I just downloaded nvALT on Sonoma (14.3), and it runs, but looks a bit funky. The styling of some elements is slightly broken, but does not seem to affect the functionality. I haven't tested all the features though.
>Now I just try to use something that lets me keep notes in a folder and use it but then iOS becomes a mess unless I use iCloud
I didn't quite understand: do you want an app that syncs to iOS but not via iCloud?