Oura Ring 4 vs. Oura Ring Gen3

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 is powered by an algorithm that works with research-grade sensors to dynamically adapt to the finger and deliver accurate and continuous data, day and night. See Oura Ring FAQs here.

Here's how Oura Ring 4 compares to Oura Ring Gen3.

	Oura Ring 4	Oura Ring Gen3
Style	1 style	2 styles: Heritage and Horizon
Design & Material	Fully titanium exterior & interior Recessed interior sensors at 0.3mm	Titanium exterior, epoxy interior Raised interior domes (sensors) at 1.3mm
Finishes	Black Brushed Silver Gold Silver Stealth Rose Gold	Black Brushed Titanium (Horizon only) Gold Silver Stealth Rose Gold (Horizon only)
Sensing Platform	Accuracy is powered by Smart Sensing that dynamically selects the optimal signal path	Measurements powered by a fixed, static configuration of optical paths
Sizing	Sizes 4-15	Sizes 6-13
Battery	Up to 8 days	Up to 7 days
Charging Time	Typically between 20-80 minutes depending on the ring starting charge level	Typically between 20-80 minutes depending on the ring starting charge level
Charger	Grey and square USB-C to USB-C	Black and circular USB C to USB 2.0 standard-A cable
Sensors	Red and infrared LEDs measure blood oxygen levels while you sleep Green and infrared LEDs alternate to measure heart rate 24/7 and heart rate variability and respiration rate during your sleep Digital sensor measures your temperature variations Accelerometer tracks movement and activity 24/7	Red LEDs measure blood oxygen levels while you sleep Green LEDs monitor heart rate 24/7 PPG sensors read resting heart rate, heart rate variability, and respiration NTC sensors monitor your nighttime skin temperature trends Accelerometer tracks movement and activity 24/7
Dimensions	Width: 7.9mm Thickness: ~2.88mm Weight: 3.3-5.2 grams (depending on ring size)	Width: 7.9mm Thickness: ~2.7mm (Heritage), ~2.9mm (Horizon) Weight: 4-6 grams (depending on ring size)
Water Resistance	100m/328ft, suitable for sauna and water sports but not diving	100m/328ft, suitable for sauna and water sports but not diving
Operating Temperature	-10–54 ºC / 14–129 ºF Charging at room temperature recommended	-10°C–52°C / 14°F–125°F Charging at room temperature recommended