HyperSizer is a structural sizing and design optimization software tool that works in a feedback loop with finite element analysis (FEA) to automatically search for solutions that minimize weight and maximize manufacturability. Although it can also be used on metallic structures, HyperSizer is particularly applicable to complex composite materials, providing the capability to optimize the architecture of large structures—like space vehicles, aircraft, railcars, or even ships—ply-by-ply and element-by-element.