Secret Knock app for iPhone and iPad

Secret Knock is hands-off magic to control your iPhone or iPod Touch at a distance, invisibly.

It works by monitoring tiny vibrations you create. It can “feel” you drum your fingers, tap your foot, or pat your pocket.

When you tap out your “secret knock” pattern, it lights up with a fake phone call to get you out of that boring meeting ... awkward date ... or chat with Aunt Betty.

Upgrades let you define your own knock patterns, with a variety of actions, like displaying photos or videos, playing audio, and much more.

Like any app that uses the accelerometer, Secret Knock must be running in the foreground to receive vibration data.