Autodesk offers digital artists like illustrators, designers, architects, painters, and concept artists a wide variety of fast and powerful digital creative sketching tools. The SketchBook drawing and painting app features both stylus and touch input to sketch ideas quickly. Alias delivers sketching utility for product design, concept modeling, surfacing, and visualization. Formit supports BIM-based 3D sketching. AutoCAD and AutoCAD LT both allow for freehand sketching.