The CIRCUL RING 2 MAX is a smart ring that tracks heart rate, HRV, blood oxygen, sleep and blood pressure around the clock, updating every second. Its self-adaptive fit is the standout: one ring is meant to sit on different fingers and stay comfortable as fingers swell and shrink, so no sizing kit is needed. It also stands apart for charging nothing extra to unlock features, unlike rings that gate insights behind a subscription. Battery life is rated at 7 days in truly continuous mode, and the ring stores up to 3 days of data on its own. Buyers call it comfortable even on arthritic fingers and like the sleep debt and bedtime reminders; the cuff-free blood pressure feature is labeled for research and innovation, not medical use.
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Lowest price we've seen: $175.00 on Nov 13 at Poshmark. Tracked across 1 store since Nov 13.
With 81 ratings averaging 4.8, owners mostly praise the adaptive fit, near-week battery life and the lack of a subscription. Comfort on arthritic fingers and the sleep debt reminders come up often.
The CIRCUL RING 2 MAX is a smart ring that tracks blood pressure, blood oxygen (SpO₂) and sleep. It collects data continuously, 24/7, with updates every second. The blood pressure feature is cuff-free and AI-powered, and it is for research and innovation purposes only.
The ring is made of non-allergenic 316L stainless steel with a PVD coating. Its adaptive-fit design adjusts to changes in finger size, so one ring fits multiple fingers and no sizing kit is needed.
Sleep features include sleep apnea risk assessment, sleep debt calculation, and bedtime and nap reminders. All features are unlocked with a one-time purchase and no subscription.
