The world's most accurate measure of energy expenditure, powered by doubly labeled water. Used as the gold standard method of measuring free-living metabolism for over 40 years but, until now, available only in an expensive research setting. Calorify was the first to bring this proven and precise measurement to market by building out the largest lab of its kind in the world and developing new processes to make doubly labeled water faster, cheaper, and available in an at-home setting.