The Quantum Modeler is an interactive simulation and design tool for the upcoming quantum revolution, with a strong emphasis on applications to quantum computing and nanotechnology. It features a simulator of quantum computers for simulating a quantum computing on a classical computer and a simulator of quantum mechanics for simulating quantum phenomena. It is being developed by Dr. Charles Xie to promote simulations as an alternative pathway to learning quantum science and engineering. The Quantum Modeler will be available as a Java app (standalone) and a TypeScript app (Web-based), which will be interoperable.