title_body: Dual reading (for translation comparison) I have started using my tablet for reading epubs and I have found a lot of different versions of the same book. 
  
  So, is there any application that allows me to compare, i.e. to see both versions in a split screen? 
  
  I thought it would be easy to find this because it is such a useful utility!
  
  I have tried the 10 most used application for reading epubs and no single one allows me to do this.
upvoted_answer: There's a special PC/Android app that for that: Aglona Reader.
  It uses its own XML format, though.
  I.e. you'd have write your own converter.