Managing documents has always been a cumbersome task on the iOS devices: iPad, iPhone and iPod touch, but manipulating PDF formatted documents is even more difficult. Mainly because PDF is a format normally used for read only documents.
There have been applications like Adobe Acrobat and the amazing PDFpen on Mac OS X to allow users to edit PDF documents on computers. Now with the prevalent of tablet devices it is natural to expect tools to be available on these devices too.
At the beginning; sounds like a long time ago but it has only been a year, the iPad was thought of by many as a content consuming device. Fortunately innovative developers begin to realize the power and potential of the iOS platform running in a form factor larger than the iPhone or iPod touch. Various developers started to release original iOS apps taking advantage both the form factor of the iPad and the innovative multi-touch UI of iOS. The first among these apps were Procreate, Sketcher and MagicPiano.