Most iPad drawing apps take a rather old-fashioned approach. They try to mimic paper and pencil, or paint and canvas, and of course they never get it quite right, even with pressure-sensitive styluses and fancy paint engines. Archipad takes a different approach: it recognizes that you’re drawing on a computer screen and embraces that fact, letting you draw to scale, in 3-D and with perfect lines, all my using a finger or stylus.
Archipad For iPad: ‘Sketch And Doodle To Scale’