← All devices & tools
Category / 02
Measurement & tracking
Consumer tools that estimate sleep, recovery, activity, or physiological trends.
Reviewed modality dossiers
Product-version records
Identity-specific records. Evidence may still be indirect when studies used earlier models or a broader modality.
001
Oura Health
Oura Ring 4
A consumer smart ring that estimates sleep, activity, nighttime HRV, temperature trends, and other wellness metrics.
Same-technology evidenceOpen product record →002Eight Sleep
Eight Sleep Pod 5
A connected mattress-cover system that heats or cools each side of a bed and provides proprietary sleep tracking.
Modality-level evidenceOpen product record →