Oura Ring 5 Review: A Significant Leap in Smart Ring Comfort and Accuracy

The hardware revision addresses two documented failure points in 24/7 wearable tracking: finger interference during sleep and signal variance across skin tones and finger geometries.

Dimensions and durability

The Oura Ring 5 measures 6.09mm wide and 2.28mm thick. The Ring 4 measured 7.9mm wide and roughly 2.88mm thick. Gizmodo reports that the dimensional reduction removes the prior model's tendency to dislodge during showering, dishwashing, and lateral sleep position changes.

IP68 certification is retained. Water resistance is rated to 100 meters. Oura explicitly excludes scuba diving and jet skiing from the supported use envelope, despite the depth rating. The casing finish options are brushed silver, deep rose, gold, stealth, black, and silver.

Sensor stack

The LED array delivers higher output than the Ring 4. Signal pathways are restructured to maintain photoplethysmography accuracy across a wider range of finger diameters and melanin levels. The stated objective is reduced variance in heart rate readings across the user population.

Gizmodo's testing scenario focused on continuous wear during sleep. The reviewer notes that prior wrist-based devices, including the Apple Watch and Whoop, were removed mid-session due to comfort complaints. The Ring 5 is the first device tested where overnight wear proceeded without comfort-driven removal. The implication is direct: a wearable that stays on the finger generates continuous data, while one removed mid-session produces gaps.

Sleep tracking accuracy is not benchmarked against polysomnography or clinical-grade equipment in the available coverage. Battery life under continuous heart rate monitoring, charging time per cycle, and on-finger duration per charge are likewise not detailed in the published review.

Pricing and positioning

Two price tiers are active. Black and silver finishes list at $399. Brushed silver, deep rose, gold, and stealth list at $499. The Ring 4 launched in 2024 at $349 to $499 depending on finish. Entry pricing has increased by $50 while the premium ceiling is unchanged.

Subscription cost is not disclosed in the reviewed material. Oura's service tier operates separately from hardware cost and materially affects total cost of ownership over a 24-month window. Buyers should account for the recurring component before treating $399 as the all-in figure.

The data supports a buy verdict for users prioritizing continuous sleep tracking where prior wrist-based devices failed due to comfort. For users already comfortable with wrist-based accuracy, the upgrade case is weaker: the sensor revisions target known variance gaps but lack independent clinical validation in the available coverage.