Nice idea, badly implemented
The people behind this app would do well to let someone who actually uses it point out all the flaws. For example, managing the library once a collection is added is somehow hidden behind a long press of the mystical “box with lines above it” button (which otherwise shows which tabs I’ve unknowingly opened). The consistency of the authors has to be praised though: removing bookmarks is achieved through a similarly obscure interaction with one of the other enigmatic buttons on the bottom of the screen. And what did “random article” do to deserve its prominence? Given its usability the app’s price is fair though.