Oura Ring Gen 4 Review: Is It Worth the Upgrade?
An in-depth review of the Oura Ring Generation 4, covering sleep tracking, activity monitoring, health insights, battery life, and whether it is worth the investment.
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Mattias started Praana with a simple goal: make wellness information clearer, more honest, and easier to apply in everyday life. He researches emerging health tools, biohacking strategies, and performance practices—translating complex science into practical guidance people can actually use.
The Oura Ring has established itself as one of the most respected wearable health trackers on the market, favored by biohackers, athletes, and health-conscious individuals who want detailed health data without the bulk of a traditional smartwatch. The Generation 4 builds on the already impressive Gen 3 with improved sensors, longer battery life, and enhanced algorithms for sleep and recovery tracking.
After wearing the Oura Ring Gen 4 daily for over six weeks, here is my detailed breakdown of what this wearable does well, where it falls short, and who it is best suited for.
Design and Comfort
The Gen 4 maintains the sleek, minimalist ring design that has become Oura's signature. Available in multiple finishes including Heritage (rounded) and Horizon (flat), the ring looks like a piece of jewelry rather than a health tracker. It is lightweight, waterproof to 100 meters, and comfortable enough to wear 24/7, including during sleep, which is the entire point.
The sizing kit (available free before purchase) is essential, as proper fit affects sensor accuracy. The ring should be snug but not tight, worn on the index finger for optimal readings. Build quality feels premium, and the titanium construction is durable enough for daily wear without worry.
Sleep Tracking
Sleep tracking is where the Oura Ring truly excels. The Gen 4 uses improved infrared LED sensors and an upgraded accelerometer to provide highly detailed sleep data.
What It Tracks
The ring breaks down your sleep into light sleep, deep sleep, REM sleep, and awake periods. It provides a Sleep Score based on total sleep time, efficiency, restfulness, REM and deep sleep duration, latency (how long it takes to fall asleep), and timing relative to your optimal bedtime.
Accuracy
In my experience, the Oura Ring Gen 4 provides sleep stage data that aligns closely with how I feel upon waking. While no consumer wearable matches the accuracy of a clinical polysomnography study, the Oura Ring is widely considered among the most accurate consumer sleep trackers available. The deep sleep and REM detection feel notably improved over the Gen 3.
Sleep Insights
The app provides actionable insights based on your sleep patterns, including personalized bedtime recommendations, trend analysis over time, and correlations between your daytime behaviors and sleep quality.
Readiness and Recovery
The Readiness Score is one of Oura's most valuable features. It combines data from your sleep quality, heart rate variability (HRV), resting heart rate, body temperature trends, and recent activity levels to provide a daily score indicating how prepared your body is for physical and mental demands.
A high readiness score suggests your body is well-recovered and ready for intense activity, while a lower score may indicate that prioritizing rest and recovery would be beneficial. I found this feature particularly useful for making training decisions and recognizing early signs of overtraining or illness.
Activity Tracking
The Oura Ring is not a fitness tracker in the traditional sense. It does not have GPS, and it is not designed to replace a sports watch for detailed workout metrics. What it does well is track overall daily movement, including steps, active calories, and training frequency.
The Gen 4 introduces improved workout heart rate tracking and automatic activity detection. However, for dedicated athletes who want detailed running, cycling, or strength training analytics, a dedicated sports watch or fitness tracker may be a better primary device. The Oura Ring complements rather than replaces these tools.
Heart Health Features
The Gen 4 includes continuous heart rate monitoring, SpO2 (blood oxygen) readings, and detailed HRV tracking. The cardiovascular health insights provide a useful overview of heart rate trends, and the HRV data is particularly valuable for understanding recovery and stress patterns.
Battery Life
Oura claims up to 8 days of battery life for the Gen 4, and in my testing, I consistently achieved 6 to 7 days with all features enabled. Charging takes about 60 to 80 minutes using the included USB-C charging dock. The improved battery life over the Gen 3 means less time worrying about charging.
The Subscription Factor
One important consideration is that the Oura Ring requires a monthly membership ($5.99 per month) to access most advanced features beyond basic sleep and activity tracking. Without the subscription, the ring provides only basic data. This ongoing cost should be factored into the total cost of ownership.
Who Is the Oura Ring Gen 4 Best For?
The Oura Ring is ideal for people who prioritize sleep optimization and recovery, those who want health tracking without wearing a bulky watch, biohackers and quantified-self enthusiasts, anyone who wants discreet health monitoring that looks like jewelry, and people who already have a sports watch for workouts and want complementary recovery data.
It may not be the best fit for people who want a primary fitness tracker with GPS, those who prefer a one-time purchase without subscriptions, or individuals who want a large display for real-time data during workouts.
Final Thoughts
The Oura Ring Gen 4 solidifies its position as the gold standard in sleep and recovery tracking. The combination of discreet design, accurate sensors, actionable insights, and improved battery life makes it an exceptional tool for anyone serious about optimizing their health from the inside out. The subscription cost is a drawback, but for those who use the data daily to inform their lifestyle decisions, the investment may well be worth it.
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Key Research
- A large 2022 meta-analysis found that vitamin D supplementation was associated with reduced risk of autoimmune disease (BMJ, 2022).
- The Endocrine Society recommends adults at risk of deficiency maintain serum levels of at least 30 ng/mL (Journal of Clinical Endocrinology & Metabolism, 2011).
- A 2019 meta-analysis found vitamin D supplementation reduced the risk of acute respiratory infections (BMJ, 2019).
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Fitness & Recovery Guide for a comprehensive overview