This free tool compares five smart rings side by side: the Oura Ring 5 and Ring 4 against the RingConn Gen 3, Gen 2, and Gen 2 Air. It covers specs, a feature by feature software matrix, validation posture, and an interactive multi year cost calculator that factors in subscriptions, using official manufacturer specs only. On cost, RingConn wins clearly because no RingConn model carries a subscription: Gen 3 stays $349, Gen 2 is $299, and Gen 2 Air is $199. Oura requires a $5.99 per month or $69.99 per year membership for almost every insight beyond the three daily scores, so an Oura Ring 5 works out to roughly $603 over three years and about $743 over five. The fair counterweight is that the recurring fee funds a faster software cadence and a much larger feature set, and that Oura points to multiple peer reviewed validation studies while RingConn's accuracy numbers are largely internal. No signup required.
It is built by Kygo Health. Kygo Health is an iOS and Android app that connects AI food logging to wearable data and shows how what you eat affects your sleep, HRV, resting heart rate, energy, and recovery. It syncs Oura Ring, Apple Health, Health Connect, Fitbit, Garmin, and WHOOP. Food logging, wearable syncing, and nutrition tracking are free. Premium, which unlocks the correlation engine, costs $9.99 per month or $39.99 per year with a 7 day free trial on the yearly plan. Kygo is a general wellness product, not a medical device.