Device research record
Oura Ring 4
Signals and sensors
From the device record. Fields the source does not state are left out.
- Maker
- Oura
- Form factor
- Finger
- Series
- Ring 4 / 5
- Family
- Oura Ring
- Signals recorded
- PPG, Temperature, Accelerometer
- Also called
- Oura Ring4, Ring 4, Oura Ring 5
What published studies show
Results quoted from 1 published validation study, each against a clinical reference. A result applies to the model and protocol tested, not to every model the brand sells. From the wearable accuracy database (v1.0.0).
Overnight heart rate1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring 4 | 1.94%Mean absolute percentage error | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
| Oura Ring 4 | 0.98Lin's concordance correlation | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
- Oura Ring 41.94%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
- Oura Ring 40.98
Lin's concordance correlation · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
HRV (RMSSD)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Oura Ring 4 | 5.96%Mean absolute percentage error | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
| Oura Ring 4 | 0.99Lin's concordance correlation | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
- Oura Ring 45.96%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
- Oura Ring 40.99
Lin's concordance correlation · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
Comparisons
Head-to-head pages that name Oura Ring 4 come first, then other comparisons for the brand.
- Whoop vs Oura Ring: Which Tracks Sleep and HRV Better?Mentions Oura Ring 4
- Oura Ring Gen 3 vs Gen 4: Is the PPG Sensor Upgrade Worth It?Mentions Oura Ring 4
- Ultrahuman Ring vs Oura Ring: Specs and Published EvidenceMentions Oura Ring 4
- Oura Ring vs Apple Watch: Finger PPG vs Wrist PPG AccuracyMentions Oura Ring 4