01WORKDAY STRESS
Understand stress.
Find time to reset.
Recognize demanding moments. See when a breathing break may help.
Daytime StressTODAY
A demanding day.
A moment to reset.
Elevated
9 AM12 PM3 PM
Your day in moments
CIRCUL RING
CIRCUL RING 3
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1 Year Warranty
30 Days Returns
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PRODUCT FEATURES
- Adaptive-Fit Design for 24/7 Comfort: Reengineered for CIRCUL 3, the new two-segment design adapts to natural changes in finger size within the adjustment range of your selected size, helping maintain a comfortable, secure fit throughout the day.
- Ultra-Thin Titanium Design: At approximately 2.23 mm, CIRCUL 3 is our thinnest ring yet. A refined titanium design combines continuous sensing and Adaptive Fit in a lighter everyday form.
- Sleep Tracking & Nighttime Breathing: Tracks sleep stages, Sleep Debt, overnight blood oxygen trends, respiratory rate and nighttime breathing patterns to give you a clearer picture of your sleep and overnight recovery.
- Heart Rate, HRV & Health Trends: Tracks heart rate, resting heart rate, HRV, RMSSD, SDNN, heart rhythm, temperature trends and BP health trends, with long-term trends to help you understand changes over time.
- Daily Recovery & Body Resilience: See Daily Recovery, Stress Radar, Resilience and long-term HRV trends together, helping you understand when your body is ready to push and when it may need more recovery.
- Real-Time HRV Biofeedback & Guided Breathing: Follow a guided five-minute breathing session while CIRCUL tracks HRV-related signals, then review your physiological response when the session ends.
- Women’s Health & Cycle Insights: Connect menstrual cycle patterns with temperature, HRV, heart rate and sleep to better understand how different signals change together throughout your cycle.
- Automatic Activity Tracking: Automatically recognizes daily activities, tracks workouts and monitors exercise heart rate, with less manual logging.
- Up to 7 Days. No Monthly Subscription: Get up to 7 days of ring battery life* under supported conditions. Included CIRCUL health and wellness insights require no monthly subscription.
SPECIFICATIONS
- Material
- Titanium
- Profile
- Approx. 2.23 mm*
- Width
- 6.8 mm*
- Weight
- Approx. 2.5–3.5 g*
- Fit
- Dual-Segment Adaptive Fit
- Starting sizes
- XS / S / M / L / XL / XXL
- Total coverage
- Approx. US 5–14.5*
- Optical sensing
- Tri-wavelength PPG — Green / Red / Infrared
- PPG sampling
- Up to 100 Hz during sleep*
- Sensors
- PPG / Temperature / Accelerometer
- Water resistance
- 10 ATM*
- Battery
- Up to 7 days*
- Charging
- Charging dock included
- Compatibility
- iOS / Android
- Connectivity
- Bluetooth
- Subscription
- None required
*Dimensions, weight and fit coverage vary by ring size. Battery life depends on ring size, settings and use. PPG sampling rates vary by operating mode. Water resistance depends on use conditions.
Produktinformation
# 30-tägiges Rückgaberecht
Sie können innerhalb von 30 Tagen nach Erhalt Ihres Circul Smart Rings eine Rücksendung beantragen. Bitte beachten Sie, dass die Rücksendekosten grundsätzlich vom Nutzer zu tragen sind.
1. Bedingungen für vollständige und teilweise Rückerstattung
Wenn eine der folgenden Bedingungen erfüllt ist, erfolgt eine Rückerstattung (abzüglich der tatsächlichen Versandkosten):
• Szenario Eins: Volle Rückerstattung
- Ungeöffnetes Produkt: Produktverpackung und Siegel bleiben im Originalzustand, ohne Auspacken;
- Geöffnet, entspricht aber neuen Standards: Obwohl das Produkt ausgepackt und verwendet wurde, gibt es keine Anzeichen von Gebrauch oder Beschädigung, sämtliches Zubehör (Ladeetui, Handbuch usw.) und Geschenke sind vollständig und es fehlen keine Teile, die Verpackung hat nur geringfügige Öffnungen, die den Wiederverkauf nicht beeinträchtigen, und es gibt keine Funktionsstörungen, die durch menschliche Bedienung verursacht wurden.
• Szenario Zwei: Teilrückerstattung
Wenn das Produkt verwendet wurde und die folgenden Bedingungen erfüllt, kann eine teilweise Rückerstattung beantragt werden:
- Das Produkt funktioniert normal und weist nur geringfügige Gebrauchsspuren auf, die den Wiederverkauf nicht beeinträchtigen;
- Originalzubehör, Verpackungen und Geschenke sind größtenteils vollständig;
- Keine offensichtlichen Beulen, Farbverluste, Kratzer oder andere optische Schäden.
Die Rückerstattungsprozentsätze lauten wie folgt:
- Leichte Abnutzung (Produkt intakt, keine Kratzer, voll funktionsfähig): 80 %–90 % Rückerstattung;
- Geringe optische Abnutzung: 60–80 % Rückerstattung.
