Device research record
WHOOP 4.0
Signals and sensors
From the device record. Fields the source does not state are left out.
- Maker
- WHOOP
- Form factor
- Wrist
- Series
- 4.0
- Family
- WHOOP Strap
- Signals recorded
- PPG, Accelerometer
- Also called
- WHOOP4, WHOOP Strap 4.0
What published studies show
Results quoted from 2 published validation studies, 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 |
|---|---|---|---|---|
| WHOOP 4.0 | 3.00%Mean absolute percentage error | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
| WHOOP 4.0 | 0.91Lin's concordance correlation | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
- WHOOP 4.03.00%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
- WHOOP 4.00.91
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 |
|---|---|---|---|---|
| WHOOP 4.0 | 8.17%Mean absolute percentage error | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
| WHOOP 4.0 | 0.94Lin's concordance correlation | ECG | n = 13, Home, during sleep, 536 nights | Dial et al. (2025)Independent |
- WHOOP 4.08.17%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
- WHOOP 4.00.94
Lin's concordance correlation · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
Sleep stages (4-stage)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| WHOOP 4.0 | κ = 0.37Cohen's kappa | Polysomnography (PSG) | n = 40, Sleep laboratory, 1 night | Schyvens et al. (2025)Funding not reported |
- WHOOP 4.0κ = 0.37
Cohen's kappa · vs Polysomnography (PSG) · n = 40, Sleep laboratory, 1 night
Schyvens et al. (2025) Funding not reported
Sleep vs wake (2-stage)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| WHOOP 4.0 | > 90% (all devices)Sensitivity | Polysomnography (PSG) | n = 62, Sleep laboratory, 1 night | Schyvens et al. (2025)Funding not reported |
- WHOOP 4.0> 90% (all devices)
Sensitivity · vs Polysomnography (PSG) · n = 62, Sleep laboratory, 1 night
Schyvens et al. (2025) Funding not reported
Comparisons
Head-to-head pages that name WHOOP 4.0 come first, then other comparisons for the brand.
- Whoop vs Apple Watch: What the Sleep-Lab Studies FoundMentions WHOOP 4.0
- Whoop vs Oura Ring: Which Tracks Sleep and HRV Better?Mentions WHOOP 4.0
- WHOOP 4.0 vs 5.0: PPG Sensor Upgrade and Recovery ChangesMentions WHOOP 4.0
- Ultrahuman Ring vs Oura Ring: Specs and Published EvidenceMentions WHOOP 4.0
- WHOOP vs Garmin: PPG-Based Recovery and Training AnalyticsMentions WHOOP 4.0