Guitar Notes Master is a fretboard tutor app designed by Pett Software Limited for Android users who want to improve their guitar playing skills. The app maximizes practice time by teaching the fundamentals of guitar fretboard theory, including note positions, intervals, chords, scales, and arpeggios. It also includes lessons that cover the spectrum of fretboard knowledge, from the basics of open strings to complex chords, modes, and advanced scales. Guitar Notes Master is suitable for both beginners and experienced guitarists and makes a great companion to formal lessons with a teacher or other learning resources.

The app has a Practice screen that generates thousands of practice questions to test knowledge and burn the fretboard theory into the user's mind. Unlike other fretboard training applications, these exercises are structured to reinforce the lesson content and build fretboard knowledge logically. The Virtual Fretboard allows users to focus on fretboard theory in isolation, without the distractions of technique, rhythm, and tone issues that may arise with a physical guitar. With the practice taking place on the Virtual Fretboard, users can practice at any time, even when they can't play their guitar. Guitar Notes Master encourages users to practice little and often, maximizing their practice time and seeing their playing ability improve rapidly.