Agile Partners’ GuitarToolkit (iTunes Link) provides a bundle of guitary goodness all wrapped up in the Appley goodness of your iPhone.

First off there’s a tuner. Using the built-in microphone on your iPhone, you can use the GuitarToolkit’s chromatic tuner to sort yourself out. Alternate tunings aren’t an issue and you can even create your own if whatever weird one you’re using isn’t available.

Potentially more useful for guitarists to carry around in their pockets, however, is the scale and chord library. There’s half a million chords squeezed into this thing.

You can use the Chord Finder function to click in the fingerings and find out what the hell chord it is you’ve been playing for the last year.  Cm?  Really?

What else?  Well it can handle six and twelve string guitars, four, five and six string basses as well as banjos, ukes and mandos.  If you’re a leftie, don’t worry as you’re catered for too – it’ll tweak itself to show you everything for your topsy-turvy, left-handed world, you crazy mutant.

Last, and possibly least, it’s got a metronome that includes different sounds and time signatures.

Guitar Toolkit costs $9.99 from the iTunes store. I’ve got it. You should get it. If nothing else, you can impress your friends with the fact that you can ‘strum’ your finger across the strings to sound the chords.

Geeky.