2. Nicht erstattungsfähige Situationen
In den folgenden Fällen erfolgt keine Rückerstattung:
- Starke äußere Abnutzung: Das Produkt weist deutliche Kratzer, Beulen, Farbverlust oder andere Mängel auf, die den Wiederverkauf beeinträchtigen;
- Funktionsstörungen: Störungen, die durch menschliche Einflüsse verursacht werden, wie etwa Herunterfallen, Wasserschäden oder unsachgemäße Verwendung;
- Fehlendes oder beschädigtes Zubehör : Originalzubehör oder Geschenke gehen verloren oder werden beschädigt, was die vollständige Rückgabe beeinträchtigt;
- Inoffizielle Modifikationen: Selbstdemontage, Modifikation oder Probleme, die durch die Verwendung nicht offizieller Zubehörteile verursacht werden;
- Deutliche Gebrauchsspuren: Das Produkt weist deutliche Langzeitbeanspruchung auf, die zu Leistungseinbußen oder natürlicher Abnutzung führt;
- Personalisierte/reduzierte Artikel: Produkte, die auf der Produktseite deutlich als „vom Umtausch ausgeschlossen“ gekennzeichnet sind, einschließlich personalisierter Artikel oder Werbeprodukte;
- Nach Ablauf der Rückgabefrist: Rückgabeantrag wird mehr als 30 Tage nach Erhalt gestellt.
3. Rückgabeprozess
- Für die Rücksendung können Sie einen Antrag über Ihre Bestellung einreichen oder sich an den Kundendienst wenden, um die Rücksendeadresse und die Vorgehensweise zu erfahren.
- Wählen Sie bei der Rücksendung des Produkts bitte einen nachverfolgbaren, versicherten Versand und bewahren Sie die Sendungsverfolgungsnummer zur Überprüfung auf.
4. Rückerstattungsabwicklung
- Bestellungen, die für eine vollständige oder teilweise Rückerstattung in Frage kommen, werden innerhalb von 5 Werktagen bearbeitet;
- Wir ziehen die Überholungsgebühren und Versandkosten entsprechend dem Rückerstattungsprozentsatz ab und erstatten den Restbetrag über die ursprüngliche Zahlungsmethode zurück.
- Bei Bestellungen, die mit Gutscheinen oder Geschenkkarten bezahlt wurden, wird die Rückerstattung auf Grundlage des tatsächlichen Zahlungsanteils berechnet.
5. Besondere Hinweise
- Die Kosten der Rücksendung trägt grundsätzlich der Benutzer;
- Bei Problemen mit der Produktqualität können Benutzer nach Überprüfung mit einem gültigen Nachweis eine Erstattung der Versandkosten beantragen.
- Circul behält sich das Recht vor, den Inhalt dieser Richtlinie an tatsächliche Umstände anzupassen und wird die Benutzer über offizielle Kanäle über Aktualisierungen informieren.
# Austausch
Wenn das gelieferte Produkt im Originalzustand und unbenutzt ist, Sie es aber gegen eine andere Größe oder Farbe umtauschen möchten, empfehlen wir Ihnen, eine Rücksendeanfrage zu stellen und eine neue Bestellung aufzugeben. Sie tragen alle mit der Rücksendung verbundenen Kosten. Sofern die Rücksendung nicht auf Mängel, Schäden oder Nichtkonformität zurückzuführen ist, werden Versand- und Bearbeitungsgebühren sowie gezahlte Steuern nicht erstattet.
# Erstattung
Eine vollständige Rückerstattung bedeutet, dass Sie den Gesamtbetrag Ihrer Bestellung zurückerhalten, wenn Sie das Produkt gemäß unseren Rückgaberichtlinien zurücksenden.
Sie haben möglicherweise Anspruch auf eine teilweise Rückerstattung, wenn:
-
Bei der Überprüfung der Rücksendung stellen wir Schäden, Verunreinigungen, Abnutzungserscheinungen oder fehlende Teile fest. Sofern diese Mängel nicht bereits in Ihrem Rücksendeantrag angegeben wurden, behalten wir uns das Recht vor, den Wertverlust von Ihrer Rückerstattung abzuziehen.
-
Sie haben Produktpakete oder Geschenke erhalten. Für eine vollständige Rückerstattung empfehlen wir Ihnen, alle Artikel des Pakets zurückzusenden. Sollten Sie die Artikel nicht zurückgeben können, ziehen wir den entsprechenden Betrag von Ihrer Rückerstattung ab.
Bitte beachten Sie: Sie tragen alle Kosten im Zusammenhang mit der Rücksendung des Produkts, es sei denn, die Rücksendung erfolgt aufgrund von Mängeln, Schäden oder Nichteinhaltung der Vorschriften und Sie haben entsprechende Fotos und Beschreibungen bereitgestellt.
