Stress · Circular Ring 2
Circular Ring 2 tracks stress by reading HRV, heart rate, sleep, and recovery together, helping you see when your body is under strain and what it may need today.
3.1/ 5
Hourly trend · last two bars: 2-hour forecast
Take three minutes to breathe before your 2pm call.
Your heart rate is up and HRV is down since 11am.
Most trackers tell you your stress is high and stop there. They do not tell you what pushed it up, how long it has been building, or what would bring it down today. Circular Ring 2 was built to answer that.
You see a stress reading climb on a graph, but the tracker does not explain what is driving it or what to do next.
Stress connects to sleep, HRV, energy, and recovery. Most stress monitors look at one signal at a time and miss the pattern.
Breathing sessions, coherence training, and personalized recovery prompts are often held behind a monthly fee.
Stress can affect your body before you fully feel it. Circular Ring 2 reads HRV, heart rate, sleep, and recovery together to show when your body is under strain. Circular's personalized health coach Kira AI then turns that pattern into one clear step for today, like a short breathing session or an earlier bedtime.
Kira AI reads your stress alongside your sleep, HRV, and recovery, then writes one specific thing to do today.
HRV, heart rate, recovery, and sleep read together. Stress is interpreted alongside everything else your body is doing.
When stress climbs, the app offers a guided breathing session or a coherence practice. The tools sit inside the same ring, not behind a paywall.
The system reads your stress against your own normal, not a population average. What is normal for you sets the bar.
See your stress trends by day, week, and month, plus a 2-hour forecast to spot stress before it builds.
The stress tracker, the breathing tools, and Kira AI's actionable insights are all included with your ring's 14+ core feature plan.
You wake up feeling fine. By 11am, your heart rate is higher, your HRV is lower, and your stress score has climbed. Circular shows the shift, and a short breathing session helps you reset before the afternoon.
You slept badly and blame the room, dinner, or noise. But your stress was high all day yesterday and never fully came down before bed. Circular helps you see that poor sleep can be the result of stress, not the cause.
You feel normal, but your stress score keeps rising across several days. The trend makes the pattern clear. You take the next day slower before your body forces you to stop.
Your weekly meeting raises your stress every time. After seeing the pattern, you prepare differently with a short coherence session before the call and a peaceful break after.
A hard work stretch ends, but your stress score is still high. Circular shows that your nervous system has not fully settled yet, so you give your body more time to recover.
Your stress reading climbs faster than usual. The app suggests a three minute breathing session. You try it, your heart rate comes down, and you cope with stress better.
You change one habit, like bedtime, screen time, or evening alcohol. A month later, your average stress is lower. The change was small, but the trend is clear in the data.
Tag what happened
Kira AI
Kira AI reads your stress alongside every signal Circular Ring 2 captures, your sleep stages from last night, your HRV trend, your activity load, your temperature, your recovery, and the notes you tagged about a hard call or a missed meal. The picture is built from your data. The recommendation is written for your day. A breathing session before your next meeting. An earlier bedtime tonight. A slower morning tomorrow. Plain language, your baseline, no dashboard to decode.
Circular tracks stress by reading multiple physiological signals together, including heart rate variability, heart rate, skin temperature, sleep, and recovery patterns. The combination of signals is more reliable than any single number on its own.
Circular Ring 2 shows your stress on a scale from 1 to 5. Below 2.5 is normal. From 2.5 to 3.5 means your body is stimulated. Above 3.5 means your body is under stress. Daily, weekly, and monthly trends help you see how stress builds over time.
Stress is interpreted against your own 14-day rolling baseline. A reading that would be high for one person is not necessarily high for another, which is why a personal baseline is more useful than a population average.
You can tag stress events as they happen, such as a difficult conversation, a long flight, a poor meal, or a missed night of sleep. Kira AI uses your tags to sharpen pattern recognition over time.
When stress climbs, the app surfaces guided breathing sessions and coherence training as recovery prompts. Both tools are part of the ring's core 14+ features and require no subscription.
