Yeah I use keet to move text & files between devices.
Basically like sync thing
It's pretty crappy for instant messaging & chat groups though.
Discussion
i used keet a lot... though I think for instant messenger is still not the best
It's great for private voice & video calls but I'd use simplex to co-ordinate the calls.
Nostr is really good for a persistent identity.
If someone is verified by myself on Nostr I can then connect via a 1 time Simplex link. If the link later breaks, it's easy enough to re-establish later.