What is a good free guitar tuner for the iphone? (i'm a beginner)?

My friend just let me have his guitar because i wanna learn. It's a cheap guitar but i just wanna use it to learn the basics, Til i can afford a much much better one.
Right now it's really out of tune and i'm having trouble tuning it.
Do you know of any good FREE tuning apps for the guitar?

Added (1). Thanks i just downloaded! It is!
Btw i also play the piano a bit! I taught myself that one

'Guitartuna' is the one I used to have. Another free one is 'Guitar Tuner'.

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