OK: (1) Not advertising the Scribe (I doubt any Logosian wants it), and (2) Read on; this about Logos.
The Scribe came out a while back, and it's primary target was reading, combined with journaling. There's other competitors, generally in color but more expensive. The Scribe sort of works off a customers' book library.
This last week, they introduced the ability to write directly onto a Kindle book's text (eg marginal notes, etc). Previously, you wrote into a popup, with a small note identifier in the text (similar to Logos note icons).
The latest concept is very interesting. Essentially, you're writing (cursive, but later typing?) into graphics boxes that are re-sizable … the Kindle text wraps around them dynamically, and they anchor to the text-point. I been 'writing' now, and I really like seeing my notes, right along with the author's points. In my own Bible software, I can pair my notes to Bible verse anchors (sorted by date), though text only. In Logos, Passage Guides can pair notes, though a lot of 'stuff' is included.
Over the years, many Logosians have requested writing in their digital Bibles (similar to paper copies). Thinking about it, I couldn't see a cheap, efficient way. Logos, however, is the cat's meow on highlighting, and has well-developed anchor-based objects.
Now, seeing the Scribe's approach, it's really just a short-step in Logos, from anchored VFs, to anchored text/graphics boxes with text-flow-around. Enough demand? Definitely text; not likely cursive (for Logos).