Your tool looks interesting, congrats on your beta launch! I'd be interested in the technologies you used to build the editor, especially the real-time collaboration part. What libraries are you using or is it something custom built? I'm working on something similar (https://www.nuclino.com) and we've been pretty happy with ProseMirror as the basis of our editor so far. Here's our HN post from a few weeks ago, if you're interested: https://news.ycombinator.com/item?id=11211241