According to the iTunes listing, this app offer 300 pages of Dutch literature from Gerbrand Bakker, Roddy Doyle, Anna Enquist, Arthur Japin, Tessa de Loo, Marente de Moor, Frans Pointl, and more.
It's an interesting idea, but I'm not sure it's worth paying for. I'd much rather crack open which ever book I am reading at the moment and advance a few more pages.
What's more, the texts in this app are apparently mostly samples of larger works and include links to where you can buy the complete editions. So basically you're being charged for the privilege of reading samples of books which the publishers would like to sell you. Since this is effectively identical to advertising I would expect those samples to be free, not paid.
According to Querido, similar apps have been released in Germany and Sweden. I'm not sure if they changed the name, but if this is your sort of thing then it's worth looking for.