This is an ecash wallet stored on nostr (nip-60) and the UI is the work in progress chachi integration. NWC will work similarly with full wallet functionality but the UI is a bit simpler.
Discussion
I have only experimented with the nip-60 wallet on Olas and It doesn't seem very reliable to me. I've received many zaps on the nip-60 but I've never been able to view them.
That's unfortunate, this is still highly experimental. When I release I'll let you know and you can check if you see the nutzaps in chachi.