sylvia on Nostr: What's the absolute simplest note-taking app, just like a whiteboard, online? I ...

What's the absolute simplest note-taking app, just like a whiteboard, online? I currently use Google Keep frequently. Before, I used Google Docs, but Google Keep is easier to use offline.
It's mainly to transfer text between my phone/laptop/tablet, both ways. Should also work offline. For instance, things like a grocery list. And it doesn't need to be any more complicated than a big chunk of text.

Any Nostr options for doing this? It's not for public consumption, but it doesn't need to be extremely private either. Could I just use an npub/nsec to create something that could easily be edited in both places?

(I used Nostr a little bit many months ago, and am now dipping my toes in again, forgive me if I'm missing something obvious).

#asknostr #degoogling