WebSource is a tool that allows you to compare the results in Google given two search terms. On the screenshot above I tested Firefox VS Chrome and the winner is Firefox of course. With only one months Chrome is very popular but you know, is Google soon. So WebSource has a simple interface and by typing two terms you can find witch is more popular in Google search results. And if you want to compare more than two terms just type tab from your keyboard and other fields will come out.