A startup called Vital Signals says it has developed a $399 smart ring designed to measure blood pressure with accuracy comparable to a traditional arm cuff. The pitch is ambitious: replace a device that has been a standard part of medical care for roughly 150 years with a smaller, easier-to-wear alternative.

According to the company, the ring could make blood pressure tracking more convenient for people who want regular readings without using a bulky cuff. That kind of continuous or simpler monitoring has become a major goal in the wearable health market, where companies are trying to move beyond basic fitness features and into more medically useful tools.

Vital Signals is also pointing to a broader future for the device, saying it could eventually support medical diagnoses. That suggests the company sees the ring as more than a wellness gadget, though any expansion into diagnosis would likely bring greater scrutiny around accuracy, validation and regulation.

For now, the main focus is the company’s claim that a ring can match the performance of a standard blood pressure cuff. If Vital Signals can deliver on that promise, it could mark a notable shift in how consumers and clinicians think about everyday blood pressure monitoring.