Neat; simple but I like it. One concrete thing that jumps out at me as I play around with it: I keep instinctively trying to hit Ctrl+Z to undo, which doesn't work (and then I remember there's a button). Might be nice to make that shortcut work.
Also: I enjoyed this:
> No BS
> Browserboard is written by two people in their spare time who aren’t thirsty for advertising dollars. We have no reason to spam you or violate your privacy.
A thought: any interest in porting to Sandstorm? It seems like the app would be a perfect fit, and giving people an easy way to run it themselves gives you an out if it gets too popular for you to keep running it for free. If you're not familiar:
Relevant blog post: https://sandstorm.io/news/2014-07-21-open-source-web-apps-re...
(Disclosure: I am one of the more active contributors to Sandstorm)