Guitar Scientist: The Most Powerful Guitar Diagrams Editor Online

Tools panel

Select the root note on a fretboard

Click on the 'root selector' icon, then click on any fret on any keyboard. When you select a root note all the degree numbers will reflect your selection and will be computed relatively to the root note.

Scales generator

The scale generator will always generate a scale on the root note of a fretboard and so it relies on this feature to generate scales in different roots.