CYTools is a high-performance computational geometry toolbox for studying Calabi-Yau threefolds arising as hypersurfaces in toric varieties. We first demo its geometry primitives: polytopes and cones. We then show a complete research pipeline, going from nothing -> polytope -> triangulation -> toric variety -> Calabi-Yau threefold. This includea a demo computation of certain properties of the toric variety and CY, such as intersection numbers and their K\"ahler cones. The perspective taken will be as a sandbox of geometries as well as the tools needed to study them.