PEEP Wheres Quack is an educational app developed by WGBH Interactive. This iPhone app is available for free and falls under the category of Education & Reference. In this app, players are tasked with finding Quack, a quirky duck, who hides in various locations. Each location has different hiding places that affect the sound of Quack's voice, adding to the challenge. Players can listen carefully and use their observation skills to locate Quack.

The app is designed to be a digital version of hide-and-seek, where if the player finds Quack, he will hide again. The PEEP and the Big Wide World Where's Quack? app is based on the animated series PEEP and the Big Wide World, which aims to teach science to preschoolers through engaging storytelling and lovable characters. It offers a comprehensive science curriculum that attracts and engages children aged three to five years old.