I use this for a short-cut driven note-taking app I've built, https://mmap.it. Excited to see it get some recognition, it's by far the best wysiwyg editor I've found. Best of luck with outline!
The current title calls it a "react Dropbox Paper clone". Since you use it, I'm curious if you have a sense of how close it gets, and what the gaps are?
Full disclosure: I don't have a ton of experience with Dropbox Paper. From what I've seen there aren't many gaps. There are a few markdown elements in paper that I think have cleaner styling (i.e. lists). I also prefer the automatic syntax highlighting and table UI with dropbox paper. That being said, as far as inline markdown editors go, they are quite close.