I emailed Litchi to ask if their app had a built in NFZ database.
This was the (utterly crap) response I received:
Nope, I’m none the wiser either… 
Does that mean it DOES have a database in the app? I’m 99% sure it doesn’t…
Does that mean it uses the FlySafe database in the drone? Possibly…
I’ll have to try taking off in a NFZ with Litchi and see what it does. I’m guessing it won’t bat an eyelid…