Fork

Tuning Fork -- DISCOUNT INTRODUCTORY PRICE $0.99 (RRP $2.99)

- Tap, flick, twist, or even sing to your phone to make it resonate like a guitar string!

- Tune any instrument: Themes for guitar, violin, cello etc. supplied. You can also download themes or even create your own!

- Can you create the Tibetan Singing Bowl effect?

- Can you teach yourself perfect pitch?

Fork uses a real-time ring resonator (instead of simply playing a sound file) -- sing a note into the iPhone and Fork will resonate sympathetically.

( EDIT: There is an issue with long loading time on some devices which I am aware of and currently fixing. )