DemoLoop

DemoLoop, informally referred to as "Screen Saver", is an app that displays a looping screensaver on iOS and iPadOS devices in Apple retail stores and authorized resellers. It is installed by Apple retail employees to prevent screen burn in on demo devices. This app launches every time the device has been inactive for a period of time. Holding 3 fingers on the display at once brings up a secret menu for DemoApp.app, which plays back the file located at. The contents of that file may vary between device and OS versions, as well as time.

Installation
This app can be installed without permission by Apple by pasting  into a web browser and downloading the file. The .ipa file is available from

An older version is available from  and

An older version is available from  and

An alternative method for a kiosk-like experience on iPads is to enable Guided Access mode.