IA Writer offers writers a minimalist environment for composition. As you write, you are not distracted by formats, fonts, and the normal trappings of a word processing program. You basically have a blank screen on which to type your thoughts and words. There's something interesting about writing in this manner. You aren't distracted by whether you should use this font or bullets. You simply type your text. I can see how composing in this environment would be attractive. IA Writer Pro is available for $19.99 for both the iPad application and the Mac application, which I have found equally useful.