In January 2011, Qihoo claimed that it was the second most popular web browser in China (after Internet Explorer), with 172 million monthly active users, 44.1% of Internet users in China. The true figure is much lower (in the 2-7% range) according to multiple independent sources. As of November 2014, the Qihoo browser is the 5th most popular browser in the United States.
The high usage numbers are in large part due to the software being very difficult to uninstall. Furthermore, whenever a user attempts to install another browser, a warning pop-up claims that the new browser is unsafe and should not be run.