The tool is called “Family Tree Visualization” and it can be found here:
The tool analyzes your family tree (from the gedcom you upload) and then gives you an interactive display of the tree on your screen. But don’t stop there, move the mouse pointer around, click on the places where I have marked in red below (see left side too), scroll the mouse wheel, experiment => the darn thing is full of information about your tree. This is an excellent tool that is both fun and useful.
The display only shows your ancestors, but the statistics include summarizations from all of your tree! So upload a full gedcom. Use this on your desktop or laptop computer because you need the mouse. No iPads here!
“Wow, this is amazing.” If this is old news to you, then I can only say “Why didn’t you tell me before?”