinner. Stronger. Comfier.
CIRCUL 2 MAX
More Living. Less Charging.
get up to
8 Days
battery life
Up to 8 days of battery life.
Up to 8 days. Battery life varies with ring size, usage and settings.
See Your Body’s Rhythm.
Holistic wellbeing perspective.
It reads your body’s ongoing state, translating quiet biological cues into clear, actionable guidance.
Recovery & Stress
Know When to Push. Know When to Slow Down.
See today's recovery, stress and energy, plus how they have changed over recent weeks.
CIRCULLive metrics
DAILY RECOVERY
82 / 100
Ready for todayCompared with your personal baseline
LIVE
Activity
Every Move Adds Up.
From daily steps to workouts, see activity, intensity and your heart-rate response.
CIRCULLive metrics
ACTIVITY SCORE
93 / 100
Every move adds upDaily movement · Balanced with recovery
LIVE
Heart & BP
See the Patterns Behind Your Heart Rate.
Track daily heart rate and heart-health trends, with deeper detail whenever you need it.
CIRCULLive metrics
DAILY HEART RATE
62 bpm
Steady todayResting range · Consistent with your baseline
LIVEInterwoven Biometrics. Deeper Context.
30+ connected metrics & insights
We combine streams of physiological data with your unique baseline, so metrics mean more together. Wellness insights only; not a medical diagnosis.
Heart Health Index
See your heart’s story at a glance. HR, HRV, and rhythm trends are integrated for a clear, visual snapshot. Quickly grasp how your heart moves through the day.
Heart rate
68bpm
Sleep Recovery Insight
Connect sleep stages, nighttime oxygen and rest patterns with next-day recovery, so you can understand how last night shapes today.
Nighttime Breathing Insights
Review oxygen and breathing patterns for sleep-related trends and possible risk signals. This wellness insight is not a diagnosis.
Cycle Intelligence
Connect temperature, HRV, sleep and recovery trends with your personal baseline to understand patterns across your cycle—without diagnostic claims.
Automatic Activity & Heart Rate
Automatically record supported activities and see heart-rate responses alongside sleep, recovery and daily energy trends.
Blood Pressure Trends
Follow changes against your usual readings as a wellness trend reference. This does not replace clinical testing or a medical blood-pressure monitor.
Activity Management
Bring steps, movement and supported workouts into one view, then connect everyday activity with recovery and long-term patterns.
True Continuous Monitoring & Precision
Continuous HR and HRV tracking captures every nuance of your body’s rhythm. Feel the flow of your day and understand your body like never before. Advanced algorithms ensure each HRV change is captured precisely. Long-term trends are easy to see, letting you feel your recovery and readiness.
Body Energy Score
CIRCUL 3 connects heart rate, HRV, temperature, activity and sleep with your personal baseline for a clearer view of daily energy and recovery.
ADAPTIVE FIT · EVERYDAY COMFORT
Your fingers change.
Your ring adapts.
From morning to night, finger size naturally shifts. CIRCUL 3 adjusts within your chosen size for lasting comfort and a steady, secure fit.
Not tighter. Not looser. Simply adaptive.
Our StoryRead Your Body
Personalized Insight AI
It truly knows you.
Your Morning, Made Clear
No confusing charts. Just one clear health story.CIRCUL 3 benchmarks your sleep, activity and body signals against your personal baseline.Insight AI combines sleep, HRV, temperature and daily data to craft your unique health narrative.
No confusing charts. One clear health story.CIRCUL 3 compares your sleep, activity and body signals with your baseline.Insight AI connects HRV, temperature and daily data into a story unique to you.
AI Insight · Deep health analysis
Sleep × HRV × Temp × Activity × History
Personal baseline · illustrative viewFROM INSIGHT TO ACTION
Stress, Recovery &
Breathing Coach
Real-Time HRV Biofeedback
Most breathing exercises tell you what to do. CIRCUL 3 shows you how your body responds — the signals before you start, the rhythm you follow, the response during the session, and what changed afterwards.
07:40 · before you leave
Start where you are.
CIRCUL 3 reads your resting heart rate and HRV before you begin. Today's session starts from today — not from an average.
Sample data
BRAND EXPERTISE
Expert Perspectives on CIRCUL
CIRCUL PRO · SEPARATE MEDICAL PRODUCT
“The Circul Pro is the only ring oximeter cleared by the FDA and it is accurate in people with all skin tones. Using advanced non-invasive techniques, oxygen saturation is tracked seamlessly throughout the night. The Circul provides valuable data that healthcare providers can review.”
Expert commentary describes earlier CIRCUL products and does not constitute CIRCUL 3 certification or clinical validation.
BRAND TECHNOLOGY HERITAGE
Research & Product Milestones
Earlier CIRCUL achievements, with the applicable product made explicit.
CIRCUL PRO · SEPARATE MEDICAL PRODUCT
FDA-Cleared Ring Oximeter
Professional clearance and SST™ sensing belong to Circul Pro, not CIRCUL 3.
CIRCUL PRO RING · EARLIER PRODUCT
Red Dot Design Recognition
Design awards recognize earlier CIRCUL product work; they are not new certifications for CIRCUL 3.
CIRCUL RESEARCH · BRAND LIBRARY
20+ Published Papers
Research accumulated across earlier CIRCUL technologies and product generations.
Brand technology heritage: these credentials, awards and publications refer to Circul Pro or earlier CIRCUL products where indicated. They do not represent certifications or clinical validations obtained by CIRCUL 3.
MEDIA COVERAGE
CIRCUL in the Press
Selected media coverage across earlier CIRCUL product generations.
