Happy Health’s Smart Ring Achieves FDA Clearance for Cuffless, Continuous Blood Pressure Monitoring

Traditional blood pressure measurements, which rely on an arm cuff, provide only a fleeting snapshot of a patient’s health at a single moment in time. These isolated readings can fail to reflect a person’s true average blood pressure, often inflated by the stress of a clinical setting. While continuous monitoring offers a more comprehensive view, most wearable devices on the market still require periodic calibration using a traditional cuff. That paradigm is now shifting.

Happy Health, an Austin, Texas-based digital health company, has introduced the Happy Ring, a smart ring designed to measure blood pressure continuously without the need for an inflatable cuff or external calibration. The company recently announced that its ring’s blood pressure monitoring capabilities have received FDA clearance. The device is now available for direct consumer purchase or through referrals from a physician within Happy Health’s network. Claiming to be the first blood pressure measurement device that requires no external calibration, this feature is integrated into the Happy Ring, which primarily functions as a sleep-tracking wearable.

To support its mission of expanding home-based healthcare, Happy Health secured $75 million in funding in August 2026 from ARCH Venture Partners and OpenLoop. The company’s devices are designed to assess sleep quality and other vital health metrics, delivering actionable data to both patients and healthcare providers to support clinical decision-making.

“This is blood pressure’s CGM moment,” said Dustin Freckleton, MD, founder and CEO of Happy Health, drawing a parallel to continuous glucose monitoring (CGM) devices used by individuals with diabetes. “High blood pressure is the most prevalent and modifiable risk factor for heart disease, stroke, dementia, and all-cause mortality. Seeing it in real life is incredibly powerful. Just as CGMs freed glucose monitoring from the finger stick, we have freed blood pressure from the cuff, transforming an occasional measurement into a passive signal that can reveal risk throughout everyday life, including overnight.”

The Happy Ring leverages two core technologies to deliver cuffless, continuous blood pressure monitoring: photoplethysmography (PPG) and bioimpedance. PPG is an optical sensing technique that uses light to track changes in blood volume with each heartbeat. Bioimpedance, on the other hand, utilizes a mild electrical signal to assess the properties of surrounding tissue, helping to determine blood volume and flow.

Freckleton explained that the device uses physics-based models of blood vessel expansion and contraction to translate these optical and electrical signals into absolute blood pressure readings in mmHg. “Because factors like hydration, temperature, medication, and vascular tone can influence these signals, the system continuously evaluates the physiological state during each measurement. If conditions fall outside our validated ranges, the ring can withhold the measurement rather than report potentially unreliable data. This capability is what allows the Happy Ring to measure blood pressure without an inflatable cuff and, crucially, without requiring a calibration cuff reading,” Freckleton added.

Happy Health is not the only player in the cuffless blood pressure space. Biobeat, for instance, offers a chest patch that provides 24-hour, cuffless, ambulatory blood pressure monitoring integrated with a mobile app and automated physician reports. However, unlike the Happy Ring, Biobeat’s system requires calibration against a traditional cuff measurement.

To validate its technology, Happy Health tested the ring against invasive arterial line measurements, which represent the clinical gold standard for continuous blood pressure monitoring. The device was also evaluated across a diverse population of individuals with varying BMIs, skin tones, and health conditions, as these factors can influence reading accuracy. The company reports that the mean difference between the ring and the arterial line standard was less than 1 mmHg for both systolic and diastolic blood pressure.

Freckleton discussed the profound clinical implications of continuous blood pressure monitoring, particularly during overnight hours.

“Sleep apnea is a prime example of what this additional context can reveal. It repeatedly stresses the cardiovascular system overnight and contributes to hypertension. When a physician can view blood pressure trends alongside a patient’s sleep and breathing patterns, they can begin to understand these complex relationships rather than looking at each measurement in isolation,” he explained.

For Happy Health, the long-term challenge lies in establishing how continuous blood pressure data should directly inform clinical diagnosis and treatment protocols. Translating these continuous patterns into actionable medical decisions will require further clinical evidence. Nonetheless, Freckleton remains optimistic that the device will facilitate the seamless integration of at-home blood pressure monitoring into patients’ daily routines.

“Our vision is straightforward: put on the ring when you go to bed, take it off when you wake up, and automatically receive the health measurements that matter to you and your doctor without having to remember to do anything,” Freckleton said. “Instead of asking patients to become better at monitoring their blood pressure, we can make the monitoring fit naturally into their lives.”

Photo: Waldemarus, Getty Images

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