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This free tool compares seven wearables against sleep-lab polysomnography, the clinical gold standard, so you can see which sleep tracker is actually accurate rather than which one feels accurate. It covers sleep staging, deep sleep, REM, and total sleep time, ranks all seven devices on the headline metric, and lets you open any device for a full per-metric breakdown. It also explains the single factor that decides staging accuracy, and the limits no brand can engineer around: consumer wearables infer sleep stages from heart rate, heart rate variability, and movement, not from brain activity, so stage-level agreement with polysomnography is far weaker than total sleep time agreement. Devices compared include Oura Ring, Apple Watch, Fitbit, and Garmin.
It is built by Kygo Health, no signup required. 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.