Great app!
I love Justins apps... they are from a guitarists perspective! Better interface than most and does what it says on the tin. Allows for fretboard training several ways - naming notes or naming by fret and a few quiz modes. I really would like to see the ability to limit fret ranges and strings as well as a "smart" system where it revisits notes you got wrong more frequently which would make this 5 star. A note on the music staff option would really make it the best app out there. I long for the day Justin makes an app for guessing chords and scales!
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Guitar Fretboard Note Trainer