Apple’s App Store remains the largest but the Google Android Marketplace should match it in size by the end of July, while Blackberry App World will double in size within a six-month period, according to new research from Distimo.

Android far exceeds Apple in free applications (58 percent of the 50 most popular publishers have already developed applications for non-Apple platforms) but has barely one-third the total number of paid apps that are available in the Apple App Store. Daily downloads in the top 100 overall paid and free applications for iPad exceed 500,000, while daily revenue in the top 100 paid is approximately $400,000, excluding in-app purchases.

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