I tried a $170 Oura Ring alternative with no subscription - here's my buying advice

ZDNET reviews the $170 Renpho Lynx smart ring as an affordable, no-subscription wellness tracker that reliably captures basic metrics (sleep stages, heart rate, HRV, SpO2, steps) with around seven days of battery life, but lacks advanced insights, a polished app experience, and broad exercise coverage (only 30 activities); setup and syncing are smooth and the hardware is solid, yet vague guidance and minimal analytics make it best for budget-minded users seeking simple sleep and step tracking, while pricier options like Oura Ring 4, Galaxy Ring, and RingConn Gen 2 offer more robust features.