not sure if they are the best, but I've read about blinkist a while back (http://www.blinkist.com/en/ http://www.blinkist.com/en/). apparently their app uses so

not sure if they are the best, but I've read about blinkist a while back (http://www.blinkist.com/en/ http://www.blinkist.com/en/). apparently their app uses some smart nlp magic to give people summaries of non-fictional texts/books.