This $399 Ring Reads Your Blood Pressure Without a Cuff
Vital Signals is shipping a $399 ring in October that claims real blood pressure readings with no cuff needed, ever.

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iDevice advice
NO NEED TO RUSH
$162.16 at Amazon is $12.17 above its lowest price in the 58 days iDevice has checked it. At about $157 or less, the answer turns to Buy now.
Ask about the Amazfit Helio Ring
Comparison
Compare smart ringsCost over 3 years
$149.99
Device price plus the three years of subscription this product requires.
Weight
4–4g
Grams on your finger. Lower is lighter.
Battery life
4 days
How long it lasts on its own, away from a charger.
Oura Membership costs $5.99 a month. The full features need it. The ring keeps working without it. You just see three numbers a day. Over 3 years that is $216.
Sleep stages, HRV, body temperature and the long-term trends. Without it the app shows your three daily scores and stops there.
DeviceRequired subscription
Ring weights change with size. These are the officially quoted size.
Battery life can vary based on usage, settings and firmware version.
If not this one
Reviewers prefer its sleep tracking.
It tracks your heart, your sleep and your daily activity without stopping.
Reviewers prefer its subscription terms.
Quick answers
All FAQsScores published by other outlets, normalized and averaged. iDevice did not test these products for this score.
THIS PRODUCTAmazfit Helio Ring
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Frequently asked questions
Vital Signals is shipping a $399 ring in October that claims real blood pressure readings with no cuff needed, ever.