Are the circle sizes proportional?
The areas track the set sizes and the overlap distance tracks the shared count, so bigger means bigger. Exact-area two-circle geometry is genuinely impossible for some inputs, which is why every region also carries its printed count.
Can I make a three-set Venn?
Not yet. Two sets cover the common case; a three-set diagram with proportional areas is a different mathematical beast, and a fake-proportional one lies.
What do the printed numbers mean?
The number in each outer region is that set MINUS the overlap, and the number in the lens is the shared count, so the three visible numbers add up to the union.
Does my data get uploaded?
No. The diagram is rendered in your browser and exported locally.