Ever wonder who uses the mobile web more often, Android or iPhone owners? Well Chitika, a web-tracking company, can help you answer that question … on an hourly and daily basis.

Chitika directly compares iOS and Android web usage across smartphones and tablets in the US. They present a pie graph at the top of their site that shows you the usage split from the last 24 hours (it’s a constantly changing graph with a six hour delay). During the last 24 hours, iOS was dominating with 69% of mobile web usage while Android claimed 27% (and “other” rounded out the rest of the usage).

Further down the page is an interactive graph that displays eight days of data for Android, iPhone, iPad, iPod and “other.” Moving your mouse across the graph lets you see and hour-by-hour breakdown.

Granted, this isn’t an end all be all analysis of every smartphone in the US. Chitika takes their data from phones within their ad network. Here’s an explanation of how they determine the percentages on each graph:

Pie Chart: The percentage reported in the pie chart represents a rolling twenty-four hour average of mobile traffic, with a six hour delay to ensure maximum continuity within the data. These percentages are simply the count of each particular group (iOS, Android, and Other) divided by a total count of all mobile traffic observed.

Line Chart: The line chart highlights the use of each operating system on an hourly basis. For each hour, the methodology is the same as in the pie chart, except shown using a time series. For example, if Android impressions made up 15% of all mobile impressions on April 19th at midnight, and 16% at April 20th at midnight, the chart would highlight this growth (and show all of the hours in between).

This information may not be crucial to your web app testing, but it is awfully cool!