Thanks for the link.
We’re only just getting started with FoldSpy (launched the middle of last week) so we’re still not doing the best job explaining it. 🙂
On the data we use: we collect the browser sizes from visitors to sites using FoldSpy Free. That data is processed nightly and fed back into the system. When you load FoldSpy on your site, the information is based on thousands of users browsers (588,822 so far, to be precise). So I’m confident it’s pretty accurate. But it will get more accurate as time goes by. We expect to have measured 1 million users browsers by the end of the week.]]>