Localytics studied the thousands of Android, iPhone, iPad, BlackBerry and Windows Phone 7 apps using its real-time app analytics service. For all new customers of an app in 2010, Localytics looked for the first time each customer used the app and whether or not there was any follow-on usage through January 26, 2011. All one-time uses of apps were grouped into the quarter they occurred and calculated as a percentage of all new customers in the same quarter. After the break you can see more statistics about app usage.

Localytics provides engagement reports to help publishers identify their returning users and understand the frequency and length of their usage. As an example, the following Loyalty report shows the number of first-time app uses and all repeat usage. Those users representing columns toward the right of the table are the most loyal users.

Source [localytics]