The best smart rings for tracking sleep and health

Here is a 183-word summary of the news article on the best smart rings for tracking sleep and health: The article discusses the current state of the smart ring market, which is a niche and emerging gadget category. While there are many experimental and new brands, the Oura Ring 4 is considered the best smart ring for most people in 2023. The Oura Ring 4 has a new all-titanium design, improved battery life, and better accuracy thanks to a new sensor algorithm. However, it does require a $5.99 monthly subscription to access all features. The article also highlights a few other smart ring options as honorable mentions. The $400 Samsung Galaxy Ring offers excellent hardware and long battery life, but is Android-only and better suited for use with other Samsung products. The $350 Ultrahuman Ring Air provides a more fitness-focused experience without a subscription, using a "PowerPlugs" model for add-on features. Finally, the $199 RingConn Gen 2 Air is a more affordable and slimmer option, with great battery life of around 8-9 days. Overall, the article provides a concise overview of the top smart ring options currently available, with a focus on the leading Oura Ring 4.