Oura Ring 4
Titanium smart ring: recessed PPG sensors, 4-7 day battery and category-leading sleep/HRV algorithms behind a paid membership. Superseded by Oura Ring 5.
4.3 / 5
★★★★★ ★★★★★ Highly recommended
Strengths
- 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
Watch outs
- Oura Membership at £5.99/month is required to access the bulk of features - it adds £71.88 to the first-year cost
- 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
- 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)
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Research-based verdict We have not yet handled this ring ourselves. This review is compiled from the manufacturer's published specifications, independent validation studies, and aggregated owner reviews - and we say so wherever a claim depends on them. See our methodology for exactly how we work.
By Rob Griffiths2 min read
- 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 - £5.99/month (£69.99/year) or $5.99/month ($69.99/year)
- Launch price (Heritage)
- £349 / $349 (Stealth and Gold from £399 / $399)
- Pricing as of
- May 2026