Measured continuously, then read back to you in plain language by Kira — with a single-lead ECG whenever you want one.
$279 $349 USD · HSA/FSA eligible
10+ Industry Awards
Seven sensors on the inside of a four-gram titanium band, reading your heart, your sleep, your movement and your recovery against your own baseline. Included with the ring, with a few optional Pro features you can unlock in the app.
A 40-second reading whenever you want one. A world first on a ring.1
Every one of the 14+ health tools is included with the ring, permanently.
Extras for people who want to go deeper. Never a paywall on your own vitals.
Your data read back to you in sentences instead of charts.
140+ biomarkers in six families. Tap any one for what it is, why it matters, and where it lives in the app.
The finger gives optical sensors their strongest signal, and it is somewhere you will actually keep a device — through sleep, showers, training and years. Data you don't collect can't tell you anything.
140+ biomarkers are only useful if someone understands them. Kira will tell you why last night scored 79, and the answer is about things you can change and improve.
Kira is included with the ring, and it learns your baselines from the first two weeks of wear onwards, for as long as you wear it.
Kira
Unmatched offering against price.
Forty seconds at your finger for a single-lead trace, screened for atrial fibrillation.
↗ Blood PressureA trend read from the pulse wave, calibrated against your own cuff.
↗ SueñoFour stages, a nightly score, and the timing your body actually wants.
↗ Activity & EnergySteps, calories and training zones, with an energy score you can plan around.
↗ Sports sessionsStart a session for precise tracking, or let the ring detect the effort itself.
↗ Vital alertsThresholds you set on heart rate and oxygen, logged the moment they are crossed.
↗ EstrésWhere the load fell today, and where it lifted again.
↗ Salud femeninaTemperature and cycle read together, night after night.
↗ LongevityA biological age after the first month, updated monthly rather than daily.
↗ Wake UpA wake-up score, and a window rather than a fixed alarm time.
↗ Medication reminderA nudge on the finger, one tap to confirm, and an exportable record.
↗ Guided Breathing & CoherencePaced breathing with coherence scored live as you follow it.
↗ Live MeasurementsStream heart rate, oxygen and HRV and watch them move in real time.
↗ Analíticas avanzadasOverlay any two metrics, and read the patterns the ring found on its own.
↗Your sleep and energy scores earn coins every day you wear the ring. Keep the run going and each day pays more than the last. The leaderboard resets at the start of every month, so a good month is worth having.
An 11-day streak is currently multiplying every daily payout.
Most devices charge for the hardware, then charge again every month to read your own data. We charge once.
Anillo Circular 2
$299
Everything included, permanently.
A subscription device
$564–714
Hardware, then a monthly fee to see your data.
We would rather you checked than trusted a banner. Type a question and put it to the model you already use.
Opens in a new tab, on their site, with their answer — not ours. Prefer ours? Read the science.
Every score on this page is measured against your own baseline, and a baseline takes about two weeks to build. Here is what that looks like.
Order the sizing kit first. Fit decides signal quality more than anything else you do.
Sizing guide ↗Eight days of battery means one charge a week, in the twenty minutes you shower.
Resting heart rate, HRV, temperature and how long you actually need. Scores firm up as it goes.
Deviations start to mean something, and Kira's recommendations become specific to you.
In the box: ring, charging dock, USB-C cable, quick start guide. iOS 15+ and Android 9+.
Waterproof to 50 m, and light enough to forget, because the best health data comes from a ring you never take off.
"The Circular Ring 2 is shaping up to be quite an innovation powerhouse in the smart ring segment. Armed with an ECG, PPG, and a temperature sensor, it can measure everything from heart rate and blood oxygen saturation levels to ECG activity and heart rate variation."
"Additional upgrades compared to its predecessor, including a better battery life; the company promises eight days. It also comes with enhanced sensors to track key health metrics."
Romain GrosjeanWatch on Instagram
Worn day and nightWatch on Instagram
Four grams of titaniumWatch on Instagram
Two weeks of testingWatch on Instagram
Day in the lifeWatch on Instagram
What ring is that?Watch on Instagram
The data every morningWatch on Instagram
The hardware in Ring 2 was built ahead of its software, so new capabilities arrive.
Trend-level blood pressure from the optical & ECG signal at your finger
Non-invasive glucose trend estimate
Your measurements sync to your account so the app can compare today against your own history. We do not sell personal health data. You can export everything, and delete your account and its data from the app. See the privacy policy.
The reading is designed to be shared with a clinician and is not a substitute for a diagnosis.
Up to eight days depending on how often you take ECG readings and run live measurements. A full charge takes about ninety minutes on the dock.
Yes. It is water resistant to 50 m for up to 30 minutes, which covers showers, pools and open water swimming. Not designed for diving.
iOS 15 and later, Android 9 and later.
Order the sizing kit first if you are unsure. If the ring still does not fit, returns are free for fourteen days. See warranty and returns.
Nothing you need to see your own health is behind one. All essential core health tools and Kira, are included with the ring. A few Pro features can be unlocked in the app if you want them — always optional, never required.
Yes, in the US the ring is generally eligible, which is a 30–40% effective saving. Details on the HSA/FSA page.
Delivery windows differ by region; for references, 5-8 days for the US, 5 days for Europe, and 3 days for Asia. Worldwide shipping, with a 1-year manufacturer warranty and 24/7 support.
$299 · 14-day returns · 1-year warranty · HSA/FSA eligible
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1 Circular is not a diagnostic device and does not replace medical advice. 2 Battery life varies with use. 3 Illustrative: eight hours of sleep tracking per night.
$299 · 14-day returns · 1-year warranty · HSA/FSA eligible
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