In my full Oura Ring 4 review, I address the smart ring's early criticism and the state of the so-called 'smart ring revolution' as a whole. When you look at the Oura Ring's design, charging, and everything you get from the app, it's no wonder the Oura Ring is becoming more and more popular in the fitness tracker market by the day. But comparing Oura Ring vs. Samsung Galaxy Ring that doesn't have a membership fee, and even the Apple Watch, I can't be the only one who's curious about how much more innovation we'll see in this category. Let's break down where we're at now by going through the Oura Ring 4 features, including how to use the Oura Ring with the redesigned Oura app experience.