Oura Ring 4 is the next evolution of the revolutionary smart ring, designed to help you get up close and personal with your health. Oura Ring 4 is built around a breakthrough sensing technology, Smart Sensing, which adapts to your finger to deliver accurate, continuous data, day and night.

Hardware

Oura Ring 4 features a sleeker, fully titanium design and recessed sensors on the interior, enhancing both durability and wearability.

Oura Ring 4 is available in one design and six colors: Black, Silver, Stealth, Brushed Silver, Gold, and Rose Gold. It has an expanded size range, now available in sizes 4-15. We do not offer half sizes.

The sizing for Oura Ring 4 is slightly different from Oura Ring Gen3. If you're switching between these different ring generations or uncertain about your size, make sure to use the right Oura Ring Sizing Kit for an accurate fit. The Oura Ring 4 Sizing Kit includes white ring sizers, and the Oura Ring Gen3 Sizing Kit includes black ring sizers.

For the best fit and most accurate readings, align your ring so that the sensors are against the palm side of your finger.

Sensors

Smart Sensing is a new sensing platform designed to give you the most complete picture of your health. The research-grade sensors work with an algorithm that adapts to the unique structure and skin tone of your finger and your current activity to deliver the most accurate, continuous data, day and night—all while optimizing battery life.

Red and infrared LEDs measure blood oxygen while you sleep.

Green and infrared PPG sensors alternate to measure heart rate 24/7 and heart rate variability and respiration rate during your sleep.

Digital temperature sensor measures average body temperature variations

Accelerometer tracks movement and activity 24/7.