Blood pressure monitoring has traditionally depended on cuff-based devices that capture a single reading at a given moment. However, these measurements can be influenced by external factors such as stress, timing, or the environment, like a doctor’s office, potentially failing to reflect an individual’s true average. Continuous tracking provides a more accurate overview, but most wearables still require periodic cuff calibration to maintain precision. This requirement has now been eliminated for one device.
The Happy Ring’s cuffless approach
Happy Health’s Happy Ring, originally designed for sleep tracking, has obtained FDA clearance for its blood pressure monitoring capability. The Austin, Texas-based company claims it is the first cuffless device capable of continuously measuring blood pressure without needing external calibration. Unlike conventional wearables, the ring uses a combination of photoplethysmography (PPG) and bioimpedance to track blood volume and tissue properties with each heartbeat, converting these signals into precise readings measured in millimeters of mercury (mmHg).
The technology assesses physiological conditions such as hydration levels, body temperature, and medication use. If readings fall outside clinically validated ranges, the device withholds the measurement to prevent unreliable data. This method removes the need for a cuff, both during initial setup and for ongoing accuracy checks.
How it compares to existing solutions
For instance, Biobeat offers a chest patch that provides continuous tracking but still requires calibration against a traditional cuff. The Happy Ring’s key advantage is its elimination of this dependency, though both aim to deliver 24-hour monitoring without disrupting daily activities.
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The ring’s accuracy was confirmed through comparisons with invasive arterial line measurements, the clinical benchmark for continuous blood pressure tracking. Testing included participants with diverse body mass indices, skin tones, and health conditions, factors known to impact measurement reliability. Happy Health reports a mean difference of less than 1 mmHg for both systolic and diastolic readings, matching the precision of cuff-based alternatives.
While other wearables emphasize activity or heart rate monitoring, the Happy Ring’s original purpose was sleep tracking. The addition of blood pressure measurement expands its applications, particularly for conditions like sleep apnea, which can trigger repeated cardiovascular stress during sleep. By linking blood pressure data with sleep patterns, medical professionals may detect risks that isolated measurements overlook.
A shift in how blood pressure is tracked
Happy Health secured $75 million in funding during August 2026 to expand its platform for home-based health tracking. The investment supports development of features that connect patient data with physician oversight, bridging the gap between at-home monitoring and clinical decision-making. Currently, the company prioritizes accessibility, offering the device through direct purchase or physician referrals within its network.
