Section
Wearables
Watches, rings and trackers compared from published specs
Smartwatches, smart rings, screenless bands and sports sensors: what they claim to measure, what independent tests show, and what the subscription actually costs.
Science explainer
Sleep Tracker Accuracy: What Validation Studies Show
Sleep tracker accuracy is strongest for sleep versus wake and weaker for stages. Dated PSG papers, not a hands-on lab test.