Effortlessly track your sleep apnea with precise monitoring. The smart ring detects breathing irregularities and provides valuable insights into your sleep quality—no additional devices required.
Next-level Accuracy of Health Metrics
Born from 10+ years of medical research, CIRCUL has evolved through four generations of refinement, each iteration smarter, lighter, and more precise than its predecessor.
No Subscriptions. Free Full Monitoring
Enjoy full monitoring without any subscriptions or hidden fees. Get lifetime access to all features with just a one-time purchase.
Exclusive Free VIP Health Reports
$0/mo
(free for a limited)
One-time purchase, lifetime access.
Utilizes anomaly detection algorithms to promptly identify potential health risks.
Continuously tracks data to generate detailed health reports.
Exclusive WEB personal data center.
Empower Your Health, Restore the Earth. For every order we:
Measure and confirm your ring size following the guide below.
Step1
Take a length of floss or string and wrap it around the base of your finger.
Step2
Mark where the floss or string first overlaps with a pen.
Step3
Stretch the length of string out along a ruler or measuring tape, and take down the length in millimeters
Step4
The length you measured is the circumference of your finger, compare the circumference of your finger the following table.
Circumference(mm)
Product information
Warranty Coverage for CIRCUL RING All original components of new products are covered by a one-year warranty in non-European Economic Area (EEA) countries and a two-year warranty in EEA countries. Claims must be made directly to CIRCUL with proof of purchase. The warranty applies to the original owner and is transferable to subsequent owners. If damage is due to craftsmanship defects, CIRCUL will repair, replace, or refund.
Exclusions from Warranty Coverage The warranty does not cover:
Improper or negligent use, operation, or modification.
Maintenance contrary to product care instructions.
Normal wear and tear.
Rechargeable batteries, which have limited lifespans and are considered consumable items. Battery replacement is not included in the standard warranty.
World's First Smart Ring to Conquer Space - Blue Origin's Trusted
Blue Origin passenger Professor Jim Kitchen
"CIRCUL+ joined Blue Origin's NS-20 mission in March 2022, as Professor Jim Kitchen chose our 1st generation smart ring to track his vital signs data in space—for his UNC classroom."
(no longer available on Apple Watch units sold by Apple in the United States since January 18, 2024)
SpO2 Continuous Measurement
(with SpO2 Trend Graph)
Heart Rate Data Update Interval
1 second
>10 mins
>10 mins
/
Blood Oxygen Saturation Update Interval
1 second
>10 mins
>10 mins
/
Exercise Heart Rate Update Interval
1 second
(Accuracy close to a chest strap)
Several Mins
Several Mins
/
Features
Sleep Apnea Analysis
Heart Rate Variability(HRV)
Detailed HRV Report
Single Metric: RMSDD
Single Metric: RMSDD
SDNN, RMSSD metrics
Resting Heart Rate(RHR)
(result by calculation)
Exercise Heart Rate
Sleep Analysis
Real-Time Sleep Monitoring&Detailed sleep report
Comprehensive sleep tracking
Comprehensive sleep tracking
Basic sleep tracking
Stress Management
Blood Pressure
Coming Soon
Long-term health reports
(Identifies potential health issues, can be shared with your doctor)
WEB personal data center
Standards
Design Standards
Medical-Grade
Consumer-Grade
Consumer-Grade
Consumer-Grade
*The comparison data may change over time. Features, specifications, and performance are subject to updates. Please verify with the respective manufacturers for the most accurate and up-to-date information.
Achieves millisecond-level accuracy, continuously analyzing heart rate variability, which is invaluable for evaluating overall health and stress levels.
Continuous SPO2 Monitoring
Offers real-time tracking with second-level updates help users to assess respiratory health.
Heart Rate Monitoring
Updates data every second with an accuracy of ±2 bpm, providing highly accurate heart rate information to help users promptly identify cardiac health abnormalities.
Temperature Monitoring
Achieves an accuracy of ±0.1°C, updating every minute to quickly detect temperature anomalies, especially during menstrual cycle tracking and flu seasons or pandemics.
Sleep Apnea Monitoring
Sleep Apnea Detection: Capable of identifying the risk of sleep apnea, aiding in the early detection of potential sleep issues.
Comfortable 24/7 wear
Lightweight design, support for sleep wear, provide complete sleep data
Detailed sleep report
Real-Time Sleep Monitoring: Thoroughly analyzes sleep stages, including light, deep, and REM (rapid eye movement) sleep, offering detailed sleep quality reports to help improve sleep habits.
High-Precision HRV Monitoring
Achieving millisecond-level accuracy, providing continuous analysis of heart rate variability, which is invaluable for assessing overall health and stress levels.
Offers de-stressing and relaxation recommendations based on stress data.
Multiple Exercise Modes
Supports monitoring up to 5 types of activities, such as running and cycling
Real-Time Data Feedback
Tracks exercise heart rate during workouts, providing real-time data and post-exercise analysis to help optimize performance.
