https://www.developer-tech.com/news/2018/jul/06/apple-ios-app-store-10-years-old/

Apple is preparing to celebrate the 10-year birthday of the iOS App Store, over which it's seen phenomenal growth and success for developers.

The App Store was introduced on July 10th 2008 with 500 apps. At the time, it was already impressive for a mobile app store.