Quantum-Technology Computer-Aided Design (QTCAD) is a finite-element method (FEM) simulator used to predict the performance of solid-state spin-qubit devices before their production. This unique tool is a significant cost-saver enabling exploration of many design scenarios. QTCAD calculates the envelope functions and energy levels of electrons or holes confined in nanostructures within k.p theory by solving the Schrödinger and non-linear Poisson equations self-consistently. QTCAD enables prediction of exclusive qubit performance metrics such as electron or hole confinement, Coulomb blockade and gate fidelity, among many others. Full list on our website, more features are under development. You can become a QTCAD beta tester and help us achieve its development. Benefits will be offered over the future licenses upon release!