Bearbeitungszeit für Rücksendungen oder Umtausch
Bei Rückgabeanfragen, die unseren Richtlinien entsprechen, veranlassen wir die Rückerstattung umgehend nach Erhalt des zurückgesendeten Produkts. Die Rückerstattung erfolgt über die ursprüngliche Zahlungsmethode und kann bis zu 10 Kalendertage dauern.
#Garantieabdeckung für CIRCUL RING
Für alle Originalkomponenten neuer Produkte gilt in Ländern außerhalb des Europäischen Wirtschaftsraums (EWR) eine einjährige und in EWR-Ländern eine zweijährige Garantie. Reklamationen müssen direkt bei CIRCUL unter Vorlage des Kaufbelegs eingereicht werden. Die Garantie gilt für den Erstbesitzer und ist auf nachfolgende Besitzer übertragbar. Bei Schäden aufgrund von Verarbeitungsfehlern repariert, ersetzt oder erstattet CIRCUL den Kaufpreis.
Ausschlüsse von der Garantiedeckung
Die Garantie deckt nicht ab:
-
Unsachgemäße oder fahrlässige Verwendung, Bedienung oder Veränderung.
-
Wartung entgegen der Produktpflegeanleitung.
-
Normale Abnutzung.
-
Wiederaufladbare Batterien haben eine begrenzte Lebensdauer und gelten als Verbrauchsmaterial. Ein Batteriewechsel ist nicht in der Standardgarantie enthalten.
-
Schäden oder Mängel, die durch Unfälle verursacht wurden.
# Erweiterte Garantiebedingungen von Circul Ring
1. Leistungsübersicht:
Mit dem Kauf dieser Garantieverlängerung verlängert sich die Grundgarantiezeit Ihres Smart Rings. Die genaue Dauer richtet sich nach der gewählten Serviceart. Während der Garantieverlängerung profitieren Sie von einem kostenlosen Produktaustauschservice zum gleichen Standard wie während der ursprünglichen Garantiezeit.
2. Geltungsbereich:
Kostenloser Ersatz durch ein neues Produkt ist bei Herstellungsfehlern (einschließlich Sensorfehlern, deutlicher Verschlechterung der Akkulaufzeit, Material- und Verarbeitungsfehlern usw.) und Funktionsstörungen, die bei normalem Gebrauch auftreten, möglich. Probleme, die durch Firmware-Upgrades über die App behoben werden können, sind jedoch nicht von dieser erweiterten Garantie abgedeckt.
3. Ausschlüsse:
Von Menschen verursachte Schäden durch Stürze, Eindringen in Wasser, Quetschungen usw. aufgrund der Nichtbeachtung der offiziellen Betriebsanleitung; Fehlfunktionen durch unbefugte Demontage, Modifikation oder Verwendung nicht offizieller Zubehörteile; optische Abnutzung und normale Alterung von Verbrauchsteilen (wie Ladekabeln) sind alle von der erweiterten Garantie ausgeschlossen.
4. Serviceprozess:
Sollten während der verlängerten Garantiezeit Probleme mit Ihrem Produkt auftreten, können Sie über die offizielle App oder den Kundendienst einen Kundendienst beantragen. Folgen Sie den Anweisungen zur Rücksendung des Produkts. Nach Überprüfung der Produktgarantie erhalten Sie innerhalb von 10 Werktagen ein neues Ersatzprodukt.
5. Zusätzliche Hinweise:
Dieser erweiterte Garantieservice ist nicht übertragbar und gilt nur für den ursprünglich erworbenen Smart Ring. Nach Inkrafttreten des Services werden keine Rückerstattungen mehr unterstützt. Das Unternehmen behält sich das Recht der endgültigen Auslegung und Änderung der erweiterten Garantiebedingungen vor. Die Benutzer werden über alle Änderungen auf offiziellem Wege informiert.
Overview
Real-Time Tracking
Data updates every second.
AI-Powered Sleep Tracking
Understand your sleep stages and overnight patterns.
HRV Biofeedback
Follow guided breathing exercises and see your body's real-time response.
Breathe.Follow the rhythm.
LIVE HRV54ms
Cuff-Free Blood Pressure
Get blood pressure readings, no bulky arm cuff required.
Personal baseline
Ultra-Thin
Adaptive Smart Ring.
A More Flexible Fit. All-Day Comfort.
2.23mmAerospace-grade titanium
BIDIRECTIONAL ADAPTIVE FIT
Long-Term Health Insights
Understand your health patterns over time.
Extended Battery Life
More time wearing. Less time charging.
Up to7days*
Water Resistance
10 ATM protection for everyday wear.
Advanced Optical Sensing
Powered by SST™ Ultra 3.0 sensing technology.
No Monthly Subscription
Your data. No recurring charges.
Cycle Tracking
Track cycle changes through temperature, HRV and sleep trends.
Across your cycle.
NEXT-GENERATION SMART RING FIT
The World’s Thinnest Adaptive Smart Ring
Adapts to your finger's natural changes, keeping sensors close to your skin.
