As far as whitespace/color goes, both apps look similar (at least to my non-designer eyes) to Byword and Textroom:

http://itunes.apple.com/us/app/byword/id420212497?mt=12&...

http://textroom.sourceforge.net/images/odtexport1.png

The fonts are not the same the relative font sizes are a bit different (Dustin's has bigger text).