most shells will accept outputting from a silent command to a file, e.g. :> foo.txt (where : is the posix synonym to the true command)

This looks like a strong contender! Thanks!

I wasn’t precise, I meant many apps force some kind of rich-text editor that feels clunky and unnecessary, that’s what I want to avoid.

Since I’m already using NextCloud, NextCloud Notes seems like a good fit, I’m wondering how I missed it…