Andrej Karpathy conducted a two-month experiment to compare four sleep tracking devices: Oura, Whoop, 8Sleep, and Apple Watch with AutoSleep. He found Oura and Whoop to be the most accurate and consistent, providing similar scores that correlated with his subjective feeling of well-being each morning. The 8Sleep device performed adequately, while the Apple Watch and AutoSleep combination was deemed significantly unreliable, producing erratic scores with little correlation to his actual sleep quality. AI
RANK_REASON This is an opinion piece by a credible individual (Andrej Karpathy) analyzing personal data and product performance.
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