It's the app that this
Reddit is about... they have both a DM and a Player App. Get either one, then message the creator of that reddit thread for a dropbox invite, when you get the invite you can import the XML files in the dropbox into the app and v'oila, you will have access to all the 5e content from your phone. If you use the character app, you can even put your character in there and have Rurik at your finger tips.
I'm using their GM app (but I have the character one too for the weekly game that I play in).