content: Excellent application it is very usefull to read all pdf documents. Especially the following options are very helpfull for longa time reading 1. night mode reading option will give us black back ground with white letters  it will be reducing stress on eyes during low light conditions 2. Liquid mode of reading this option will convert the pdf docs to reading mode ie the letters are zoomed and bolded and the content will be adjusted to the display size and we no need to slide the docs to read.