Melissa,
Yes, ProCreate is for iPads (as far as tablets are concerned), but it looks like there is a desktop version available.
Thank you, Suzanne, for posting my work on this thread. I would like to note that Dragon Fly was done using ProCreate, while the other two (Awakening and Impact) were done on clay board using felt tip pen. I enjoy drawing on my iPad, but I also enjoy using traditional mediums. Both of the pieces below were done in ProCreate. I love the fact that I'm carrying around a complete art studio (water colors, oils, pastels, pens, crayons, pencils, and airbrush) in my iPad.