Logseq is the best in my view.
All comments on this thread failed to suggest a decent note-taking app that isn't super convoluted.
I used Telegram as a way to quick jot notes for future use, reminders and whatnot, but I am trying to move out of that, so I started using https://simplenote.com/, but what a weird app. It logs me out if I don't use it for like 2 days, I don't like the fact that it has these titles because I don't need titles, I just need a place to paste content, and also it's not chronological like Telegram messages but also I can't reorder the notes as I wish, they are shown by most recent updated first, which is weird.
Anyway, all of that was ok if it wasn't for the weird syncing issues that started to happen recently: it takes sometimes hours for updates made in one device to be synced to other devices, I don't know, it looks like their server is broken or something.
I don't know why I'm writing this note anymore, but I think we could easily have a note-taking app with private notes writing to private relays on Nostr.
Discussion
Trying to find devs who agree, and are eager to work on a nostr-enabled alternative. If you know of anyone, please tag them or share this article with them:
nostr:naddr1qqxnzde38qersdf38qurxvf5qyw8wumn8ghj7un9d3shjtnd093k2mrfw4kjuum0vd5kzmp0qgs9pqy620l0jkgy2yaggr2qs25jk3wdtudeusmdn54e92yuuzglzeqrqsqqqa28jdz78c