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Circular Ring 3 Series

The most advanced smart ring in the world.

Ring 3 Pro is the world's first smart ring to bring advanced health monitoring, contactless payments and haptic alerts together in one wearable. Ring 3 Slim carries the payments and the everyday tracking, in the smallest body we have ever made.

The waitlist hears the price first and gets first access.

Interested in Ring 3 Pro Ring 3 Slim Not sure yet

Pre-orders open December 2026. More news to come.

You're on the list.

We'll email you when pre-orders open in December 2026, with pricing.

Circular Ring 3 Slim in silver, rose gold, anthracite black and gold — SilverRose goldAnthraciteGold

Circular Ring 3 Pro in gold, worn at a candlelit dinner

Two worlds, one ring

As useful monitoring your heart as it is buying a coffee.

The series

Two rings. One decision.

Until now you had to choose between a ring built for health tracking and one built for everyday purchases. Ring 3 Pro is the complete experience. Ring 3 Slim is the everyday one, in the smallest body we have ever made.

Flagship

Circular Ring 3 Pro

Choose Pro if you want the cardiac features and the haptics on top, and the longest battery.

Everything in Ring 3 Slim, plus the features Slim does not carry — and two more days on a charge:

ECG readings
Arrhythmia and AFib screening
Blood pressure tracking
Haptic alerts — silent wake-up, breathing, medication, vitals
Better battery — up to 12 days

6.8 mmWidth

2.78 mmThickness

12 daysBattery

Ultra-compact

Circular Ring 3 Slim

Choose Slim if you want the smallest ring that still pays and still tracks.

The same design language and the same tap-to-pay, focused on the health features people use every day — in a thinner body than almost every smart ring on the market.

NFC contactless payments
Sleep, Activity, Stress and more tracking
Glucose insights*
Up to 10 days of battery life

5.9 mmWidth

2.35 mmThickness

10 daysBattery

Already wearing a Ring 2? Your account, your history and the Circular app carry straight over — and Ring 2 keeps receiving the new software features, so nothing you own stops improving.

*Glucose insights are non-invasive wellness metrics and are not intended for the diagnosis, monitoring or management of diabetes. Health features should not replace advice from a qualified healthcare professional.

“The next generation of wearables should do more than simply collect health data. Whether you're tracking your heart rhythm, improving your sleep, remembering to take your medication or paying for your morning coffee, the Circular Ring 3 Pro becomes something you rely on throughout the day.”

Amaury Kosman · Founder & CEO, Circular

The most advanced smart ring in the world Thinner than almost every smart ring on the market The best value for the quality, all around The most advanced smart ring in the world Thinner than almost every smart ring on the market The best value for the quality, all around

Haptics · Ring 3 Pro

A ring that can tap you back.

Ring 3 Pro vibrates. Almost no smart ring on the market does, and it changes what a ring is able to do on its own — wake you, pace your breathing, remind you and warn you, with no phone in the room and no screen to look at. Haptics are a Ring 3 Pro feature; Ring 3 Slim does not vibrate.

Silent wake-up

Wakes you with a vibration at a light point in your sleep, without waking anyone beside you.

Guided breathing

Paces your inhale and exhale through vibration alone. Eyes closed, nothing to watch.

Medication reminders

A discreet tap at the times you set, wherever your phone happens to be.

Vital alerts

A vibration when your heart rate or rhythm moves outside your normal range.

In the app

Everything the ring measures, explained.

140+ biomarkers in seven families, all in one app on iOS and Android. Tap any one for what it is, why it matters, and where it lives in the app.

Finishes

Four finishes. Both models.

Gold, Silver, Rose Gold and Anthracite Black, in US sizes 6 to 14. Model and finish are chosen separately — pick the ring, then pick the colour.

Ring 3 Pro · Gold

6.8 mmWidth

2.78 mmThickness

12 daysBattery

YesECG

YesTap to pay

YesVibrate

Circular Ring 3 Slim in Anthracite Black

Circular Ring 3 Pro in Rose Gold, worn hailing a taxi in the city

Circular Ring 3 Pro in Gold, worn at a market stall

Circular Ring 3 Slim in Gold, worn on a tennis court

Circular Ring 3 Slim in Silver, worn on the water

The size story

A thinner body than almost every smart ring on the market.

The smallest rings Circular has ever developed — and they carry more, not less. Measured against Ring 2, across the widest point of the band.

Ring 3 Slim5.9 mm

Ring 3 Pro6.8 mm

Ring 28.0 mm

0 mm4 mm8 mm

2.35 mmRing 3 Slim thickness, against 2.8 mm on Ring 2.

US 6–14Both models, in Gold, Silver, Rose Gold and Anthracite Black.

Size comparison of Circular Ring 2, Ring 3 Pro and Ring 3 Slim

A gold Circular Ring 3 tapping a contactless payment terminal beside an iced coffee — Tap to pay

Payments

Tap to pay. No phone, no wallet.

Secure NFC contactless payments with supported Visa and Mastercard cards, on both Ring 3 Pro and Ring 3 Slim. The same gesture that unlocks a door pays for the coffee.

PaymentNFC payments ship on Ring 3 Pro and Ring 3 Slim alike.

Circular Ring 3 in Rose Gold, worn on the shutter hand of a camera — Health insights

Health

Heart rhythm, blood pressure trends, glucose insights.

Ring 3 Pro adds ECG readings cleared by the FDA, arrhythmia and AFib screening and blood pressure tracking on top of everything Ring 3 Slim measures. Kira — the AI health companion built into the Circular app — reads what the ring collects and tells you in plain language what changed and what to do about it.

Comparison

Ring 2, Ring 3 Pro, Ring 3 Slim.

