Find out which microphones are compatible for the iPhone and iPad in this article 5 iPhone Microphones Reviewed. Ken Theriot, Owner and co-founder of Home Brew Audio, reviews compatible microphones for the iPhone so you don't have to pass on voice-over gigs when you're on the road in this VOX Daily article
Hope this helps!
A variety of apps have worked well using my ipad 3 and my ipad 1.
They include the following:
Enjoy and let me know what you think!
Thanks. I'll check them out. I've been using GarageBand with a new Apogee MiC, but being used to ProTools at home, it leaves a lot to be desired.