Download this app if: you're looking for a camera trigger.
Triggertrap - Creative ways of triggering your camera. The Triggertrap app has a sound sensor to trigger your camera and a range of tools to create beautiful timelapses.
IMPORTANT! Triggertrap requires the Triggertrap Mobile Dongle to connect your camera to your device! See below for...
Mobile Dongle Sold Separately — You need to buy the Mobile Dongle for this app to work, but it's worth it. This is fantastic for amateur & professional photogs who use their smartphones to take brilliant photos.