The Predictive tab of a BuiltWith Pro report shows where the source of the leads in your report came from, from a technology perspective back to 2011. This information can be used to determine where new leads that fit into your report will come from in the future.
The category group defaults to the same category group of your report if it is based on a web technology. By clicking on items in the technology list the tool lists how many leads we have in the system, how many of the results in your report used to use that technology and the amount of sites in that new lead list that may at some stage in the future be in the current lead list report.
You can create a new list by pressing the “Technology Report” button. For a working example of this see “How to Generate a Predictive Lead List” knowledge base article.