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The Luna Smart Ring R02 is a lightweight sleep and fitness tracker worn on the finger. It continuously monitors sleep, heart rate, stress, blood oxygen, activity and menstrual cycles, and an AI assistant turns the data into a personalized report. At 2mm thick and 2.5g, it is meant to be worn around the clock, including overnight and in water. It suits people who want passive health tracking without a wrist screen; it does not display anything itself, so everything is read in the app.
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Rated 4.6 out of 5 from 33 ratings. Buyers respond well to the light, unobtrusive fit and the breadth of tracking, though the sizing system is a recurring point of friction.
The Luna Smart Ring is a wearable health and fitness tracker worn on the finger. Its multi-sensor setup continuously tracks sleep, heart rate, stress levels, blood oxygen, physical activity and menstrual cycles.
A built-in AI assistant delivers a personalized report and guidance on wellness and daily habits.
The ring has a slim 2 mm profile and weighs 2.5 g. It has an IP68 waterproof rating. It uses its own sizing standard, which differs from standard ring sizes, so check the sizing before buying.
