RingConn

Founded in 2021 in Shenzhen, RingConn (commercialized by Jiuzhi Technology) was built on years of biomedical-circuit research led by founder Dr. Guoxing Wang, a professor at Shanghai Jiao Tong University. Its smart rings track sleep, heart rate, activity, and stress with no mandatory subscription, and its Gen 2 ring — launched via a record-setting crowdfunding campaign — introduced integrated sleep-apnea monitoring with 10-12 day battery life. The company says it now reaches users in over 190 countries and holds a Chinese Class II medical-device certification for a smart ring.