Oura Ring 4 makes the smart ring slimmer, comfier, and more accurate

A new version of Oura’s smart ring has been announced, the Oura Ring 4. The new model is slimmer, has recessed sensors for greater comfort, and uses new algorithms to provide more complete and accurate measurements.

The 4th-gen smart ring is also now available in a greater range of sizes, and with a new black finish described as combining a deeper color and improved durability …

Both myself and my colleague Laura Rosenberg have been impressed with the previous generation rings.

While you have to look very closely indeed to see that the 3rd-gen model is anything other than a conventional piece of jewellery, Oura says it has made the new model even more discreet.

The lightweight, all-titanium design of Oura Ring 4 features recessed sensors for a smooth interior shape and thinner profile, making it more comfortable for 24/7 wear. 

There are more sizes, and an improved black finish.

Oura Ring 4 will be available in an expanded range of twelve sizes (4-15) and in six colors: Brushed Silver, Gold, Rose Gold, Silver, Stealth, and an updated Black finish that features a glossy, tungsten PVD coating for improved durability and a deeper black look.

The company says data collection will be more complete, and more accurate, thanks to a new algorithm known as Smart Sensing.

Smart Sensing helps make Oura Ring 4 the most accurate iteration of Oura Ring yet. To determine exactly how much better, Oura conducted an external research study in August 2024 in which 60 participants—with diversity across gender, age and skin tone—wore both Oura Ring Gen3 and Oura Ring 4 overnight in a sleep clinic. The findings showed that Smart Sensing enabled:

• 120% improvement in signal quality for blood oxygen sensing (SpO2), translating to a 30% increase in accuracy in average overnight SpO2 measurement
• 15% more accurate breathing disturbance index (BDI) thanks to the higher signal fidelity
• 7% fewer gaps in the daytime heart rate
• 31% fewer gaps in the nighttime heart rate

The Oura Ring 4 starts at the same $349 as its predecessor. It’s available for pre-order from today, with delivery from October 15.

Photo: Oura