Yes, the Oura Ring 5 is noticeably smaller
Source: The Verge
Size comparison
From top to bottom: Oura Ring 5, Oura Ring 4 in ceramic, Oura Ring 4 regular, and Oura Ring Gen 3.
This is not an Oura Ring 5 review—those details will come later after I’ve had a chance to test the new durability, battery life, and software updates. In the meantime, I wanted to answer a frequently asked question that shows up in many Oura Ring comment sections.
Yes, the Oura Ring 5 is smaller and lighter than the Oura Ring 4.
For those considering an upgrade, I’ve provided photographic size comparisons of the Oura Ring 5 against the Oura Ring 4 (regular and ceramic versions) and the Oura Ring Gen 3.
Sizing matters
Smart ring sizing is crucial because the ring must fit comfortably while housing the necessary sensors and electronics. A smaller, lighter ring can improve comfort and wearability, especially for users who find the previous generation a bit bulky.