02Excellent
Ring Gen 3
$299+$6/month
sleep-trackingHRVring
99.9% accuracy for resting heart rate. Best sleep tracking among wearables. Ring form factor is more comfortable than wrist bands for sleep.
Quality Score10/12
Purity
Evidence
Transparency
Value
Moderate Evidence
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Ingredients & Purity
Titanium ring with photoplethysmography sensors.
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Scientific Evidence
Consumer trackers are ~60% accurate for sleep staging vs lab. Good for trends, not absolutes.
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Brand Transparency
Extensive data available in app. API access.
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Value Assessment
$299 + $6/month. Premium but best sleep-focused tracker.
Why Not Alternatives?
Apple Watch is bulky for sleep. Whoop is better for athletes but worse for sleep. Oura excels at overnight recovery metrics.