The Apple App Store has come a long way since opening up for iPhone users in 2008. Since then, other marketplaces like Android’s have also been fast playing catch up and it comes as no doubt that smartphone app marketplace is one of the hottest areas in the coming years. A study by Research2Guidance notes that this “industry” can reach $15 billlion by 2013. Here is the projection of the installed user base provided by the study

2009 : 100 million
2010 : 310 million
2011 : 550 million
2012 : 775 million
2013 : 970 million

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