Satromizer is an app available on the iPhone described as a "multitouch glitch tool".

As Syverson (the creator) explains: 

     To use the Satromizer, simply touch the screen where you want to add a glitch. You can use multiple fingers to glitch more than one area at a time. To reset the image, just double tap. To load new images, tap the info button. You can load in images from your Photo Library, take a new photo with the Camera, or save your current glitch to the Photo Library.

     Adjust the JPEG compression level with the slider to experiment with different looks. Lower JPEG quality levels glitch faster and easier, and higher settings create more stripe and offset patterns.

It's obviously a multitouch tool that's extremely responsive to touch, yet it's unclear what actions do what to the image...

Satromizer is named so after Chicago new media artist Jon Satrom, who is known for glitch art. Check out his site to get a flavor of his work.