Live Healthier, Longer with World’s First ECG & AFib Detection Smart Ring

Your heart rate is the cornerstone of health tracking.

Circular measures it continuously to show how your body reacts to activity, rest, and even emotions. Because the ring sits on your finger, it’s one of the best spots for accurate readings. From this one signal, Circular also calculates other metrics, like calorie burn and recovery. Think of it as the foundation stone — without it, the rest of the house wouldn’t stand.

Kira works more like a thoughtful guide than a gadget.

She takes your vitals — sleep, stress, heart, recovery — and explains them in plain language. Instead of leaving you with numbers, she points out what they mean for your day and suggests simple steps you can actually follow. With Kira+, the advice gets even more personal, showing you how your habits and health connect over time.

Blood Pressure (Free Version)

Blood pressure shows how hard your heart is working to push blood through your body. When it’s balanced, you feel steady and well. When it’s too high or too low, it can quietly strain your heart, brain, and kidneys. Circular gives you a simple daily score with clear color codes, so you know right away if things look normal or if it’s time to pay attention.

Blood Pressure (Premium)

With the premium view, you get the full picture. Actual values, detailed graphs, and long-term trends show how your blood pressure shifts throughout the day and week. Kira then explains how those changes connect to your sleep, stress, or activity. It’s a clear, ongoing story of your heart health, told in a way that helps you take smarter action before small issues become bigger ones.

Activity Intensities & Calories Burned

Not all movement is created equal. Circular breaks your activity into low, medium, and high intensities, so you see the real picture of how active you’ve been. It also calculates calories burned, recovery time, and training zones. This isn’t just about numbers — it’s about understanding whether your daily activity actually matches what your body needs. A gentle bike ride, a high-intensity run, or even chasing your kids around the park all get counted in context.

Sleep isn’t just “on” or “off.”

You cycle through stages — light, deep, and REM — each with a unique job, from repairing tissues to consolidating memories. Circular tracks these stages automatically and pieces together your personal sleep profile: your cycle lengths, how long it takes you to fall asleep, and how your daily habits influence recovery. The goal isn’t just to tell you how long you slept, but to recommend the best sleep schedule for you, so you wake up feeling genuinely refreshed.

Your cycle isn’t just about dates on a calendar —

it’s reflected in your vitals too. Circular picks up on temperature shifts, sleep patterns, and personal context like habits and emotions, then translates that into predictions for your period and fertile window. Instead of guessing, you get a clear, science-based snapshot of what’s happening in your body. It’s a way to better understand your rhythm and plan life around it, not against it.

Catch Health Issues Before They Catch You

Think of this as your body's early warning system that catches problems before you even notice them. Circular monitors your heart rate, temperature, blood oxygen, and other key metrics 24/7, sending you gentle alerts when something looks off. Instead of waiting until you feel sick or exhausted, you get a heads up when your body needs attention.

We all know stress can hijack your day.

Circular doesn’t just measure how stressed you are right now. Instead, it looks at patterns and even predicts when your stress levels might spike in the next few hours. Pair that with personal notes, and you start seeing what triggers your stress. That means you can plan ahead, adjust, and keep your balance instead of being blindsided. It’s not magic, but it feels close when your ring tells you to take a breather before the meeting even begins.

Start Every Day at Your Peak

Your wake up score tells you how refreshed and ready you actually are, not just how long you slept. Circular tracks your sleep cycles and recovery to give you a simple number that shows whether you're firing on all cylinders or running on fumes. Circular Ring 2 has smart alarm that triggers phone's sound at the best moment to wake you up. It's like having a personal sleep coach that helps you time your bedtime and wake up calls for maximum energy.

Never Miss Another Pill

Never miss another medication with smart reminders that actually understand your routine. Circular learns your schedule and sends gentle notifications at the right times, whether it's daily vitamins or prescription medications. It's like having a thoughtful assistant who knows exactly when you need that reminder without being annoying about it.

Find Your Calm in 3 Minutes

This is about getting your heart and brain to work together harmoniously instead of fighting each other. Circular measures your heart rhythm patterns and translates them into a coherence score. Practice some simple breathing exercises and you can learn to enter a calmer, more focused state on demand.

De-Stress Anywhere, Anytime

Guided breathing sessions that help you find calm in the chaos of daily life. Circular walks you through simple breathing exercises designed to reduce stress, improve focus, or help you wind down for sleep. These aren't just generic meditation apps - the sessions adapt based on your current stress levels and what your body actually needs.

Train Smarter, Not Harder

This is like having a personal sports lab on your finger. Circular tracks over 30 different activities with real-time data like heart rate and pace, then gives you a detailed report afterward. Add GPS and your routes become part of your fitness story, helping you train smarter whether you're chasing records or just trying to stay consistent.

Check your data on the spot.

Sometimes you don’t want to wait for a summary. You want to know what’s happening in your body in this exact moment.
With on-demand spot checks, Circular Ring 2 instantly measures your heart rate, blood oxygen (SpO₂), heart rate variability, activity intensity, and max heart rate.  Powered by advanced optical sensors, it captures precise physiological signals and translates them into clear, readable metrics, no decoding required.

Mid-workout? feeling off? Or just curious, you can open the app and see live data in seconds.