Out of frustration with the built in Mac Notes app, and with the loading times of Notion, I made my own while waiting in airports on the way to and from a holiday:

https://notes.probabletrain.com/

It was a handy excuse to try out YJS, as I (for no good reason) wanted it to sync live without conflicts, despite it not really being a multiplayer application. It can be opened across tabs on the same machine with updates propagating live across tabs, or by signing in with Google, can be opened across devices/browsers (with live syncing via websockets). I needed this so I could sync notes between my work and personal laptops.

Some other features:

- Keyboard friendly (but very mouse unfriendly)

- Markdown 'preview': typing markdown adds styles without changing what you typed. For example, '#' will still be visible in headings. The only markdown supported is headings, bullet points, and inline code.

- Good luck getting any use out of it on mobile

- Is a PWA, so I can open it on Mac with CMD+Space, 'notes', Enter

It does exactly what I need it to do and nothing more, and is extremely user-unfriendly.