It's very nice, I hope it does well.

I may have missed it, but does this do collaborative editing between 2 or more people? That would be the thing that could convince me to use this or something like it. Otherwise it's just a really nice drawing app whose drawback (others would call it a feature) is that I have to get to it through a service.

What I'd really like to see is something that two or more parties could install locally, and collaborate interactively without a server in the middle, or only the lightest of facilitation by a server. Which is not what you're trying to do here and I apologize. What you've done is pretty sweet.