Ultrahuman is an Indian company focused on sleep and metabolic tracking. Its Ring AIR is worn on a finger, while M2 uses a disposable glucose sensor worn on the upper arm.

How it works

Lights in the ring measure blood flow, while temperature and motion sensors track temperature and activity. Software estimates heart rate, sleep, recovery and stress. The glucose sensor has a fine filament under the skin. An enzyme reacts with glucose in tissue fluid and produces an electrical signal, creating a continuous graph of food and exercise responses.

Key considerations

Ring fit, cold hands and movement affect optical readings. Sleep and recovery scores are estimates. Glucose in tissue fluid can lag behind blood during changes, and each sensor is discarded after use. Glucose access, pricing and regulation vary by country. Ultrahuman provides wellness insights and does not replace diabetes care or medical diagnosis.