Device research record

Oura Ring Gen3

14 Validation results
4 Comparisons
10 Articles

Signals and sensors

From the device record. Fields the source does not state are left out.

Maker: Oura
Form factor: Finger
Series: Gen3
Family: Oura Ring
Signals recorded: PPG, Temperature, Accelerometer
Also called: Oura Gen3, Oura Ring 3

What published studies show

Results quoted from 5 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).

Heart rate during exercise1 study

Device tested	Result	Reference	Sample	Study
Oura Ring Gen3mixed rest/stress/walking	9–14 bpm (group range)Mean absolute error	ECG chest strap (Zephyr BioHarness / Faros)	n = 45, Rest, cognitive stress, steady and intermittent walking in neutral/hot/cold chambers	Gielen et al. (2026)Funding not reported

Oura Ring Gen39–14 bpm (group range)
Mean absolute error, mixed rest/stress/walking · vs ECG chest strap (Zephyr BioHarness / Faros) · n = 45, Rest, cognitive stress, steady and intermittent walking in neutral/hot/cold chambers
Gielen et al. (2026) Funding not reported

Heart rate accuracy across devices →

Overnight heart rate1 study

Device tested	Result	Reference	Sample	Study
Oura Ring Gen3	1.67%Mean absolute percentage error	ECG	n = 13, Home, during sleep, 536 nights	Dial et al. (2025)Independent
Oura Ring Gen3	0.97Lin's concordance correlation	ECG	n = 13, Home, during sleep, 536 nights	Dial et al. (2025)Independent

Oura Ring Gen31.67%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
Oura Ring Gen30.97
Lin's concordance correlation · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent

Heart rate accuracy across devices →

HRV (RMSSD)1 study

Device tested	Result	Reference	Sample	Study
Oura Ring Gen3	7.15%Mean absolute percentage error	ECG	n = 13, Home, during sleep, 536 nights	Dial et al. (2025)Independent
Oura Ring Gen3	0.97Lin's concordance correlation	ECG	n = 13, Home, during sleep, 536 nights	Dial et al. (2025)Independent

Oura Ring Gen37.15%
Mean absolute percentage error · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent
Oura Ring Gen30.97
Lin's concordance correlation · vs ECG · n = 13, Home, during sleep, 536 nights
Dial et al. (2025) Independent

HRV accuracy across devices →

Sleep stages (4-stage)3 studies

Device tested	Result	Reference	Sample	Study
Oura Ring Gen3	76.0–79.5% (range across stages)Sensitivity	Polysomnography (PSG)	n = 35, Inpatient, 1 night	Robbins et al. (2024)Maker funded
Oura Ring Gen3	Not different from PSG for wake, light, deep or REMStudy finding (no single number)	Polysomnography (PSG)	n = 35, Inpatient, 1 night	Robbins et al. (2024)Maker funded
Oura Ring Gen3 (OSSA 2.0)	75.5% (light) to 90.6% (REM), per-stageEpoch-by-epoch agreement	Polysomnography (PSG)	n = 96, Home ambulatory PSG, up to 3 nights	Svensson et al. (2024)Maker funded
Oura Ring Gen3	κ = 0.35Cohen's kappa	Polysomnography (PSG)	n = 53, Two Korean sleep centres, in-lab PSG	Lee et al. (2023)Independent
Oura Ring Gen3	54.3%Epoch-by-epoch agreement	Polysomnography (PSG)	n = 53, Two Korean sleep centres, in-lab PSG	Lee et al. (2023)Independent

Oura Ring Gen376.0–79.5% (range across stages)
Sensitivity · vs Polysomnography (PSG) · n = 35, Inpatient, 1 night
Robbins et al. (2024) Maker funded
Oura Ring Gen3Not different from PSG for wake, light, deep or REM
Study finding (no single number) · vs Polysomnography (PSG) · n = 35, Inpatient, 1 night
Robbins et al. (2024) Maker funded
Oura Ring Gen3 (OSSA 2.0)75.5% (light) to 90.6% (REM), per-stage
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 96, Home ambulatory PSG, up to 3 nights
Svensson et al. (2024) Maker funded
Oura Ring Gen3κ = 0.35
Cohen's kappa · vs Polysomnography (PSG) · n = 53, Two Korean sleep centres, in-lab PSG
Lee et al. (2023) Independent
Oura Ring Gen354.3%
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Two Korean sleep centres, in-lab PSG
Lee et al. (2023) Independent

Sleep accuracy across devices →

Sleep vs wake (2-stage)2 studies

Only maker-funded evidence for Oura Ring Gen3 on this metric.

Device tested	Result	Reference	Sample	Study
Oura Ring Gen3	≥ 95%Sensitivity	Polysomnography (PSG)	n = 35, Inpatient, 1 night	Robbins et al. (2024)Maker funded
Oura Ring Gen3 (OSSA 2.0)	91.7–91.8%Epoch-by-epoch agreement	Polysomnography (PSG)	n = 96, Home ambulatory PSG, up to 3 nights	Svensson et al. (2024)Maker funded
Oura Ring Gen3 (OSSA 2.0)	94.4–94.5%Sensitivity	Polysomnography (PSG)	n = 96, Home ambulatory PSG, up to 3 nights	Svensson et al. (2024)Maker funded
Oura Ring Gen3 (OSSA 2.0)	73.0–74.6%Specificity	Polysomnography (PSG)	n = 96, Home ambulatory PSG, up to 3 nights	Svensson et al. (2024)Maker funded

Oura Ring Gen3≥ 95%
Sensitivity · vs Polysomnography (PSG) · n = 35, Inpatient, 1 night
Robbins et al. (2024) Maker funded
Oura Ring Gen3 (OSSA 2.0)91.7–91.8%
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 96, Home ambulatory PSG, up to 3 nights
Svensson et al. (2024) Maker funded
Oura Ring Gen3 (OSSA 2.0)94.4–94.5%
Sensitivity · vs Polysomnography (PSG) · n = 96, Home ambulatory PSG, up to 3 nights
Svensson et al. (2024) Maker funded
Oura Ring Gen3 (OSSA 2.0)73.0–74.6%
Specificity · vs Polysomnography (PSG) · n = 96, Home ambulatory PSG, up to 3 nights
Svensson et al. (2024) Maker funded

Sleep accuracy across devices →

Comparisons

Head-to-head pages that name Oura Ring Gen3 come first, then other comparisons for the brand.

Articles that mention Oura Ring Gen3

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Other versions

Oura Ring Oura Ring 4 Oura Ring Gen1 Oura Ring Gen2

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