Apple Notes alternative for Samsung device I am looking for an free and ad-free solution which is comparable to Apple Notes, which I used some years ago on an iPad.

I want to be able to take simple plain-text notes, and access them both on a computer (on OS X) and on a Samsung S7. I don't need fancy features (Evernote-like), in fact I much prefer simplicity.

The Memo app that comes with the phone is perfectly sufficient for my needs, and looks like just what I want. Except there's one big problem: I can't figure out how to access the notes on a computer.  Syncing with "Samsung Cloud" is turned on for Memo in the settings.

I don't expect to be able to find a third-party app that provides such functionality for free, as whoever provides the service will need to pay for server costs.  But I did expect Samsung to provide such functionality, given that Apple has had it for a long time ...
I'd say 'Google Keep' is one of the best ones to use:
https://play.google.com/store/apps/details?id=com.google.android.keep