Paper doesn't provide in-app pressure support. Instead, Paper's pens and brush use speed to control the opacity and line width. It's not the first app to take this approach, but Paper locks you into both its speed formula and tool sizes. You can learn the system after a bit of practice, but it's not fun. (Tip: The slower you move the eraser, the smaller the erased area will be.)

Paper's pencil tool may be my favorite part of the app; it's the best implementation of a pencil and sketching on a tablet I've seen, even without pressure sensitivity. This is in part due to the way you use a pencil versus other tools: You naturally make quick, thin lines, and the app is fine-tuned for that sort of use.

The watercolor brush is less precise, but its effects are lovely: The color blending reacts in such a way that I often felt like I was mixing real watercolors. Where it fails, however, is in its speed formula. It's almost impossible to paint a large swath of canvas without leaving much lighter spots or creating large blotches in the middle. Also, its brush, which is about the size of a finger, feels too big and clumsy on most drawings; unlike the finer-tipped pencil and fountain pen, there's no way to color anything of detail and not have it look sloppy.

You might be able to solve this by zooming in on the canvas, but unfortunately Paper can't currently do that. (A posting on the company's support forum indicates that that feature may be coming in a future update.) Without zoom--and unless you're gifted with a stylus or a finger--there's no way to create really detailed drawings.