CIRCUL 3 · MADE TO ADAPT01 / 05
Illustrative lifestyle scene
DAILY FIT
Self-Adjusting Fit
Expands and contracts as your finger changes.
Fit, finger choice & gifting
Adaptive Fit accommodates everyday changes within the selected ring size’s range. You can switch between supported fingers when each falls within that range and the ring maintains comfortable, consistent sensor contact.
For a gift, use the recipient’s measurements to choose a starting size. Longer-term body changes, including weight change, may mean checking the fit again.
*Fit varies by finger and starting size. Lifestyle images and the layer view are illustrative and do not represent actual size measurements.
RECOVERY & RESILIENCE
Breathing Coach& Everyday Recovery
Breathe with guidance. Understand stress. Build resilience.
Understand stress.
02ACTIVE BREATHING
Guided breathing.
A moment to reset.
Follow a gentle rhythm: four seconds in, six seconds out.
Breathing CoachGET READY
Make room for a reset.
5:00Find a comfortable seat.Let the pace guide you.
Breathe in4s
GUIDED BREATHING PACE
6breaths/min
Inhale 4s · Exhale 6sSESSION COMPLETE
See How Your Body Responds.
Starting HRV42ms
Ending HRV54ms
A clearer view of your body's response to guided breathing.
Session preview · Example data
03LONG-TERM RECOVERY
Track recovery.
Build better habits.
See how your body responds to stress. Track resilience trends over time.
Body Resilience4-WEEK VIEW
Excellent
Compared with your baselineAdaptation, over time.
CurrentPersonal baseline
HRV (SDNN)88 msRespiratory rate14 brpmResting heart rate55 bpm
Example from CIRCUL InsightExplore insights
Stress is elevated. Make room for a breathing break.
Follow a five-minute session. Let the rhythm guide you.
See how stress and recovery are changing over time.
01 / 03Scroll to explore
Illustrative experiences and data. Individual responses vary.
SLEEP INTELLIGENCE BY CIRCUL AI
AI-Powered Sleep Tracking& Nighttime Breathing
From every second of sleep data to insights that matter.
TO MORNING.
CIRCUL 3 · YOUR NIGHT, CONNECTED
01 / EVERY SECOND
Every second counts.
Oxygen trendsBreathing patterns
1sec
Blood oxygen sampling.
Throughout the night.
Blood oxygen statistics
02:17 AMAverageEstimated events
1-sec samples · replayOVERNIGHT ODI
28.4oxygen dips / hr
Moderate
051530
See every second in the CIRCUL app. Export your report as a PDF.
02 / THE ESSENTIALS, TOGETHER
Your night at a glance.
7h 42mTotal sleep
Sleep debt: 0m
23:0007:00
AwakeREMLightDeep
- Sleep score
- 89Good
- Sleep recovery
- 78
- Avg. blood oxygen
- 90%↓ 5%
- Heart rate
- 55bpm
- HRV · SDNN
- 88.3ms
- Skin temp
- +0.1°C
AI MONTHLY REPORT · OCT 2026
Your month. Made clear.
Sleep score
83
Latest
+13 since 10.01
MONTH TO DATE ·OCT 1–17, 2026.
CIRCUL AI · Monthly insights
Summary
Your weekly average rose from 73 to 79, comparing Oct 1–7 with Oct 11–17, 2026.
Possible factor
Later bedtimes may be shortening sleep on lower-score nights.
Try this week
Keep a steady wake-up time and start winding down 30 minutes before bed.
Illustrative data and AI insights.
EVERYDAY HEALTH
30+ Health Metrics & Insights
Sleep. Recovery. Heart health. Activity. Your cycle.
Sleep Stages
See your awake, light, deep, and REM sleep stages to understand the rhythm of your night and spot subtle changes that may affect sleep quality.
Sleeping Heart Rate
Track your heart rate throughout the night to understand how your body settles into rest and recovers.
Sleep HRV (RMSSD)
Explore subtle changes in the time between heartbeats to understand how relaxed your body is during sleep and how your recovery trends over time.
Sleep HRV (SDNN)
Track overall heart rate variability throughout the night to understand trends in how your body regulates itself.
Sleep Breathing
Follow your overnight breathing rate and rhythm to see how steadily you breathe while you sleep.
Blood Oxygen (SpO₂)
Track your overnight blood oxygen levels and patterns to see how they change while you sleep.
Sleep Movement
Track tossing, turning, and body movement throughout the night to understand nighttime activity and potential sleep disruptions.
Sleep Score
Bring key sleep metrics together in one easy-to-read score for a quick look at how well you slept.
Recovery Score
Wake up with a clearer sense of how ready your body is for the day ahead.
Sleep Debt
See your accumulated sleep shortfall and understand how much more rest you may need.
Sleep Skin Temperature
Follow your overnight skin temperature with its average, highest and lowest readings.
