The Apple App Store has hundreds of thousands of apps for the various devices powered by the iOS. Some of the top developers are making plenty of money, but the majority of developers are struggling just to break even. A survey conducted by marketing firm App Promo found that 59% of apps don't break even, while several other estimates place the number at 80% or higher. There are a number of factors that can contribute to the lack of success including the sheer number of apps making it difficult to even be found and revenue of just 70 cents for a 99 cent app. Some developers also feel that the search system to find apps is lacking and could use some serious improvement, and others felt that a demo system might help to convince consumers that an app would be worth a $5 or $10 purchase.