, a metrics firm that tracks mobile application stores, says the Mac App Store has about 73 percent fewer apps than did the iPad App Store after its initial two months. Distimo divides the iTunes App Store into separate iPhone and iPad retail outlets.

Despite the small number of available titles, the average Mac app is generating half the sales revenue of iPad software among the top 300 apps for both stores, according to Distimo.

Strong revenues for Mac apps can be credited in part to the higher selling prices, which are, on average, priced seven times higher than iPhone apps and three times higher than iPad apps. The average price for a top 300 app in each store is $11.21 (Mac), $4.19 (iPad) and $1.57 (iPhone), according to Distimo.

Freebies may also be a defining reason the Mac App Store is becoming a moneymaker. Only 12 percent of apps in the Mac App Store are free, compared to 35 percent for iPhone and 29 percent for iPad.

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