Fretboard Geek, LLC is a web application and e-commerce site for learning the fretboard on various instruments, including guitar, bass, violin and mandolin. The Geek App has over a dozen online drills to help learn about notes, intervals, chords and scales on the user's chosen instrument. The site is also host to an e-commerce store with world-class guitar cheat sheets that reference chords, scales and jazz-related theory. It also has various clothing and other items for fretboard geeks.