一般来讲付费应用程序的入榜时间是免费应用程序的三倍左右。免费程序在竞争力方面显然弱于付费程序。比如Doodle Jump占据前五名榜单长达140天，RedLaser 也有73天的时间。
App store analytics startup Distimo just released its May report, and zoomed in on the average number of days applications across various categories maintain their top rankings in Apple’s App Store. Analyzing data collected from November 2009 to April 2010, the company found that paid applications in the Top Overall, Games, Business and Entertainment categories stay in these categories for 27, 39, 59 and 38 days on average, respectively.
Free applications stay in the Top 100 for a significantly shorter time in those categories, with 19, 21 and 39 days on average, respectively. The exception to the rule seems to be the Entertainment category, in which free apps stay in the Top 100 for a slightly longer period of time than paid applications; 43 days compared to 38 days.
The likely reason: there are approximately three times as many paid apps for the iPhone than there are free ones, so there’s less competition in the gratis segment.
In the App Store, the majority of paid applications that have been in the Top 100 Overall during the entire period of 6 months measured fall into the Games and Entertainment categories. The paid applications that have been in the Top 5 for the longest period of time are Doodle Jump (140 days), RedLaser (73 days) and Skee-Ball (68 days).
The paid application that has been number one for the longest period of time is Skee-Ball (24 days). The free applications that have been in the Top 5 for the longest period of time are Facebook (12 days) and Paper Toss (7 days).
Zooming in on the iPad, the highest ranked paid iPad application in the Apple App Store in April 2010 was Pages, followed by GoodReader for iPad and Pinball HD. The highest ranked free iPad application in the Apple App Store was iBooks, followed by The Solitaire and Break HD Free.