Best free Iphone apps for learning Japanese?

[MikuMarmalade]

I have a Iphone.
I already searched this q and got nothing.

What Iphone apps are good and FREE(Willing to pay up to$5 tops) for learning Japanese and is very interactive or what not.

By the way, I am intermediate, not beginner....

 

[mmmmmmmm14]

JPphrases. It's free to try though. But the free trial is very nice.