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'''A Harmony (or ''Intelligent'') pitch shifter shifts the frequency by an interval of an ''unspecified'' quality (2nd, 3rd, 4th, etc.). It detects the pitch of the note being played and uses the corresponding interval in the scale selected'''. For instance, if you use the scale of C Major with a shift of a 3rd and play a C note, the shifter would output an E, a M3 above C. However, if you played an A, it would output a C which is only a m3 above A. Advanced intelligent shifters allow various scales beyond all the Major and Natural Minor scales, such as Harmonic Minor (and some even allow you to program your own custom scales, including using tunings outside of equal temperament).
Additionally, there are devices that are not dedicated pitch shifters, but make use of pitch shifting, such as '''octavers ''' and some kinds of reverb/delay.
While uncommon to guitar, ''auto-tuners'' or ''pitch correctors'' are also pitch shifters that detect the pitch of an input and shift it to match the pitch of the closest note within a given scale. I will not cover them here.