Oura Ring 4 isn't just a sleep tracker—it's a comprehensive health monitoring system that happens to excel at sleep. After wearing it for weeks and comparing it to polysomnography studies, I can confirm: this is the most accurate consumer sleep tracker available.
The magic is in the algorithms. Oura has been refining their sleep staging since 2013, and it shows. Their sleep stage correlation with sleep lab tests is genuinely impressive.
The Readiness Score combines sleep quality, heart rate variability, body temperature trends, and activity into a genuinely useful metric. The temperature tracking monitors skin temperature deviation from your baseline—a useful early warning system for illness or overtraining.
Battery life is solid at 7-8 days. The titanium construction is lightweight and comfortable enough for 24/7 wear.
The elephant in the room is the subscription. At $72/year ($6/month), it adds up: $565 over three years. However, you're paying for continuous algorithm improvements, cloud storage, and the most sophisticated health insights in the business.
Is it worth it? If you're serious about optimizing sleep and recovery, yes. The accuracy and insights genuinely help you improve. But for casual users, RingConn Gen 2 Air delivers 80% of the experience at 35% of the 3-year cost.