The builder opens empty. Pick a starting rig to fill it in, then tweak from there.
Stamped as a title block on every export — diagram, maps & cable schedule.
Shows saved here stay in this browser. To move one to another device, or send it to someone, save it to a file.
Ctrl+Z (⌘Z on a Mac) undoes the last change. Click any line to go back to that point; undone changes stay listed so you can go forward again.
now: