Oura Ring 4 review: comfortable, better data collection, and gorgeous, clean app, but requires a paid subscription to use basic features and colors cost more (Daniel Cooper/Engadget)

Daniel Cooper / Engadget:
Oura Ring 4 review: comfortable, better data collection, and gorgeous, clean app, but requires a paid subscription to use basic features and colors cost more  —  It remains the smart ring to beat, but is still limited by its form.  —  Smart rings have been a niche inside a niche in the wearables world for more than a decade.