Let's Fret Master is an unique guitar practice app that has several features to help you memorizing the position and the note of the guitar fretboard.
The training mode is designed so that you will be able to learn over and over, fret by fret. The training result will be stored automatically and you can see your progress with a chart. Also, the result will show you the score for each position of a fret, so you will see which fret and position you need more practice.
In the normal mode, you can test which positions of the guitar fretboard are corresponding to the piano key. You can also check the other way around. Tapping a piano key will show you which frets and positions makes the same note as the selected piano key.
The training mode has no fixed training time or goal, so you can play anytime and any duration you want. Play it 5 minutes a day for two weeks and you will feel the difference!