Specification

Ring 2

Ring 3 Pro

Ring 3 Slim

Width

8.0 mm

6.8 mm

5.9 mm

Thickness

2.8 mm

2.78 mm

2.35 mm

Battery life

Up to 8 days

Up to 12 days

Up to 10 days

NFC contactless payments

—

Yes

Haptic vibration alerts

—

Yes

—

Sleep, HR, HRV, SpO₂, temperature

Yes

Daily activity

Yes

Kira AI health companion

Yes

Glucose insights*

Yes

ECG readings

—

Yes

—

Arrhythmia and AFib screening

Yes

—

Blood pressure tracking

Yes

—

Material

Titanium steel

Water resistance

50 m

Charging

Wireless

Sizes

US 6–14

Finishes

Four

*Glucose insights are non-invasive wellness metrics and are not intended for the diagnosis, monitoring or management of diabetes.

The road to launch

What happens next.

Now

The waitlist

Open. Everyone on it hears the price first and gets first access when pre-orders go live.

Then

December 2026

Pre-orders open, with pricing announced at the same time. More news to come.

After that

First deliveries

Ring 3 Pro and Ring 3 Slim begin shipping. Dates to be confirmed.

Upgrading

Already own a Circular Ring 2?

A special upgrade price goes out to Circular Ring 2 owners when pre-orders open, available for the first three months.

One

You'll be contacted

The upgrade price is sent to Circular Ring 2 owners. Nothing to apply for in advance.

Two

Three months to use it

The offer stays open for the first three months after pre-orders go live.

Three

Have your serial number

You'll be asked for your Circular Ring 2 serial number to claim it.

Up to 30% off

You don't have to wait for December.

Circular Ring 2 is up to 30% off in the run-up to the Ring 3 launch, and it is not being left behind: the new software features arrive on Ring 2 as well. The app, Kira and the insights are the same ring to ring.

Shop Circular Ring 2

Up to 30% off

On Circular Ring 2, until the Ring 3 Series launches.

The same software

New app features ship to Ring 2 too, not only to Ring 3.

On your hand this week

Ring 2 is in stock and shipping now.

Questions

Circular Ring 3, answered.

Where can I buy Circular Ring 3?

Circular Ring 3 pre-orders open in December 2026 on circular.xyz. Everyone on the waitlist is emailed when they go live, and delivery dates are confirmed closer to the time. More news to come.

How much will Circular Ring 3 cost?

Circular Ring 3 pricing has not been announced. It will be published alongside pre-orders in December 2026, and the waitlist hears first.

What is the difference between Circular Ring 3 Pro and Circular Ring 3 Slim?

Circular Ring 3 Pro is everything Circular Ring 3 Slim does, plus ECG readings cleared by the FDA, arrhythmia and AFib screening, blood pressure tracking and haptic vibration alerts — and a better battery, up to 12 days against 10. Both make NFC contactless payments, and both track sleep, activity, stress, heart rate, HRV, SpO₂, skin temperature and glucose insights. Circular Ring 3 Slim does not vibrate, and it is the thinner of the two, 5.9 mm against 6.8 mm.

What can Circular Ring 3 track in the app?

More than 140 biomarkers across heart, sleep, recovery, movement, mind and women's health — sleep stages and sleep debt, recovery and energy, heart rate and HRV, stress and coherence, activity and workouts, SpO₂ and skin temperature, glucose insights, cycle tracking, medication reminders, and Kira's plain-language read on all of it. Circular Ring 3 Pro adds ECG readings, arrhythmia and AFib screening, blood pressure trends and haptic alerts. Circular Pay lives in the same app.

Does Circular Ring 3 vibrate?

Circular Ring 3 Pro does. It has haptic vibration alerts: a silent wake-up at a light point in your sleep, guided breathing paced by the ring, medication reminders, and a warning when your heart rate or rhythm leaves your normal range. Circular Ring 3 Slim does not vibrate — it carries the NFC payments and the everyday tracking in a thinner body.

Which cards work with Circular Ring 3 tap to pay?

Supported Visa and Mastercard cards, on both Circular Ring 3 Pro and Circular Ring 3 Slim.

Can I upgrade from Circular Ring 2 to Circular Ring 3?

Yes. A special upgrade price goes out to Circular Ring 2 owners when pre-orders open, available for the first three months. You'll be asked for your Circular Ring 2 serial number to claim it.

Should I wait for Circular Ring 3, or buy Circular Ring 2 now?

Circular Ring 2 is up to 30% off until the Ring 3 Series launches, it ships now, and it keeps receiving the new software features — the app, Kira and the insights are the same on both. If you want tap to pay or the thinner body, those are Circular Ring 3.

Is there a subscription with Circular Ring 3?

The Circular app and its insights are included with the ring. Subscription details for the Circular Ring 3 Series are confirmed alongside pricing.

Does Circular Ring 3 work with Android?

Yes. The Circular app is on iOS and Android, and it is the same app for Circular Ring 2 and the Circular Ring 3 Series.

What happens to my health data with Circular Ring 3?

Your health data belongs to you. It is stored encrypted, it is never sold, and you can export or delete it from the app at any time.

What sizes and finishes does Circular Ring 3 come in?

US sizes 6 to 14, in Gold, Silver, Rose Gold and Anthracite Black, on both Circular Ring 3 Pro and Circular Ring 3 Slim. Both are titanium steel with 50 m water resistance and wireless charging.

The waitlist

Be first when pre-orders open.

One email in December 2026, when pre-orders and pricing go live. Nothing else.

Availability and pricing for Circular Ring 3 Pro and Circular Ring 3 Slim are announced in the coming months.

You're on the list.

We'll email you when pre-orders open in December 2026, with pricing.