Vital Signals has introduced a $399 smart ring that pushes beyond what Apple and Oura currently offer. The Signal Ring supplies numerical blood pressure values without any need for an arm cuff during setup or later use.

Preorders begin July 16 according to Bloomberg, with shipments expected in October. The ring gathers readings throughout the day and at night, then presents them in an iOS or Android app.

The consumer version lacks FDA clearance. Vital Signals is also developing a medical-grade model meant to identify hypertension and spot concerning patterns, although clinical trial outcomes remain unpublished.

How the Signal Ring operates

Specialized hardware and custom algorithms derive blood pressure estimates from the finger. The company states that its approach adjusts for factors such as body mass and shifts in arterial stiffness.

The American Heart Association notes that cuffless methods generally rely on optical sensors to gather cardiovascular signals, which software then converts into estimated values.

Users still need to remain still and trigger each session manually for the most reliable results. The companion app includes breathing guidance and halts measurements when motion or speech is detected, since these actions can distort readings.

Reasons for continued caution

Bloomberg observed several inaccurate readings during a hands-on test. Vital Signals attributed the errors to ring fit, an important constraint for any device that requires steady skin contact.

Most data processing occurs in the cloud. The ring stores measurements offline, but results stay hidden until reconnection happens.

The FDA cautions against depending on unapproved blood pressure wearables. An erroneous reading might postpone needed care or lead to an unwise medication adjustment. Draft guidance for cuffless devices outlines the rigorous testing required in this space.

Intended audience for the ring

Vital Signals aims at users managing hypertension or facing higher risk, not general fitness enthusiasts. The ring tracks heart rate and provides limited sleep insights, yet these functions remain secondary.

No subscription fee applies, which softens the $399 cost relative to Oura. Anyone whose care relies on precise numbers should continue with an approved arm cuff and seek professional advice. Real-world performance after the October launch will show how the device handles movement and imperfect fits beyond lab conditions.