FC-Compiler is an alpha version calculus-level compiler that simplifies tweaking parameters in math models. It uses FortranCalculus language for math modeling, simulation, and optimization based on automatic differentiation, minimizing code to the essential mathematical model, constraints, and objective function. Over 50 example problems are available as demos to help solve users' own problems. The software architect Joe Thames has developed calculus compilers and put industry problems and solutions into a textbook over 20 years to showcase calculus-level problem solving.