Does it work with both Android and iOS?

Yes, the Oura Ring 4 is compatible with both Android and iOS devices, with full feature parity on both platforms.

What's the difference between the regular and Renewed version?

The Renewed version has been professionally inspected, tested, and restored to like-new condition. It includes a new battery and carries the same warranty, but may have minor cosmetic marks.

How accurate is the sleep tracking?

Oura Ring 4 uses advanced algorithms and PPG sensors to detect sleep stages with clinical-grade accuracy, though individual variations exist based on fit and personal physiology.

💻 Tech & GadgetsOctober 21, 2026

Smart Health Ring with Sleep Tracking & AI Advisor

Track sleep, activity, and women's health with an advanced smart ring. AI advisor, 8-day battery, and accurate health metrics in one device.

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Product Comparison

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Oura Ring 4 - Gold - Size 8 - Smart Ring, Sleep, Activity, Women’s Health, AI Advisor, Up to 8 Days of Battery Life, Size Before You Buy, Android & iOS Compatible (Renewed)	Check Price on Amazon →

Key Features

Advanced sleep tracking with detailed sleep stage analysis
24/7 activity and calorie burn monitoring with AI-powered guidance
Women's health tracking including menstrual and fertility insights
Up to 8 days of battery life with wireless charging

Who Should Buy This?

If you're serious about health optimization and want a sleek alternative to bulky smartwatches, the Oura Ring 4 is perfect. It's ideal for fitness enthusiasts, women interested in reproductive health tracking, and anyone who values accurate biometric data without the bulk. The Renewed model offers the same premium features at a lower price point.

Buying Tip

Pro tip: Make sure to order the correct ring size before purchasing. Oura offers a free sizing kit to determine your perfect fit, which is crucial since the ring must fit snugly for accurate heart rate and sleep tracking. Many users recommend sizing up slightly if between sizes.