Paper by FiftyThree for iOS

Paper enables you to express your creativity, using a wide range of drawing tools. No matter your skill level, this app helps you create stylish pieces.

Pros

Automatic stylization: Paper's included drawing tool is a fountain tip, so everything you draw gains a certain flourish.

Beautiful interface: You can visually select the type of drawing tool that you want, and then select your color with a single tap. It's elegantly laid out, very easy to use, and very intuitive.

Rewind feature: By rotating your fingers in a counterclockwise motion, you can "rewind" through the previous actions you've executed. Rewind is easy to use and allows you to undo a mistake without damaging your work.

Cons

Very limited free version: The free version of Paper is very limited. The worst part is how they flaunt all the tools you don't have access to. It's a very cleverly executed way to get you to pay more for an expanded toolkit, but it makes it a little more difficult to just sit back and enjoy the free version.

Bottom Line

If you're looking for a great drawing application, Paper is well worth a download. The fountain tool creates beautiful sketches and is fun to play with, whether you're an artist, a designer, or just looking to have some fun.