If your app won't be relaying events then relays are not the right tool... The storage interface I designed could act as a relay though (saving events intact) or otherwise can optimize the data format for local consumption
Discussion
It will be relaying events. Of course.
Are there any Nostr apps that don't relay? Not even a zap or a ♥️?
That is not what relaying is
I thought relaying is to deliver a message from one client over a relay to another relay or client.
Yes. Most clients just connect to relays. They do not do cross-relay data transfer.
Also check Matrix.
I can't. I'm on vacation and left my laptop at home, to keep myself from working all day.
I'll check it tomorrow evening.