Archipad: Sketch and Doodle to Scale
Archipad is a scale aware sketching program, meaning sketches are automatically scaled to the real world based on user preferences. Simply establish the scale on the drawing pad and begin doodling. Users can zoom in and out to develop specific areas, rotate layers or the entire drawing to tryout different options, and share sketches with others. Drawings also can be exported to a CAD application to prepare a working conceptual design. Other features include the ability to duplicate shapes multiple times, create multiple layers, and duplicate or flip layers.