Flurry has released its latest research results comparing the iTunes App Store, the Amazon Appstore, and Google Play, and on its face, it looks like users with open wallets are headed to Apple's and Amazon's offerings over Google. The mobile research and advertising company found that for every $1 spent per user on in-app purchases in the App Store, 89 cents was spent in the Amazon Appstore and just 23 cents in Google Play. To get those numbers the agency looked at "a basket of top-ranked apps that have similar presence" across all three platforms and whose "primary business models are in-app purchase[s]." The selection of apps had a total of 11 million active users per day, and revenue was measured from mid-January to the end of February.

The numbers don't come as a big surprise — previous research has said that the iTunes App Store pulls in four times as much income as Google Play. What it does show, however, is that Kindle Fire users and those who manually install the Amazon App Store onto their Android devices are four times more likely to spend money on in-app purchases than your average Google Play user — something that may sway more developers to join the 31,000 apps offered in Amazon's store.