Hey, I think it Would be really nice to be able to use Tapatalk for Mobile Apps on forums using NodeBB. They have a nice API so maybe you're interested on connecting to it or working around. Not much else to explain.

Tapatalk - Connecting Communities

Tapatalk the world's leading mobile platform for building great communities online

(tapatalk.com)

Just a suggestion, loving NodeBB with or without it!