By the end of 2012, Microsoft, Yahoo, Google and AOL had all shed a considerable number of iOS apps from their collective portfolios. With the exception of AOL, each of the other companies managed to increase the number of apps they have in Apple’s iOS app store in 2013. And with the release of iOS 7 in the second half of the year, which required many development teams to update their apps, it is no wonder that all four companies saw a surge in app updates in 2013 as well.

I gathered data from online app services like AppShopper.com, 148Apps.biz and Apple’s own Search API in order to gain some insight as to what each company has accomplished in 2013. Each app listed under the company’s name was counted, along with the latest release date, category, number of updates made in 2013, whether or not the…