BioDecay is described as 'A high-precision pharmacokinetic modeling engine for science-driven supplement optimization. Visualize personalized absorption and decay curves for water, caffeine, creatine, and protein in real time using dynamic compartmental models. Stop guessing, start optimizing. No forced accounts' and is a nutrition tracker in the sport & health category. There are more than 10 alternatives to BioDecay for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Apple Watch apps. The best BioDecay alternative is FoodYou, which is both free and Open Source. Other great apps like BioDecay are MyFitnessPal, Cronometer, Caffeine Health and YAZIO.