smart-ring
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The company that turned a $6,000 diabetes gadget into a $249 ring
Piyush Gupta left Abbott, watched his wife struggle with gestational diabetes, and decided the fix wasn't a better sensor - it was a cheaper one. A decade later, Ambrosia Systems sells glucose tech in 100-plus countries and just put the whole thing on your finger.
Ultrahuman
Ultrahuman is a Bengaluru-founded health-technology company building a subscription-free wearable and diagnostics ecosystem centered on its Ring AIR and Ring PRO smart rings. Beyond the ring, the company sells a continuous glucose monitor (M1), a home environmental sensor (Ultrahuman Home) and a blood-biomarker service (Blood Vision), stitching them into a single app that turns sleep, movement, metabolic and recovery data into personalized nudges. Founded in 2019 by Mohit Kumar and Vatsal Singhal, it is now the second-largest smart-ring maker by units sold and is expanding US manufacturing to challenge market leader Oura.
ŌURA
ŌURA makes the Oura Ring, a titanium smart ring that reads sleep, recovery, heart rate, temperature and activity from the finger. Founded in Oulu, Finland in 2013 and now co-headquartered in San Francisco, it has shipped more than 5.5 million rings, surpassed $500M in 2024 revenue and reached an $11B valuation in its 2025 Series E.