Here’s an interesting statistic.

The top 20 grossing apps in the iOS App Store are all free apps, according to online app analytics platform Distimo.

In fact, from the top 100 grossing apps, only 9 of them are paid apps, with prices ranging from $0.99 to $8.99, but most hovering around the $2.99 mark.

The Google Play store is similar. There, only three apps in the top 100 grossing apps are paid, with the first paid app coming in at position 33.

The revenue for these free apps seems to be coming predominantly from in app purchases.

It certainly seems to validate the idea of the freemium model, and proves that customers are willing to pay for in-app purchases to upgrade their experiences.