It looks nice! The homepage did take >10 seconds to load, and the "get started" button is completely white for me unless hovering, probably a minor CSS bug. The main diagramming tool has a clean and professional look to it, but pretty much every action from dragging a box around to adding a new box has ~1s delay for me, which seems strange. Also I might make the menu on the left a little bigger, I'm on a monitor and I nearly missed it. Without the latency issue, seems like it could be handy though!