My favorite app on the nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8 has nothing to do with #bitcoin or #nostr
OpenLib is very awesome if you like reading and you have an android
UI is great and no sign up needed to download and read your favorite titles straight from the app