This app was mentioned in 2 comments, with an average of 2.00 upvotes
I use an iPad with a combo of Dropbox for word docs & maps, music apps if want it in & the 5e spell list app. Usually switch between them
Just discovered a bestiary app on android which is now on my phone as well.
Edit: link for android 5e bestiary app https://play.google.com/store/apps/details?id=sk.libco.bestiaryfive