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This free tool shows which wearable estimates VO2 max most accurately: Garmin, Apple, Polar, Fitbit, Samsung, WHOOP, and Oura, separating independent validation from vendor funded validation. Only Garmin and Apple have genuine independent peer reviewed validation for VO2 max. 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.