We had 3 months free version. Very satisfied, but not the version and manufacturer information. According to internal data, this version is from 2011? Because we were happy with it, we have logically bought the premium version. Development in 2014? But we find no differences. The Aldiko site does not bring us any further. It is simply the great app for e-books on Android! Pity about the lack of development and version information, distinct from Free to Premium? With a german manual (epub) there were 5 star! For those who do not have: start with the free version - is totally ok!