Circular Ring 2 is a health-focused smart ring built around on-demand ECG and claimed AFib monitoring, with core features Circular says do not require a subscription. The article this title refers to was a brief CES 2025 hands-on preview, not a long-term review: it offered an early look at a demonstration, but did not verify everyday accuracy, comfort, software reliability or shipping performance.
As of August 18, 2026, Circular’s store lists the ring at $349 in the US and claims up to eight days of battery life in Power Mode or five days in Performance Mode. Those are manufacturer-listed specifications, not independent test results. If ECG is your main reason to consider it, treat the feature and its availability as something to verify for your region and app version before buying.
What the CES hands-on actually established
Wareable published its hands-on report on January 7, 2025, during CES. The author tried the ring at a Circular demonstration stand. The report described a redesigned, titanium-style ring, on-demand ECG, claimed AFib detection and a digital sizing demonstration. It was an initial encounter, not weeks of independent testing.
The demo suggested that Circular had a more distinctive product story than its earlier Ring Slim: a smart ring emphasizing heart-rhythm features alongside wellness tracking. It did not establish ECG accuracy across users, long-term comfort, stable software, real-world battery life or whether every announced feature would be available at launch. Wareable also reported an expected price of about $380 at the time; that historical expectation is not the current listed price.
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What Circular Ring 2 is
Circular describes Ring 2 as a screenless health and wellness ring for sleep, activity, recovery and biometric tracking. Its product page advertises more than 140 biometrics and 13-plus health features; those are company claims, not independent validation of measurement quality. The differentiating promise is an on-demand, single-lead ECG and related heart-rhythm monitoring.
ECG and AFib monitoring: what they mean
An ECG, also called an EKG, records electrical signals associated with heart rhythm. Most smart rings instead rely primarily on optical PPG sensors, which use light to estimate pulse and related metrics. Circular says Ring 2 has a single-lead ECG sensor and a 40-second heart-rhythm check; Wareable reported that Circular claimed AFib detection through a partnership with B-Heart.
AFib detection is an algorithmic interpretation of rhythm data that may identify patterns consistent with atrial fibrillation. It is not a diagnosis of every heart condition. A single-lead consumer ECG is not equivalent to a 12-lead clinical ECG, and a normal reading cannot rule out all problems. Do not treat marketing language such as “medical-grade” or “clinical-level” as proof of a particular regulatory clearance: the dossier did not independently verify a specific FDA clearance record for Ring 2.
A failed or irregular reading can have multiple explanations, including movement or poor contact. If a result concerns you, discuss it with a healthcare professional. Chest pain, fainting, severe shortness of breath or sustained palpitations warrant medical attention; do not use a wearable reading to delay care.
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How an ECG reading is intended to work
The CES demonstration involved touching an outer electrode with the opposite hand. The exact app flow may vary with software version, so treat this as a general description rather than a verified guide to every current interface.
- Open the Circular app and start an ECG or heart-rhythm measurement.
- Hold still and make the instructed skin contact with the ring electrode using the opposite hand.
- Wait for the recording to finish.
- Review the waveform or result in the app, and seek clinical advice if you have concerns.
Movement, poor electrode contact, cold or dry fingers, fit, finger swelling, sweat or water at the contact point, and taking a reading immediately after intense exercise can affect measurement quality. These are general considerations for contact-based readings, not proof that Circular’s implementation is defective.
Current listed specifications and price
The following figures are listed by Circular’s official store, checked for this article on August 18, 2026. They are manufacturer claims and may change.
| Specification | Circular listing |
|---|---|
| US price | $349 |
| Body | Titanium |
| Thickness and width | 2.55 mm thick; 7.8 mm wide |
| Weight | 3 g |
| Sizes | US 6–14 |
| Listed sensors | ECG, PPG, temperature and three-axis accelerometer |
| Battery claim | Up to 8 days in Power Mode; 5 days in Performance Mode |
| Charging claim | Wireless charging; about 30 minutes |
| Compatibility | iOS and Android |
| Water-use claim | Shower, pool and rain use |
| Sizing kit | Additional $5 |
“Up to” battery life depends on settings and use. Frequent ECGs, workouts, measurements or syncing may reduce endurance; the figures above are not independent battery-test results. Circular lists a one-year warranty and 14-day returns on its store page, but confirm current terms before purchase.
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- [No Subscription Fee for Standard Features] Unlock the lifetime use of essential standard features on the RingConn Smart Health Monitoring App with your RingConn Gen 2 Air Smart Ring. Experience continuous, real-time health tracking and personalized insights
- [Longer Battery Life] Enjoy up to 10 days of uninterrupted power with a single full charge that completes in just 90 minutes. Stay powered through your busy schedule without frequent recharging and efficiently maintaining continuous long-term data collection
Sizing and fit
At CES, Circular demonstrated app-based sizing: the user placed a hand beside a standard credit card, which served as a known-size reference for an AI-assisted estimate. Wareable reported that the demo recommended size 10. That demonstration does not establish that the method will fit every buyer. Circular’s current store also lists a physical sizing kit for an additional $5 and sizes US 6–14, without half sizes.
Fit matters for both comfort and sensor contact. A loose ring may shift; a tight one can become uncomfortable as fingers swell during sleep, exercise or heat. Ordinary jewelry sizing may not transfer directly to a smart ring. Use the manufacturer’s supported sizing process when uncertain, and consider fit at different times of day before relying on continuous wear.
