The Digester

CNET finds the Oura Ring the most reliable smart ring for sleep, stress and illness signals, while Ultrahuman and Evie each trade strengths for accuracy or actionable insights.

CNET tested the Oura Ring, Ultrahuman Ring Air and Evie Ring over several months.
Oura delivered the clearest app experience and stood out for sleep tracking, stress monitoring and early sickness detection with new AI features.
Oura retails for about $349, requires roughly a $6 monthly membership for full features and needs recharging about every three days.
Ultrahuman Ring Air recorded workouts well but showed notable accuracy gaps versus an Apple Watch and was later banned in the US after a lawsuit by Oura.
Evie costs less, targets menstruation tracking and does not charge a subscription, but its app offers fewer actionable recommendations.
Common limitations across rings include susceptibility to exterior scratches, weaker fitness tracking than smartwatches and inconsistent measurement accuracy.

Oura Ring tops CNET tests as best smart ring for sleep and stress tracking

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