If you already have perfect pitch, test it!
If not, then practice with this!
Choose to display the notes in Music Notation or as letters if you aren't versed in Music Notation.
Four instrument sound options are provided (Piano, Guitar, Trumpet, Violin.) If you play an instrument, this will allow you to best match the timbre of that instrument. (Most people find it easier to recognize the notes of the instrument that they play.)
Hit the play button to play a random note.
Then select what note you think it is. The note you select will be played for comparison's sake.
The card will turn green if you're correct and red if you're wrong.
Your score will increase a point if you're correct and decrease a point if you're wrong.
Verified working on iPhone 4, iPhone 5, as well as the original iPad.