No doubt, iPad is an incredibly useful gadget for many people also including app developers. If you want your iPad to help you develop various iPhone apps, the sketch app AppSketcher should be able to help you.
AppSketcher is a practical sketch app developed by Bald One Media, and designed to offer iPhone app developers a convenient way to design user interfaces of their iPhone apps on iPad. The iPad app features an intuitive user interface and various useful tools so you can easily add frames, text and sketches on the preloaded iPhone interface featuring optional portrait or landscape viewing mode, and the sketch app also comes with 3 different pen sizes and 6 ink colors. Moreover, you can also create folds for different projects, and sharing them with your co-workers via Email or sync with your Dropbox account.
AppSketcher with a size of 2.3 MB is compatible with iPad running 3.2 or later. The iPad app is free for a limited time at present. If you’re interested, jump to App Store for more details.