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Oura Ring 4
Titanium smart ring with recessed PPG sensors, 4–7 day battery, and the most refined sleep and HRV algorithms in the category — behind a paid membership.
4.3 / 5
☆☆☆☆☆
★★★★★
Pros
- The most refined sleep-stage and HRV algorithms in the category, repeatedly validated against polysomnography in independent testing
- Titanium build with recessed PPG sensors that survive daily wear — most users report two-to-three years before noticeable scuffs
- Four-to-seven day battery in normal use, with a small, fast-charging puck included in the box
- Multiple sizes (US 6–13) and three finishes (Heritage, Stealth, Gold/Rose Gold) for fit and aesthetics
- Genuinely innovative women's-health and metabolic-load metrics that competitors are still catching up on
Cons
- Oura Membership at £4.99 / $5.99 per month is required to access the bulk of features — total first-year cost is closer to £400 / $415
- No always-on heart rate or live workout heart-rate broadcast — fitness use is supplementary rather than primary
- No continuous SpO2 reading — overnight SpO2 is a spot-check during sleep, not 24/7
- Higher-priced finishes (Stealth, Gold) command a £50–£200 premium for cosmetic differences only
- Closed ecosystem — your historical data lives inside the Oura app and is difficult to export in a portable form
Specifications
| Specification | Value |
|---|---|
| Form factor | Ring (inner-face sensors) |
| Material | Titanium with PVD coating |
| Weight | 3.3–5.2g depending on size |
| Sizes | US 6 to US 13 (sizing kit shipped pre-purchase) |
| Finishes | Heritage, Stealth, Gold, Rose Gold, Brushed Silver, Black |
| Sensors | Green/Red/Infrared PPG, NTC body temperature, 3D accelerometer, SpO2 |
| Water resistance | 100m / 10 ATM (do not press buttons underwater — there are no buttons) |
| Battery life | Up to 8 days advertised; 4–7 days typical with continuous heart-rate enabled |
| Charge time | ~80 minutes (proprietary charging puck included) |
| Connectivity | Bluetooth Low Energy |
| App support | iOS 14+ / Android 8+ |
| Subscription | Oura Membership required — £4.99/month or $5.99/month ($69.99/year) |
| Launch price (Heritage) | £349 / $349 (Stealth and Gold from £399 / $399) |
| Pricing as of | May 2026 |