Secret mobile apps, which can be used by children to hide texts, images and videos from their parents, are drawing warnings and concern from parents and officials both.

Dan Tynan, editor in chief of Yahoo Tech Magazine, says the apps can look like ordinary functions such as a calculator, but when users enter a secret password, they have access to hidden files.

The apps are becoming so popular, a county district attorney in Alabama, Pamela Casey, posted a video on Facebook, warning parents about one app in particular called Calculator Percentage, or Calculator %.

The problem with these apps is they allow kids to hide their cyber-lives from their parents.  Fortunately, there's an easy way to keep your kids from using such apps, just turn off their ability to install apps without parental approval.