Without further ado I present the Barkhausen Effects – Guitar Notes in Scale tool. It supports all of the common Western music modes (Ionian, Dorian, etc.) as well as pentatonic and blues scales, plus some less common scales such as the Algerian, Roumanian Minor, and my favourite (name-wise, anyway) the Enigmatic.
From the top left menus you select the Key and the desired Scale, and the fretboard will display the scale. You can also highlight a specific Interval of the root note, or simply highlight a specific Note (if the specified note is not in the currently displayed scale nothing will happen). The All and Reset buttons are hopefully self-explanatory.
I hope you find the Guitar Notes in Scale tool helpful. If there’s a scale missing that you’d like to see included, drop me a line at barkhausen [at] barkhausen.nz.