Achieve Your Activity Goals
Whether you're a runner or yoga lover, CIRCUL is designed to help you achieve your activity goals. With over 5 sports modes, it provides real-time heart rate feedback and detailed post-workout analysis. 90% of users report significant progress.
Exercise Heart Rate Monitoring
Provides real-time updates every two seconds, supporting heart rate tracking across various activities such as running, swimming, and cycling.
Always Alert. Always Protecting
CIRCUL watches over you 24/7. Detecting arrhythmias and oxygen dips in real-time. Day or night, it's your silent guardian. Catch potential issues early. Stay ahead of your health.
Health Trend Reports, Archived
More than numbers. ClRCUL reveals your wellness story.
Heart rate trends. Sleep patterns. Stress insights. All in one comprehensive, shareable report. Empower your choices. See your health clearly.
“The adjustable size was important to me because my fingers sometimes swell, making other rings uncomfortable. I appreciate that this company has experience with smart rings and FDA approval, which should ensure better quality than newer brands.”
Gavin Hall
Medical Scientist
“My biggest problems with rings is the size. Finally, someone has invented the Smart ring that I can actually wear. My ex football teammates will be quite happy. Nobody has small finger joints that most fit rings over! Thank you!!!!”
Charlie Martin
Medical Scientist
“I’ve been looking for the RIGHT smart ring for some time now, this ring checks all the boxes for me. I’ve struggled with high blood pressure, rings fitting one day but not the next, so the adjustable size is awesome as well as continuous blood-pressure monitoring! ”
Robert Palumbo
Health and Wellness Coach
“This would be my first smart ring I think it’s the most stylish I’ve seen and I love the flexible design, for the functionality I am really looking forward to the health tracking I have some things that this rings tracking will help me with very much…I think this is why it’s a great product”
Benjamin Shullaw
Corporate Executive
I like the ring because of the flexible sizing and being able to use different fingers. I also wanted one able to show BP and other medical functions. It is a nice looking ring and the colours available are very nice….Shared…
James Lauzier
Freelancer
World's First Adaptive-Fit Smart Ring
Precise as medical equipment. Portable as jewelry.
S/M/M+/L(Covering refers to circumference)
S: 47-54.7mm,corresponding to US code 4-7;
M: 55.6-59.7mm,corresponding to US code 7.5-9;
M+: 60.9-66mm,corresponding to US code 9.5-11.5;
L: 67.5-76mm,corresponding to US size 12-15.5
Net weight
S:5.6g M:6.5g M+:6.8g L: 7.1g
Power source
Internal power supply Built-in 3.8V Li-ion battery
Port
Bluetooth(5.0BLE, operating frequency 2.4-2.4835GHz; Modulation mode : GFSK; Frequency hopping: adaptive frequency hopping)
Please read our FAQs page to find out more. Still have questions ? Contact our customer support.
Is the CIRCUL RING capable of continuously monitoring my health?
Yes, It provides near-medical-grade health data with real-time tracking at second-level intervals, ensuring that critical indicators such as heart rate, real-time blood oxygen, HRV, and blood pressure meet industry-leading accuracy standards.
How long does the battery last?
The CIRCUL RING maintains a battery capacity above 80% after 300 cycles. It features Elite Modes specifically designed for users with sleep disorders or other conditions that require overnight blood oxygen monitoring. In this mode, it provides medical-grade SpO2 monitoring at 1-second intervals. Due to the increased power consumption from these intensive calculations, the battery life in this mode is approximately 3-5 days.
Additionally, the CIRCUL RING comes with a charging case that has an embedded battery, allowing you to charge the ring anytime. Charging time is approximately 60 minutes from 0% to 100%.
What makes Circul Ring different from other smart rings?
CIRCUL RING isn't just another smart ring—it's a revolution in personal health monitoring. As originated from the world's 1st FDA-cleared smart ring, it brings clinical-grade accuracy to your daily life. Our proprietarySST™(Sensor Stabilization Technology) ensures unparalleled data precision, adapting to natural finger size variations of up to 3mm throughout the day.
It provides Near-Medical-grade Health Data with Real-time Tracking at Second-level Intervals, ensuring that critical indicators such as heart rate, real-time blood oxygen, HRV, and blood pressure meet industry-leading accuracy standards.
What metrics does Circul Ring track?
Heart Rate (24/7 Continuous monitoring)
Blood Oxygen Levels (SpO2)
High Precision HRV monitoring
Sleep Apnea monitoring
Temperature
Blood Pressure (coming soon)
Real-time Sleep Monitoring
Exercise Heart Rate
Activity Tracking
Steps and Movement
Energy & Stress
What should I do if my ring not work properly?
Please put it into the charging case, and check if the ring has a blinking light.
Please open the app and check whether the ring can be connected to it normally.
CIRCUL RING
