By any app, you mean also no Nostr apps?
Asking because it's actually my question, can NWC be used for apps that don't use Nostr protocol, for example messaging apps?
nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqywhwumn8ghj7mn0wd68yttsw43zuam9d3kx7unyv4ezumn9wsqzqtw3gr9gpkmzhneh047mu6xj922m4fqar8zmf9c60qsy4a6evpg6c2uuxc has my attention
solves an important ux problem:
how do i easily "bring my bitcoin" to any app
first use felt like a magical experience!
currently trying to learn more
Discussion
Yes, NWC can be used for any app.
It uses Nostr as backend for communication between the wallet and app, but the user does not need to have Nostr keys to use it