Fig. The inputs provided by the user are (i) the total energies of the main material and competing phases, (ii) the energies of native and extrinsic defects, and (iii) a high-quality density of states of the bulk compound. VTAnDeM uses these inputs to generate (i) phase stability diagrams in both chemical potential and composition space, (ii) the defect formation energy diagram, and (iii) a carrier concentration plot. The defect formation energies and carrier concentrations are generated on-the-fly for specified points in chemical potential space and composition space.