It looks really good. Lots of great features. I love the website! 1 I won’t be using the app though.
The marketing angle is that it’s native to macOS and takes full advantage of the OS. That’s cool, but I end up doing work on Linux, Windows, and macOS these days and it’s nice to have the consistency of an editor that works on all of them.
I created a lil reference page for Flexbox and CSS Grid (I don’t have much of CSS Grid done yet; it’s coming soon) today. I usually use the guides at CSS-Tricks (A Complete Guide to Flexbox and A Complete Guide to Grid), but I wanted to create something organized the way I like it.
I’ll be improving the design and adding properties for a while. I hope you find it useful!