Stress Radar
See how stress changes throughout your day, with a clearer view of your body’s signals.
Guided Breathing
Follow a structured breathing rhythm to relax your body and mind and gradually ease tension.
Breathing Rhythm
HRV analysis automatically identifies your personalized breathing rhythm, designed to help you relax and ease stress.
Breathing Session Insights
Compare heart rate and other signals before and after each breathing session to understand your body’s relaxation response.
Daily Activity
See how close you are to today’s activity goal and how much more movement you need to reach it.
Daily Steps
Track every step and keep your daily activity goal in sight.
Activity Intensity
Track time spent at different activity levels to see how much you move each day and how you’re progressing toward your activity goals.
Recorded Session
Review each workout’s duration, steps, calories and average heart rate.
Activity Tracking
Track your workout heart rate, steps, and intensity, with a clear record of every session.
Blood Pressure
Compare calibrated blood pressure estimates with your usual readings.
Daily Heart
Follow your heart rate throughout the day to understand how your body responds during activity, rest, and sleep.
Resting Heart Rate
Follow changes in your resting heart rate to understand your body’s rest and recovery trends.
Heartbeat Rhythm Map
See how the time between one heartbeat and the next relates to the following interval, revealing patterns in your heartbeat rhythm.
Heartbeat Interval
Explore changes in the time between heartbeats and how those intervals are distributed for a clearer picture of your heartbeat rhythm.
Heart Status
Bring heart rate and rhythm patterns together in an easy-to-read status level, helping you understand changes in your body and keep track of your heart health.
Body Resilience
Follow how your body adapts to stress and recovers over time, with a clearer view of your long-term health trends.
HRV (SDNN)
Track changes in your HRV against your personal baseline built over multiple days to understand your body’s overall regulation and long-term health trends.
HRV (RMSSD)
Compare RMSSD with your personal baseline built over multiple days to follow long-term relaxation and recovery trends and spot changes worth a closer look.
Average Sleep Breathing Rate
Compare your average breathing rate each night with your personal baseline built over multiple days to understand breathing stability and spot longer-term changes worth noting.
Average Sleep Resting Heart Rate
Compare your average resting heart rate each night with your personal baseline built over multiple days to follow overnight recovery trends and spot changes worth noting.
Sleep Heart Rate Trend
Follow second-by-second heart rate changes throughout the night alongside longer-term trends to understand your overnight recovery patterns and spot changes worth a closer look.
Sleep Breathing Rate Trend
Follow second-by-second breathing rate changes throughout the night alongside longer-term trends to understand your breathing rhythm and stability and spot changes worth noting.
Period Tracking
Record period days to follow your cycle over time.
Period Forecast
Plan ahead with an estimate of when your next period may start.
Cycle Temperature
Follow skin temperature changes alongside your cycle.
More Coming Soon
More women’s health insights are on the way.
App examples from different records. Charts are simplified illustrations. Individual patterns vary.
Sleep Apnea Risk Assessment provides risk-related context and is not intended to diagnose sleep apnea.
CIRCUL APP
Your Health, All in One Place.
Sleep, recovery and everyday health. Connected in one app.
01 / 02
Daily overview
Recovery, sleep and activity, with your daily health snapshot.
App screen previews · Sample data from different dates.
Sun, Oct 18
OptimalResilience is optimal. SDNN is below baseline; RMSSD is near usual.
Sleeping heart rate is low, with steady breathing.
GoodGood sleep quality. Sleep was shorter and later than usual, but efficient.
Sleep stages were balanced, with little overnight movement.Stable
StableRecovery is stable, with lower sleeping heart rate and strong HRV.
Shorter sleep limited overall recovery.Good
GoodAverage and lowest HR were slightly below usual; maximum was typical.
HRV stayed strong. Brief increases did not change the overall good pattern.Balanced
BalancedTemperature stayed in your usual range, with only small, brief changes.
2.23 MM TITANIUM SMART RING
Ultra-Thin Titanium. Liquid Light Finish
Jewelry-inspired titanium. Made for everyday wear.
CIRCUL 3 / DESIGN STUDY
Drag to rotate the ring
LESS, IN EVERY DIMENSION
2.23mm*
2.23 mm Ultra-Thin Design
A slimmer profile. A lighter feel for everyday wear.
6.8 mm*Refined width
2.5–3.5 g*Light on your hand
A Smart Ring You’ll Want to Wear Every Day.
Slim titanium. A smooth inner surface. Designed for comfort from work to sleep.
Liquid Light Finish.
Subtle reflections. A refined feel.
Advanced Sensing. Deeper Insights.
Heart, temperature, and motion sensors work together to reveal deeper insights into your sleep, recovery, and daily activity.
Compare
Smart Rings
The details that make a daily difference.