Subscription model and announced features
Circular says core features—including ECG, sleep tracking, HRV, activity, stress, women’s-health tracking, SpO2, vital alerts and personalized wellness recommendations—are available without a recurring subscription. The company also describes a premium or Circular Coins model for some advanced features. “Subscription-free” therefore does not mean every current or future feature is necessarily free.
Circular has announced blood-pressure trend monitoring, glucose-trend monitoring, AI coaching through Kira and additional insights. Its pages have used differing rollout timing, so treat these as announced or planned features unless the company confirms they are available in your region and app version. A planned blood-pressure trend is not a substitute for a validated cuff measurement; a glucose trend is not a substitute for a continuous glucose monitor.
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How it compares with other options
| Option | Potential reason to choose it | Trade-off to consider |
|---|---|---|
| Circular Ring 2 | On-demand ECG and claimed AFib-focused monitoring; core features advertised without a recurring subscription; iOS and Android support. | Early CES impressions do not establish long-term performance; verify feature availability and software experience. |
| Oura Ring | Established sleep and recovery focus and a more mature software experience, according to comparative coverage. | It does not offer Circular’s on-demand ECG feature; membership costs and terms can vary. |
| RingConn | Subscription-free positioning, light design and long-battery-life claims; its Gen 2 also emphasizes sleep-apnea-related features. | Its central pitch differs from Circular’s ECG focus. |
| Samsung Galaxy Ring | May suit buyers invested in Samsung Health and the Galaxy device ecosystem. | Consider device and platform compatibility; Circular lists support for both iOS and Android. |
| ECG-enabled smartwatch | May offer a display, prompts, notifications, workout controls and a broader watch ecosystem. | Less discreet than a ring and may be less appealing for overnight wear. |
These are differences in positioning, not evidence that one device’s ECG is more accurate than another’s. Tom’s Guide judged Oura the better overall smart ring in its comparison while identifying Circular’s heart-health monitoring and battery claims as advantages. Individual needs and current product versions matter.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who should consider Circular Ring 2?
Consider it if ECG is central to your smart-ring search, you are comfortable taking deliberate readings, you want a discreet form factor, and you prefer avoiding a mandatory membership for core features. Check the current app, regional availability, sizing process and the exact feature set before ordering.
Consider an alternative if you prioritize the most polished sleep and recovery app, extensive workout tracking, a display or notifications, a medically validated device for an existing condition, or a fully established software and support experience. A smartwatch may be a better fit for interactive controls and wrist-based ECG; another ring may suit you better if thinness or simplicity matters more than ECG.
FAQ
Is Circular Ring 2 a long-term review?
No. The hands-on report covered here was a brief CES 2025 demonstration, published January 7, 2025. It did not establish long-term comfort, accuracy, reliability or software quality.
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- [AI-Powered Health Insights] RingConn Gen 2 Air Smart Ring integrates AI with multi-sensor data to continuously track key health metrics like sleep, heart rate, stress levels, blood oxygen, physical activity, and menstrual cycles. Its built-in AI assistant delivers your personalized report and guidance to enhance your wellness and daily habits
- [Size Before You Buy] RingConn Gen 2 Air uses unique sizing standards, different from standard ring sizes. Purchase RingConn Sizing Kit to find the most accurate and comfortable fit for your finger
- [No-Feel Wearing] Experience a comfortable, stylish design with a super-thin 2mm profile and only 2.5g weight. Won't interfere with your movement whether you're working out, running, diving, or engaging in any physical activity, and stays comfortable without distracting you when sleeping or working
- [No Subscription Fee for Standard Features] Unlock the lifetime use of essential standard features on the RingConn Smart Health Monitoring App with your RingConn Gen 2 Air Smart Ring. Experience continuous, real-time health tracking and personalized insights
- [Longer Battery Life] Enjoy up to 10 days of uninterrupted power with a single full charge that completes in just 90 minutes. Stay powered through your busy schedule without frequent recharging and efficiently maintaining continuous long-term data collection
Can Circular Ring 2 diagnose AFib or other heart conditions?
Do not treat a consumer ring reading as a diagnosis or as a substitute for medical care. Circular claims AFib-related monitoring, but the dossier did not independently verify a specific FDA clearance record for Ring 2. Discuss concerning results with a clinician.
Does Circular Ring 2 require a subscription?
Circular says its core features do not require a recurring subscription, while some advanced features may use premium access or Circular Coins. Check the current terms for the particular feature you want.
How long does the battery last?
Circular’s store lists up to eight days in Power Mode or five days in Performance Mode. Those are company claims; actual battery life can vary with settings and use.
How much does Circular Ring 2 cost?
Circular’s US store listed it at $349 when checked on August 18, 2026. The store also listed a physical sizing kit for an additional $5. Prices and policies can change, so verify them before purchase.
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Should I wait for a full review before buying?
If you need proven ECG performance, dependable software, or confident long-term fit and battery results, waiting for current independent testing is prudent. A short CES demo is useful for understanding the concept, but cannot answer those questions.
Quick Recap
Sources
- Wareable: Circular Ring 2 CES hands-on
- Circular Ring 2 official store page
- Circular Ring 2 official product overview and FAQ
- TechRadar: Circular Ring 2 review
- Tom’s Guide: Oura Ring 4 vs Circular Ring 2
- Tom’s Guide: RingConn Gen 2 hands-on
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
