According to U.S. consultants Sparks and Honey in 2014, 41% of Generation Z spend more than three hours per day using computers for purposes other than schoolwork, compared with 22% in 2004. In 2015, an estimated 150,000 apps, 10% of those in Apple's App Store, were educational and aimed at children up to college level, though opinions are mixed as to whether the net result will be deeper involvement in learning and more individualized instruction, or impairment through greater technology dependence and a lack of self-regulation that may hinder child development. Parents of Gen Zers fear the overuse of the Internet, and dislike the ease of access to inappropriate information and images, as well as social networking sites where children can gain access to people worldwide. Children reversely feel annoyed with their parents and complain about parents being overly controlling when it comes to their Internet usage.