Swipe to compare
| Category | Feature | CIRCUL 3 | Oura Ring 5 | RingConn Gen 3 | Ultrahuman Ring PRO |
|---|---|---|---|---|---|
| Design & fit | Design & fitAdaptive fit | Adapts as your finger changesHidden Six-Spring Mechanism with Controlled Motion |
Not supported. Fixed size |
Not supported. Fixed size |
Not supported. Fixed size |
| Wearing comfort | Adaptive Fit— Comfortable, Secure & Pressure-Relieving |
Fixed Fit— May Feel Too Tight or Too Loose |
Fixed Fit— May Feel Too Tight or Too Loose |
Fixed Fit— May Feel Too Tight or Too Loose |
|
| Primary Inner Surface Material | Titanium Alloy |
Titanium Alloy |
Epoxy Resin |
Titanium & Hypoallergenic Plastic |
|
| Dimensions | DimensionsThickness | 2.23 mm |
2.28 mm |
2.3 mm(at thinnest point) |
2.65 mm |
| Width | 6.8 mm |
6.09 mm |
6.8 mm |
Approx. 8.2 mm |
|
| Sleep monitoring | Sleep monitoringSampling rate | High sample rate 100 Hz |
Not confirmed or disclosed for this feature. Not Disclosed |
Not confirmed or disclosed for this feature. Not Disclosed |
Not confirmed or disclosed for this feature. Not Disclosed |
| Heart rate resolution | 2-Second Intervals |
Supported. 5-Minute Resolution |
Supported. 2.5 Minutes |
Not confirmed or disclosed for this feature. Not Confirmed |
|
| Respiratory rate monitoring | Breath-by-Breath Tracking |
Supported. Nightly Average |
Supported. Nightly Average |
Not confirmed or disclosed for this feature. Not Confirmed |
|
| HRV | HRVHRV metrics | RMSSD · SDNN · Lorenz plot |
Supported. RMSSD |
Supported. RMSSD |
Supported. RMSSD |
| Stress, recovery & resilience | Stress, recovery & resilienceBreathing training | Supported with Biofeedback(Breathing rate, HR, HRV) |
Supported. Supported with Biofeedback(HR, HRV) |
Not supported. Not supported |
Supported. Supported |
| Stress & recovery | Stress Radar · Daily Recovery |
Supported. Daytime Stress · Readiness |
Supported. Stress & recovery insights |
Supported. Stress Rhythm |
|
| Resilience | Body Resilience— Personal Baseline & Long-Term Physiological Trends |
Supported. Stress Resilience— 14-Day Stress & Recovery Balance |
Not confirmed or disclosed for this feature. Not Confirmed |
Not confirmed or disclosed for this feature. Not Confirmed |
|
| AI | AIAI insights | CIRCUL AI |
Supported. Oura Advisor |
Supported. AI health companion |
Supported. Jade AI |
| Battery & pricing | Battery & pricingRing battery | Up to 7 days* |
6–9 daysVaries by size & use |
11–14 daysVibration off; 10–12 days on |
Up to 15 daysTurbo ~12; Chill 15+ |
| Price · USD | $239*Current launch plan |
From $399Finish-dependent pricing |
From $349 |
$479PRO Charging Case included |
|
| Subscription | $0 / monthNo monthly fee |
$5.99 / monthUS membership · $69.99 / year |
$0 / month |
$0 for core featuresOptional paid PowerPlugs |
CIRCUL 3 — Lighter. Stronger. Smarter. A Better Fit.
| Category | Feature | CIRCUL 3 | CIRCUL 2 MAX |
|---|---|---|---|
| Design & fit | Design & fitFit Technology | Next-Generation Adaptive Fit |
Adjustable Fit |
| Design | Hidden Six-Spring Mechanism with Controlled Motion |
Classic Four-Direction Expansion Mechanism |
|
| Material | Aerospace-Grade Titanium Alloy |
316L Stainless Steel |
|
| Weight | 2.5–3.5 g— Approximately 50% Lighter |
5.6–7.1 g |
|
| Width | 6.8 mm |
8.8 mm |
|
| Thickness | 2.23 mm |
2.6–3.3 mm |
|
| Wearing Comfort | Lightweight, Comfortable & Protrusion-Free |
Flexible Fit |
|
| Structural Strength | 3× the Structural Strength of CIRCUL 2 Max |
Previous-Generation Design |
|
| Health tracking | Health trackingHeart Rate Monitoring | Supported |
Supported |
| HRV Monitoring | Supported |
Supported |
|
| Blood Oxygen Monitoring | Supported |
Supported |
|
| Sleep Tracking | Supported |
Supported |
|
| Recovery & insights | Recovery & insightsBreathing Training | Supported |
Not Supported |
| Health Insights | Advanced Recovery & Body Resilience Insights |
Essential Health Trends |
|
| Everyday use | Everyday useWater Resistance | 10 ATM Certified· Enhanced Sealing Design |
5 ATM |
| Battery Life | Up to 7 Days |
Up to 7 days*Continuous tracking mode |
|
| Membership | No monthly fees |
No subscription required |
CIRCUL 3 highlightAvailableNot supportedNot confirmed
Comparison notes & sources
An x beside “Not Disclosed”, “Not confirmed”, “Not specified” or “To be confirmed” means this feature or specification has not been disclosed or verified. It does not mean the product lacks the feature. CIRCUL 3’s purple icons highlight its features; they do not claim every feature is exclusive.
