Oura Ring 4 Review: The Smart Ring Redefining Health Tracking in 2025

The Oura Ring 4 is one of the most advanced wearable health trackers on the market today. This sleek, lightweight ring combines cutting-edge sensors with intelligent software to provide users with deep insights into their sleep, activity, recovery, and overall wellness. In this review, we’ll dive into the features, benefits, drawbacks, and everything else you need to know before deciding if the Oura Ring 4 is right for you.

Design and Build Quality

The Oura Ring 4 maintains the signature minimalist design that made its predecessors popular. Crafted from durable titanium, it is available in multiple finishes including matte black, silver, and gold, making it discreet and stylish enough to wear all day and night. The ring is also waterproof up to 100 meters, so it can handle swimming or showers without any concerns.

Fit and Comfort:
The ring is surprisingly lightweight (about 4-6 grams depending on size) and ergonomically designed to sit comfortably on your finger without feeling bulky. A proper fit is crucial since sensor accuracy depends on skin contact.

Features Overview

1. Advanced Sleep Tracking

Oura Ring 4 excels in tracking various sleep stages — light, deep, and REM sleep — giving you a comprehensive picture of your nightly rest. The ring also measures:

• Total sleep time
• Sleep latency (time to fall asleep)
• Sleep efficiency
• Restfulness and disturbances
• Heart rate variability (HRV) during sleep

These insights are presented in an easy-to-understand sleep score, helping users optimize their bedtime habits.

2. Comprehensive Activity Monitoring

Beyond sleep, Oura Ring 4 tracks daily steps, calories burned, and inactive time. Its motion sensors detect different activity intensities, from light walking to vigorous exercise. The new version includes improved sensors for more accurate step counts and activity recognition.

3. Readiness Score & Recovery Insights

One of Oura’s standout features is the Readiness Score — a daily metric that assesses how prepared your body is to take on physical or mental challenges. It factors in sleep quality, HRV, body temperature, resting heart rate, and previous activity levels to provide personalized recovery advice.

4. Temperature and Respiratory Tracking

Oura Ring 4 offers continuous body temperature monitoring, detecting subtle changes that may indicate illness or stress. Additionally, it tracks respiratory rate during sleep, giving early signs of potential health issues.

5. Enhanced Sensors & Battery Life

The ring integrates infrared photoplethysmography (PPG) sensors for heart rate and HRV measurement, as well as a 3D accelerometer and gyroscope. The battery lasts approximately 7 days on a single charge, with a quick charging feature that provides 100% in about 20 minutes.

6. Smartphone App Integration

The Oura app is user-friendly and visually appealing, delivering detailed reports and personalized guidance. It syncs seamlessly with Apple Health and Google Fit, allowing users to integrate data with other health apps.

How Oura Ring 4 Compares to Competitors

Compared to wrist-worn devices like the Apple Watch or Fitbit, Oura Ring 4 stands out for its focus on sleep and recovery rather than fitness tracking or smart features. It offers superior comfort for night wear and deeper physiological metrics. However, if GPS or real-time workout tracking is a priority, those wrist devices may be better.

Who Should Buy the Oura Ring 4?

The Oura Ring 4 is ideal for health enthusiasts, biohackers, and anyone who prioritizes quality sleep and recovery as part of their wellness routine. It suits people who want a subtle, stylish device that provides scientifically validated data and actionable insights. However, fitness buffs who require extensive workout tracking or smart notifications may find it less comprehensive.

Final Verdict

The Oura Ring 4 is a thoughtfully designed, highly accurate smart ring that excels in sleep and recovery tracking. Its long battery life, comfortable design, and meaningful insights make it one of the best health trackers for holistic wellness in 2025. While it’s on the pricier side and not perfect for all fitness needs, it offers unique value for those looking to optimize their health through data-driven decisions.