If you wonder what that might be, see here. Actually, it is not just "natural note taking," but "premium natural note-taking."
As you might well expect, I don't think that there is any "natural note-taking." It's an acquired skill that can—at best—become second nature. And "premium natural" seems to me a contradictio in adiecto.
This is not to disparage the application, but only the advertising for it. It's too easy ... I know, but I can't help myself. I especially like the recent advertising for Dunkin Donuts that I noticed last week: "You name it, we brew it." A word that I won't spell out immediately came to mind.
1. It's a four-letter word that starts with "sh" and ends with "t'.