Luna Band

The long version

Luna is a Hyderabad health-intelligence startup founded by Amit Khatri, who previously built Noise into one of the largest wearable brands in the world, and the Luna Band is its first device. The pitch is that you should not have to read a dashboard: there is no screen, and you interact with the band by talking to it — through Siri on iPhone you can log a meal, note a symptom or record how you feel, and it goes straight into your record. The sensing side is a research-grade optical array paired with a high-fidelity 6-axis IMU, sampling every second and tracking VO2 Max, HRV, stress, respiration, skin temperature, sleep stages and a fitness-age score, for 10+ days per charge. The interesting part is LifeOS, an on-device model that merges that data with your context and returns an actual schedule — sunlight walk at 7:30, protein at 10:00, caffeine cutoff at 16:30 — rather than a pile of graphs. Third-party micro-apps plug into the same baseline, and there is no subscription. Luna has not published a water-resistance rating yet.