* Sampling rate applies during sleep and is not the app refresh rate. Tracking depends on the enabled mode and supported conditions. Dimensions and battery life vary by size, settings and use. RingConn lists 10–12 days with vibration on; Ultrahuman battery life varies by mode.
Risk assessments and BP-related trends provide wellness context, not medical diagnoses or direct blood pressure readings.
Prices are in USD and vary by finish and configuration. CIRCUL 3’s $239 price reflects the current launch plan. Ultrahuman offers optional paid services.
Battery life varies by ring size, settings and use. CIRCUL 2 MAX battery life is stated for continuous tracking mode.
WHAT THIS MEANS
THE DETAILS
CIRCUL 3 Tech Specs
The essentials, down to the details.
Design & fit
- Material
- Titanium
- Surface
- Liquid Light finish*
- Fit
- Dual-Segment Adaptive Fit
- Fit coverage
- Approx. US 5–14.5*
Sensors
- Optical
- Green · Red · Infrared PPG
- Temperature
- Temperature sensor
- Motion
- Accelerometer
- Sampling
- Up to 100 Hz during sleep*
Battery & charging
- Ring battery
- Up to 7 days*
- Charging dock
- Included
App & connectivity
- Phones
- iOS & Android
- Connection
- Bluetooth
- Companion app
- CIRCUL App
- Membership
- $0 / month
What's in the box
CIRCUL 3 × 1
Magnetic Charging Base × 1
USB-C Charging Cable × 1
Quick Start Guide × 1
Still Got Questions?
Browse our FAQs to learn more.
What is CIRCUL 3?
CIRCUL 3 is CIRCUL’s latest adaptive smart ring, designed to help you understand your health patterns and practice recovery.
How does CIRCUL 3 compare to CIRCUL 2 MAX?
CIRCUL 3 brings a lighter, slimmer titanium-alloy design and next-generation adaptive fit for everyday comfort. It retains CIRCUL 2 MAX’s heart rate, HRV, blood oxygen and sleep tracking, while adding breathing training and advanced recovery and Body Resilience insights. Water resistance also increases from 5 ATM to 10 ATM.
What is HRV Biofeedback breathing?
It combines guided breathing with feedback on your body’s response, so you can observe how your physiology changes during a session.
What does Body Resilience mean?
It describes longer-term patterns in how your body adapts to challenges, recovers, and maintains balance. It is a wellness trend, not a medical assessment.
What does Circul AI do?
Circul AI is designed to turn your health data and personal patterns into insights that are relevant to you. It supports understanding your wellness trends; it is not a medical diagnostic tool.
Does Circul 3 provide medical diagnosis?
No. Circul 3 is for general wellness and is not intended to diagnose, treat, cure, or prevent any disease.
Does Circul 3 require a subscription?
No. Circul 3 does not require a recurring subscription.
How long does the battery last?
Battery life is up to 7 days. Actual battery life varies by ring size and model.
How water-resistant is Circul 3?
Circul 3 is rated 10 ATM.
This product has no reviews of its own. The merchant grouped it with related products, so the reviews shown are from across that group.
M
La bague Circul ring 2 max est super le système d’ajustement pour le doigt est très bien car jusqu’à présent j’avais la ring de chez oura mais difficile de trouver la bonne taille pour mon doigt et en plus pas d’abonnement.
D
I received my Circul Max 2 approximately 1.5 months ago and am in love with it. The app is so easy and gives you tons of information. I look forward to every morning, taking my blood pressure and reviewing my nights sleep. The adjustment is perfect. I am very active for 74 and between arthritic knuckles and swelling and shrinking, the ring is a perfect fit every time. I highly recommend!!
A
Initially I wasn't sure if I would like to wear a smart ring on my pointer finger but, given how it adjusts in size, I've found it to be comfortable. I've had my Circul Ring 2 Max for a few months now and no longer notice I'm wearing it. I also find the data it collects to be in-depth. I haven't learned what all the acronyms, etc. mean but I find the information collected about my health helpful. My only suggestion to share would be more specific tips. I seem to see the same tips each day so feel like they may be generic.
K
I appreciate that the Circul team pays close attention to their users' suggestions. This new model largely addresses the shortcomings of the original Circul Ring 2. It is definitely worth considering for purchase right now.
V
Love it! I can adjust it as I wish without worrying about moving it to another finger, can adjust it to whichever is best for me at the time, love the finishing details on the material and color, shipping could have be n faster but I cannot complain, will definitely buy another for my significant other.
