Apple’s latest mobile operating system, iOS 4, is already accounting for one-half of all iPhone web traffic, according to online advertising network Chitika. In looking at over 9 million iPhone impressions across its advertising network, Chitika found that iOS 4 edged iOS 3 by eight-tenths of a percent to be the dominant OS only one month after being officially released.

Looking more deeply, iOS 4.0 – the version released on June 21st – is the dominant single version at 44.5%. Version 4.0.1 – the latest official release for the iPhone 3G, 3GS and iPhone 4 – clocks in at only 5% of the market, not surprising given that it was released less than a week ago.

Of the iOS 3.x variants, the most represented is 3.1.3 at 29.8%. As it is the highest released version of iOS 3.x for iPhones and iPod Touches, this result should be expected. The next step down, 3.1.2 (released in October, 2009) commands 14% of all iPhone traffic.

Version % of All iPhone Traffic
4.0.1 5.36%
4.0 44.57%
3.1.3 29.87%
3.1.2 14.04%
3.1 1.88%
3.0.1 1.19%
3.0 2.06
2.x 0.99%


Daniel Ruby
Research Director, Online Insights
Chitika, Inc.
+866.441.7203 x966