Oura · current · checked 2026-10-06
Oura Ring 4
Still compelling for sizes 4, 5, 14 or 15, especially at a verified official discount.
Smaller or larger fingers and value-seekers in the Oura ecosystem.
Decision summary
Strengths
- Wide size range
- Mature app
- Five-to-eight-day claim
Limitations
- Membership cost
- Older and larger than Ring 5
- Finish stock varies
Cost
Ownership cost
Hardware plus the currently required plan, using the dated reference price. Tax, shipping, optional services and replacements are excluded.
Full insights require Oura Membership.
Fit and hardware
What you wear
| Sizing | Use the Ring 4-specific sizing kit. |
|---|---|
| Sizes | 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 |
| Weight | 3.3–5.2 g |
| Finishes | Silver, Black, Brushed Silver, Stealth, Gold |
| Sensors | Red, green and infrared LEDs; Photodetectors; Temperature sensor; Accelerometer |
| Outputs | Sleep; Readiness; Activity; Stress trends; Cycle insights |
| GPS and routes | No built-in GPS is stated. Supported routes, distance and pace use the phone’s location services; the phone must be carried. Checked 2026-10-06. |
| Charging | Size-specific charger; typically 20–80 minutes. |
| Water | Manufacturer states 100 m; not for diving. |
| Strength training | Useful for passive trends, not live workout guidance. Remove metal rings for loaded grip work to reduce pressure, scratching and injury risk. |
Compatibility and data
App and account
Compatibility
iOS and Android.
Platforms: Apple Health, Health Connect, Strava
Data handling
An account and cloud-connected app are used; review the current privacy and deletion controls before connecting third-party services.
Brand account required. Health-platform integration and export scope vary; verify the exact current app options.
Evidence
Sources and limits
Oura has the deepest published evidence base, but results remain generation- and population-specific.
- Oura Ring 4 specifications ↗official · checked 2026-10-06
Price, dimensions, battery and water resistance.
- Oura Ring 4 support ↗official · checked 2026-10-06
Sizes, sensors and features.
- Oura location services ↗official · checked 2026-10-06
Phone-assisted route, distance and pace tracking.
- Smart-ring meta-analysis ↗study · checked 2026-10-06
Evidence variability and limits.
Not medical advice. Consumer wellness signals cannot diagnose or exclude a condition. Discuss concerning symptoms or readings with a qualified clinician.