Like most writers, I keep several apps around. Some I've always liked, some I used to like but now don't use much, and a few I turn to virtually every day. For me there are three of those every-day apps. Scrivener, the workhorse for just about any task. Byword, for quick sketches and direct posting to WordPress. And the current version of iAWriter, which is where I write short fiction and essays. Just what I want.