There are loads of great effects apps out there. The range, complexity and sheer level of innovation just amazes me at times, but even so, one of my favourite apps for decimating any sound is still nils. I love the simplicity of its interface and how I can use it to do at times unspeakable things to my sound.
I also love this developer’s other apps too, and I’d certainly recommend checking them out. They are loads of fun, and a few of them are free too.
So if you like bit crushing things, give nils a try. I love it.