Massing is a spatial modeling app for architectural ideation and early design development. Start with simple geometry or a generated composition, then refine each element through direct manipulation or numeric input. XYZ handles, an Inspector, control-point editing, materials, rulers, and scale tools support precise modeling. Coordinated drawing views help with review and editing, while Random Massing offers a quick way to test new compositions. Projects are stored locally and can be exported as USDZ or OBJ for continued work in compatible software.