Children's Countdown Timer

iPad, iPhone, Android

Teaches: a visual timer utility

CTR Review

This nicely designed timer slowly reveals an animated surprise when the time is up, along with an advertisement in the free version. You can unlock the paid version in the parent options for $.99 to get rid of the ads. Note that your tablet probably already has a built in timer that does the same thing -- showing a ring that gets smaller, without the fun pictures (or ads).