What is the app that makes you sound like a chipmunk when you record a video?

Recently, I've been seeing tons of videos of people recording for about 30 seconds and they sound like a chipmunk. I don't know if it's JUST for the iPhone or for Android, but I'm trying to find out what it is. Can someone give me the name of the app? Thanks.

The app i use is called Helium Video Booth, there is a free version and a paid version. The paid version allows you to adjust your tone to really low or really high. Though on the free version you still sound like a chipmunk:) This app is on apple devices, I'm not too sure if its on any others. Hope this is the app you're looking for! :)