"For Babble's annual roundup of the 50 best apps for kids, we looked at some basic criteria that you and your family might also consider before downloading an app. Every app we tested had to have received an age-appropriate rating ("4+" in Apple's case; "Everyone" in Google's). We also considered whether the app allowed parents to participate in, or at least oversee, whatever their kids were doing onscreen. In addition, even if the apps were designed to do nothing more than keep kids busy while you're in line at the store, there had to be some positive or educational element to them."
Via John Evans