Circular Ring tracks physiological stress signals. It does not diagnose anxiety, depression, or any other condition. It is not a substitute for mental health care. For clinical concerns, talk to a doctor or a qualified mental health professional. The ring is not a medical device.
Stress data is encrypted and processed with GDPR and HIPAA compliance.
Titanium body, hypoallergenic interior
2.55mm thick, 7.8mm wide, 3 grams
Sizes: US 6–14
Battery: 8 days (Power Mode), 5 days (Performance)
Charging: 30 mins via wireless charger
ECG, PPG, temp sensor, 3x accelerometer
Bluetooth Low Energy, Airplane Mode
iOS & Android compatible
GDPR & HIPAA compliant
Every day, one clear thing to do, built on what your body is telling you.
USD$299
"I thought I was fine, but my stress score kept rising across the week. Seeing the pattern made me take Friday slower, and honestly, I needed that."
"The app gave me a breathing session right when my stress was high (exam day!). Simple, but useful. I did it for three minutes and felt less wired after."
"I like that stress is connected to sleep, recovery, and energy. It explains why one hard day can still show up the next morning."
Stress is rarely just stress. It connects to your other vitals like HRV, body temperature, ECG, and many other signals. Circular Ring 2 reads all of it as one system. The smart ring brings together 14+ core subscription-free health features, from ECG and AFib detection to cycle tracking, breathing tools, and coherence training. The more the ring understands, the sharper your stress patterns become, and the more useful Kira AI's daily recommendation gets.
Overnight heart rate variability read against your own baseline, so you can see recovery move.
Light, deep and REM sleep mapped across the night, with the timing and quality of each stage.
Tracks your body clock using sleep, temperature, HRV, and heart rate, then gives one step to reset your rhythm.
Your complex data, turned into clear tips tailored to your lifestyle.
Shows temperature changes from baseline. Variations beyond ±0.8°C (±1.4°F) may indicate significant health or environmental changes.
Tracks breathing rate. Deviations from baseline may signal important health changes. Normal resting range: 12–18/min.
Circular Ring 2 is not intended to diagnose, treat, cure or prevent any disease, and is not for use in an emergency.
Circular reads multiple physiological signals together, including HRV, heart rate, skin temperature, sleep, and recovery patterns. The combination is more reliable than any single number on its own, and the score is interpreted against your personal reference.
HRV is the most influential signal, alongside heart rate, sleep quality, and recovery. Activity and temperature also feed into the broader picture Kira AI uses when interpreting your day.
Yes. HRV is one of the main inputs because it reflects changes in your autonomic nervous system. We compare it with your baseline instead of judging everyone by one fixed number.
Yes. Heart rate is read alongside HRV. A rising heart rate combined with a falling HRV is one of the clearest stress patterns the ring detects.
Yes, as context. Poor sleep, sleep debt, and low recovery can help explain a higher stress load, but your stress score is not based on sleep alone.
Stress is measured continuously by the ring. The app displays one value per hour, giving you a clear hourly trend across the day and night without overwhelming you with raw data.
Yes. Your stress is interpreted against your own 14-day rolling baseline, not a population average. What counts as high stress for you may not be high for someone else.
Yes. Circular Ring 2 includes a 2 hour stress forecast, a feature unique to Circular. It looks at your own trends and patterns, including how your body usually behaves on similar days and at similar times. So instead of only seeing stress after it happens, you can see what may be building and adjust earlier.
No. Kira AI does not diagnose conditions, prescribe treatment, or replace medical professionals. It translates biometric signals into lifestyle and behavioral guidance you can act on. For anything clinical, the Circular app generates PDF reports and trend summaries designed to be shared with your doctor.
Yes. We encrypt data between your ring, the app, and our cloud systems. We do not sell your health data or use it for advertising, though we process and share limited data when needed to run, protect, and improve the service.
Take a reading whenever you want one. No subscription, no limit.
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