If you’ve worn more than one of these, you’ve seen them disagree: a green Whoop recovery next to a middling Oura readiness next to a half-full Garmin Body Battery. None is lying. They’re built from different inputs with different philosophies, so “disagreement” is expected — and understanding why makes all three more useful.
Oura’s readiness is sleep-led. It blends your sleep, recovery (HRV and resting heart rate), body temperature and recent activity into a 0–100 score, with a strong emphasis on how you slept. It’s measured primarily overnight from the finger, so it’s a “how recovered did you wake up” number more than a live one.
Whoop’s recovery is HRV-led, leaning heavily on your overnight heart-rate variability and resting heart rate relative to your baseline, expressed as a percentage. It pairs that with a “strain” score for exertion. The philosophy is explicitly training-focused: how ready are you to take on load today.
Garmin’s Body Battery is a running energy gauge, 0–100, that charges with rest and sleep and drains with stress and activity through the day. Unlike the other two, it’s designed to move in real time, so it answers a slightly different question: how much is in the tank right now, not how recovered you woke up.
They weight different signals (sleep vs HRV vs continuous stress), sample at different times (overnight vs all-day), and answer subtly different questions. So a clash usually isn’t a contradiction — it’s three lenses on the same body. The practical advice: pick the one whose philosophy matches your goal, learn its baseline, and don’t average across devices. A score only means something against its own history.
Vitra sits in the Oura camp — it reads your ring’s overnight signals against your own baseline — but with a difference: instead of a single proprietary number, it explains why the score is what it is in plain English, so you’re not left trusting a black box.
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