Inkling is portable and wireless, which allows you to sketch digitally away from your computer.
Ideal if you prefer to sketch on paper rather than use a graphics tablet or pen display.
Layers can be created while sketching.
Files can be saved in various file formats for use with other applications.
Files can be exported for editing in certain graphics programs, including the widely-used Adobe Photoshop.
Produces vector graphics which allows individual lines to be easily edited and entire drawings to be resizing without losing quality.