Alternatives to the MXR M103 Blue Box

Catalinbread Perseus

Shared character: each note, mono synth, tight tracking

Electronic Audio Experiments Eldritch Blast V3

Shared character: mono synth, one octave

EarthQuaker Devices Data Corrupter

Shared character: each note, mono synth, tight tracking

Fender Kevin Shields Blender

Shared character: one octave, simple, full

JHS Pedals JHS Coyote

Shared character: two octave down effect, tonal possibilities, one octave

Fairfield Circuitry The Unpleasant Surprise

Shared character: mono synth, fat, one octave

Boss FZ-5 Fuzz

Shared character: fat, one octave

Pigtronix OCT2

Shared character: tight tracking, one octave

JAM Pedals Octaurus

Shared character: two octave down effect, mono synth, one octave

Dunlop MXR SUB Machine

Shared character: mono synth, tight tracking, one octave

Fender Blender

Shared character: raw, tight tracking, one octave

Dunlop JHMS2 Hendrix Shrine Series Octavio Fuzz

Shared character: each note, one octave, lead

Fulltone OF-1 Octafuzz

Shared character: each note, mono synth, one octave

JAM Pedals Eureka! Fuzz v2

Shared character: two octave down effect, mono synth, one octave

Beetronics OC-BS

Shared character: one octave, lead

JHS Pedals JHS Coyote Octave Moonrock

Shared character: one octave, thickness

Zvex Vexter Series Fuzz Factory

Shared character: users, mono synth, thickness

Tone City Fuxx Fuzz TC-T10

Shared character: two octave down effect, one octave, distortion

Electronic Audio Experiments Eldritch Blast V2

Shared character: one octave

Voodoo Lab Proctavia

Shared character: durable construction, one octave, thickness

T-Rex Octavius

Shared character: each note, tight tracking, one octave

Univox Super-Fuzz

Shared character: each note, fat, raw

Fulltone OF-2 Octafuzz

Shared character: solo, one octave

Keeley KE-Octap

Shared character: mono synth, one octave