Heatmap suddenly became popular when webmasters want to know where did the user click or look at. Websites like Crazy Egg, provides a heatmap generation system for webmasters. But most heatmap costs more than average adsense supported website can earn, those sites need a alternative.

ClickHeat requires PHP (5.1.6 and higher) with GD enabled to work. The post includes a sample image to show you what the end result looks like.