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This free tool compares 38 sleep metrics tracked by the Oura Ring, Fitbit, Apple Watch, and Garmin across 10 categories, so you can see exactly what each device measures. 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.