G
Just got my ring last night and used the sleep apnea tracker and am impressed with all the data it provides. I am going to continue wearing it so that the ring adapts to my body and health to improve accuracy but am already happy with the data that I am getting! I do wish there was an option to switch the daily tracking intervals from every 10 minutes to 5min or lower. I would sacrifice battery life to be able to do that and do not mind having to charge it more often. I also wish there was a smart alarm option to wake you up at the best sleep stage. I can't wait for new updates and further improvements to come!
S
I've been wearing it for a couple of weeks and I must say that its functions have impressed me in a very positive way. The ring returns a lot of information on health and the results are of impressive precision. I had the opportunity to compare it with professional medical instruments and the ring returns a lot of information on health and the results are of impressive precision. Maximum rating more than deserved. But if I really have to be honest, the only real problem encountered is the support for the different languages. We are in 2025 and it is unthinkable that such a precise tool is important for our health supports only English or a little more and this in my opinion greatly limits the sale of the ring. But apart from this small negative note, the ring does 100% what it promises at a much lower price than the competitors.
A
I’m very impressed with the Circul ring. I have never left a product review before, this is how impressed I am! I have an autoimmune connective tissue disorder and sleep apnea, so accurate sleep and oxygen tracking was very important to me. Moreover, my fingers get puffy and swollen, and the Circul ring adapts to it. The oxygen measurements are the same as those of a medical-grade finger sensor! The app works seamlessly and the customer service is amazing. I think this is one of the best purchases I have ever made, considering the price and the accuracy of the product.
I’m happy with my purchase. The size fits all my fingers (a little loose on the pinky), and I’ve been using it daily with no issues—the tracking works well. Whether I’m washing my bike or doing the dishes, the ring continues to function and charge properly. I also like the flexibility of being able to swap it between fingers.
My only wish is that it could connect with other apps, such as Clue, similar to how the Oura ring does. Overall, it looks great on my fingers and I’m very satisfied.
K
This ring is everything I was looking for! The sizing was super easy, and it fits 8 of my 10 fingers. After the initial getting used to wearing a ring on my index finger {my finger of choice) it is quite comfortable. The continuous heart rate and SO2 monitoring is great, but my favorite thing by far is the sleep tracking. I was told I have sleep apnea many years ago, but ignored it. Eventhough I felt like garbage I never contributed it to sleep apnea. But the Circul ring has apnea monitoring that comes free with the ring and it made me admit that I had a problem. I started using my CPAP again and I feel great! I would have never done that had it not been for this ring.
The only negative I can think of is that the battery life, since I do use the apnea setting nightly. I have to charge it every day, but the charging case is so convenient that I can just toss the whole thing in a purse and put the ring back on when the green light flashes.
I would highly recommend this ring to absolutely everyone! I finally feel like I am taking control of my health, and this ring is definitely a key player!
L
I'm absolutely loving my Circul Ring. I got it in the space grey colour which i love. The size small fits my index, middle and ring fingers perfectly if I need to switch between fingers throughout the day. The adaptive fit is amazing and it's very comfortable. I have several health issues so I love that I can monitor my health around the clock. The blood oxygen, temperature, sleep apnea, etc are what are import to me with all of the other features. The real time monitoring is amazing! I'm looking forward to new updates etc and can't wait to see what you have in store for the near future. Thanks Circul Ring for making my health monitoring so much easier! Best money I've ever spent.
H
Awesome a ring that can take Bp readings !
G
Everything from sales to delivery was excellent
H
The adjustable design is incredibly useful, it fits four of my fingers, and on my index finger it’s so comfortable I can barely feel it’s there.
The sleep tracking is great! Even picking up on my naps. I was a bit worried about battery life before, but it really lasts 5–6 days with all-day wear, and the charging case is also convenient.
5 out of 5 stars. Looking forward to seeing more activity modes added!
S
I’m glad they replaced my defective Circul ring and made some great updates! I really like that it now monitors heart rate, oxygen saturation, stress, steps, sleep, HRV, skin temperature, and even sleep apnea. Such a cool and powerful device packed into a small ring!
C
It does what was advertised
A
I have to say the BP function matches my BP monitor almost exactly, it one the the features that seperates the Circul from the rest. Sleep monitoring is another great feature and wroks jsut as well. I get at least 5 days out of a charge.
C
This ring has been great with tracking my heart rate for Afib and sleep apnea. With that said, grabbing my dogs leash the other day caused the ring to shoot across the back yard. Otherwise this ring is amazing, for me.
P
I’ve had my CIRCUL 2 MAX for a little over 7 months now and I can’t say enough good things about it, it does take a little time to calibrate to your specific metrics. But I wear it on the same side as my 🍎and the numbers are within close proximity. The only logical reason for the difference is I have to charge the other device more frequently and I forget to put it back on!! Love love love my C2M, buying one for the wifey‼️
A
Amazing ring. Amazing data. Really informative, accurate. Works alongside my Garmin for my triathlon training. I can only give it 5 stars, but data, battery life, and flexible adjustable band works really well. Well done
