Circular Ring 2 — AI-Powered Health Lab on Your Finger
Circular Ring 2 merges elegant jewelry design with advanced health tracking, monitoring 140+ biosignals across 13+ features, including ECG, sleep, activity, recovery, and AI coaching. Subscription-free with upcoming premium features like blood pressure and glucose trend tracking, it delivers precision in every detail and clarity in every insight. With Kira, your AI health coach, Circular Ring 2 turns 140+ biomarkers into clear, actionable recommendations—helping you make smarter decisions, optimize your health, and become a stronger you.
As Seen on CES 2025!
Smart health meets elegant design
-
Medical-Grade Precision: The first ECG-like smart ring delivering precise, actionable health data on your finger
-
Advanced Health Tracking: Monitors 140+ biosignals across 13+ health features, including ECG, sleep, activity and recovery.
-
Comprehensive Health Companion: Tracks energy, heart rhythm, stress, coherence, VO₂ max, and more for smarter wellness decisions
-
AI-Powered Insights: Kira analyzes your biomarkers daily, delivering real-time, actionable recommendations to optimize health
-
Subscription-Free Experience: All core features work without recurring fees; premium metrics like blood pressure and glucose trends coming soon
-
Sleek & Durable Design: Expertly crafted from premium titanium, weighing just 2 grams for all-day comfort
-
Hypoallergenic Interior: Finished with a durable PVD coating protecting it from scratches & wear
13+ advanced health features
-
ECG + AFib Detection: Track your heart rhythm with the world's first medical-grade technology and catch signs of arrhythmia before symptoms appear
-
Kira™ Coaching: Your AI health coach turns complex data into clear, actionable tips tailored to your lifestyle
-
Sleep Tracking: Monitor sleep stages, breathing & oxygen levels to understand how well your body recovers overnight
-
Energy Score: Keep track of your activities' energy levels
-
Women's Health: Keep track of your cycle, hormonal shifts & fertility with personalized insights based on your vitals
-
Stress Monitoring: See how stress affects your body & get guidance on when to rest or push harder
-
Wake Up: Wake up in the best phase with your phone, with a smart alarm & get a personal wake-up score each morning
-
Vital Alerts: Get early warning notifications when your health metrics detect something unusual before you feel it
-
Coherence: Learn breathing techniques that sync your heart & brain for instant claim & better focus
-
Medication Reminder: Get timely alerts so you never miss important medications or supplements
-
Breathing Sessions: Learn personalized breathing techniques that work for your stress levels
-
Sport Sessions: Monitor your workouts with data & insights that help you train more effectively
-
Live Measurement: See your biometrics in real time & monitor your workouts with data and insights
Kira™ AI Health Coach
The ring captures over 8 key health signals, and the app turns those readings into clear, easy-to-understand insights. You see patterns in your recovery, energy, stress, and sleep without needing to decode anything.
And then, Kira, your AI health coach, watches for any changes in your vitals, spots early warning signs, and sends you gentle, helpful recommendations. No searching. No guessing. Kira already knows what matters and what to do next.
Wearing and sizing tips
Circular Ring 2 is available in 9 sizes, from US 6 to US 14 (no half sizes). The sizing follows standard US ring sizes, so if you already know yours, Circular matches it.
- You can wear Circular on any finger, but all four fingers (except from the thumb) give the most accurate readings.
- The thumb still works, but with less precision.
- Best worn on your non-dominant hand (e.g., to wear on the left hand if you’re right-handed).
- Finger size changes during the day! Sizing is most accurate midday.
- The Circular logo of the ring should face the top of your finger, and the flat sensor part should face your palm.
- Between sizes?
- Choose the larger size of both, but make sure it’s snug enough not to fall off.
- If you have large knuckles, choose the smallest size that slides over them comfortably.
Compare against other rings
- Circular Ring 2 size = Oura ring Gen 3 & 4 size
- Circular Ring 2 size = Samsung ring size
- Circular Ring 2 size = Ringconn 2 ring size + 1 (e.g. size 6 Circular = size 7 Ringconn)
- Circular Ring 2 size + 1 = Ultrahuman Air ring size (e.g. size 7 Circular = size 6 Ultrahuman)
What people say about Circular
Designed not to distract
4.9 ★ ★ ★ ★ ★ ★
"No screen, no buzzes, just a stylish ring that fits seamlessly into my daily life with no distractions."
Blood Pressure & Glucose is a dream
4.9 ★ ★ ★ ★ ★ ★
"I'm super happy about the features, looking forward to wearing this. I'm super excited for Blood pressure and Glucose. It's crazy that you can do that with such a small technology."
EKG is a nice addition!
4.9 ★ ★ ★ ★ ★ ★
"As a cardiology professional (hospital turned med tech), of 19 years, the EKG feature is the one I cannot wait for!! Exactly what I've been waiting for."
