Oura is a brand that has played a major role in popularizing the concept of connected rings—wearable devices that track health and fitness metrics. With the recent release of the Ring 5, the older Ring 4 has become a more budget-friendly option for those looking for high-quality health tracking without the higher price tag. The Oura Ring 4 is known for its sleek, titanium design, lightweight construction (ranging from 3.3 to 5.2 grams), and waterproofing up to 100 meters. It offers continuous tracking of sleep, stress, and heart rate, and can last up to eight days on a single charge. The device is currently available at Fnac and Darty for 265 euros, down from its original price of 399 euros. The Oura Ring 4 has improved on its predecessor by replacing the epoxy interior with a fully titanium build. This change has allowed the sensors to be embedded within the ring’s structure, eliminating the protruding parts that could cause discomfort. The ring is so discreet that it can be worn comfortably throughout the day and even during sleep. It is also resistant to extreme temperatures, making it suitable for use in saunas or during rainy runs. Available in six different finishes and sizes ranging from 4 to 15, it caters to a wide range of preferences and body types. A size guide is included to help users choose the right fit before purchasing. While the absence of a screen is a benefit—reducing distractions and eliminating the need for frequent charging—it can also be a drawback for users who prefer checking their health data directly on their wrist. The Ring 4 uses an advanced 18-channel multi-wavelength PPG sensor system to monitor various health metrics, including SpO2 levels during sleep, continuous heart rate and heart rate variability, and skin temperature to detect early signs of illness or track the menstrual cycle. It automatically detects over 40 types of physical activities and tracks heart rate zones, making it a versatile fitness tracker. Sleep tracking is arguably the Ring 4’s greatest strength. Oura is widely regarded as a leader in this area, offering detailed sleep scores and insights into each stage of the sleep cycle. The accompanying app has been redesigned for the Ring 4, offering a clear and user-friendly interface. However, access to advanced features requires a monthly subscription fee of 5.99 euros, which has been a point of criticism for some users. Without this subscription, the full potential of the device is not accessible, limiting the overall experience.