Comment by diablerouge

Super happy to see they're doing well and growing - so far the best collaborative whiteboard tool I've come across.

A few reasons:

1. No account needed, just send a link.

2. Speedier than alternatives.

3. Some kind of magic making it so that quickly drawn curves come out smooth and nice looking rather than jagged.

4. Open source!

5. A good UI, when so many other projects manage to screw it up.