Vital Signals thinks its Signal Ring is accurate enough to replace traditional blood pressure cuffs for the almost half of US adults who live with high blood pressure. The new wearable is thicker than the average ring, not unlike Oura’s older smart rings, but its on-the-spot and continuous blood pressure monitoring laps competitors like Samsung, Apple, and Whoop—if you’re willing to pay $399 to use it.
The Signal Ring has a titanium exterior and a resin-lined interior, with sensors along the inside for measuring heart rate and blood pressure, and around five days of battery life with its charging case. Throughout the day, the Signal Ring measures blood pressure in the background, but when you want the most accurate reading, Vital Signals says its app can guide you through the process. The app offers breathing exercises and posture cues to make sure you get the best reading possible and tracks and contextualizes your measurements afterward. Importantly, the Signal Ring is also able to offer these insights without calibration or the need for a subscription.
- © Vital Signals
Samsung’s and Whoop’s wearables can take blood pressure measurements, but require calibration with a cuff first. Because your body changes over time, those features also need to be recalibrated to stay accurate. Apple, which added hypertension alerts to its wearables alongside the Apple Watch Series 11, doesn’t even bother trying to take on-demand readings, instead averaging a wearer’s blood pressure over time.
As recently as December 2025, the American Heart Association recommended against using cuffless blood pressure tools because they’re not accurate enough for diagnosis or treatment. Vital Signals hopes to challenge that with a sensor that “reads blood flow four to five times faster than the sensors in other cuffless trackers,” making it capable of capturing more detail of the “pulse wave” (the swelling and contracting of arteries that happens as your heart pumps blood). Those details are fed into the company’s custom algorithm to determine your blood pressure, but calculations are processed in the cloud rather than on-device, so you’ll need an internet connection, according to Bloomberg.
- © Vital Signals
Assuming it all works as described, avoiding calibration makes Vital Signals unique. And the company seems confident in its technology: Bloomberg writes that, separate from the consumer version of the Signal Ring, the company also plans to introduce a medical-grade version that can actually diagnose patients with hypertension. That’s something FDA-cleared wearable features aren’t legally able to claim. The consumer version will still be a wellness device, but if it can offer easier and more accurate blood pressure monitoring, it could be the device to copy for its competitors.
The Signal Ring is available to preorder now for $399 in U.S. ring sizes between five and 13. Anyone who orders a ring will receive a sizing kit to determine their fit before the ring starts shipping out to customers in October.
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