In December 2013, the number of available apps was 200,000, while in April this year it was around 250,000 - so the Store seems to be gaining about 50,000 new applications each four months, or over 10,000 per month. Microsoft also says that over 4 billion apps and games have been downloaded via Windows Phone Store until now.
Of course, Windows Phone Store can still not be compared to Apple’s App Store and Google’s Play Store when it comes to the number of applications hosted (the App Store and Play Store have more than 1 million apps each). But its steady growth is obviously great news for all Windows Phone users, many of whom have complained - in the beginning - about the limited number of available apps.
P.S.: The smartphone seen above is the Nokia Lumia 930, one of the world's first to run Windows Phone 8.1 out of the box.
source: Microsoft via WP Central