Playpen is an app created by a father who found that simply giving their kid an iPhone locked to an app with Guided Access* wasn't enough. Kids soon get bored of playing the same game or looking at the same photos, and sometimes giving them unfettered access to YouTube isn't something parents want to do. Playpen is the answer.
With Playpen, parents can configure which activities they want to allow their kids to access and then enter Guided Access mode. That way, they don't get bored and parents have peace of mind because they know exactly what their child is doing.