Alternatives to the Electro-Harmonix Slammi Plus

Boss PS-5 Super Shifter

Shared character: pitch modulation, whammy, expression pedal

Donner Harmonic Square Octave/Pitch Shifter

similar tone character

DigiTech WH-1 Whammy Pedal

Shared character: whammy, expression pedal, tight tracking

Electro-Harmonix Pitch Fork Plus

Shared character: pitch modulation, tight tracking, one octave

Boss X-100 Poly Shifter

Shared character: whammy, expression pedal, one octave

Boss XS 100 Poly Shifter

Shared character: whammy, expression pedal, one octave

Electro-Harmonix Pico Pitch Fork

Shared character: pitch modulation, tight tracking, one octave

DigiTech Whammy DT

Shared character: whammy, pitch modulation, expression pedal

TC Electronic Pitchfork

Shared character: pitch modulation, one octave

Electro-Harmonix Intelligent Harmony Machine

Shared character: pitch modulation, tight tracking, one octave

Meris Hedra Shifter

Shared character: pitch modulation, tight tracking

EarthQuaker Devices Rainbow Machine

Shared character: pitch modulation, tight tracking, one octave

Digitech Whammy 5

Shared character: whammy, expression pedal, one octave

Eventide PitchFactor

Shared character: expression pedal, lead

Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter

Shared character: pitch modulation, whammy, expression pedal

Boss PS-6

Shared character: pitch modulation, expression pedal, tight tracking

Meris MR Hedra

Shared character: pitch modulation, whammy, mono synth

EVH Pitch Fork

Shared character: expression pedal, tight tracking, one octave

Hotone Skyline Harmony Pitch Shifter/Harmonist

Shared character: pitch modulation, tight tracking

DigiTech Whammy MN Mono Neon

Shared character: pitch modulation, whammy, expression pedal

Boss MO-2

similar tone character

Red Panda Tensor

similar tone character

Mooer Polyphonic

similar tone character

Meris Enzo

similar tone character