Where it leads
The RingConn Gen 2 is the value pick of the smart-ring field. It costs roughly half what an Oura Ring 4 does over time, takes no subscription, and its battery is the standout number in this entire comparison — around twelve days per charge, with a case that extends that to months. It is light, titanium, properly waterproof, and even adds sleep-apnea screening. For HRV and sleep its accuracy sits solidly in the same conversation as the pricier rings.
Where it falls short
You feel the budget in the software and the data. The app is functional rather than polished, there is no open API, and your data largely stays inside the RingConn app. None of the individual metrics is class-leading — this is a device that is good at everything and best, in this field, only at battery life and price.
Who it is for
Choose the RingConn Gen 2 if you want most of what a premium ring does — overnight HRV, sleep, stress — for noticeably less money and with no recurring fee, and you care more about battery life than about polished software or open data. If you want the most accurate ring or the deepest app, the Oura Ring 4 still leads.