The Windows Phone Marketplace and the Amazon Appstore are the fastest growing app stores

Microsoft’s Windows Phone 7 Marketplace and Amazon’s Appstore are the fastest growing app stores according to Distimo and CSS Insight’s App Vu Global Report.

The Windows Phone 7 Marketplace saw the largest quarter over quarter growth in 2011 and may soon overtake RIM’s BlackBerry App World in terms of the total number of apps available. The Windows Phone 7 Marketplace had more than 80,000 apps at the beginning of April, up from 60,000 at the end of January.

Although still the smallest app market, Amazon’s Appstore is also growing quickly thanks to the success of the Kindle Fire. According to the report, the Amazon Appstore’s number of available apps grew by 40 percent in the fourth quarter of 2011.

Overall, the iPhone App Store is still the biggest app store and is still adding apps at a faster rate than its closest competitor, Google Play.

At the end of 2011 there were almost 1.4 million apps in app stores worldwide, 53 percent were free or freemium and 47 percent were paid.

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