Alternatives to the Mad Professor 1 Overdrive

Horizon Devices Precision Drive

Shared character: bright, digital, pedal

Amptweaker AT Fatrock

Shared character: bright, reverb, hard_rock

NuX NDS-5 Fireman Distortion Dual Brown Sound

Shared character: brown_sound, presence, hard_rock

MXR M104 Distortion+

Shared character: bright, hard_rock, pedal

Source Audio Soundblox Multiwave Distortion

Shared character: digital, pedal, clarity

Friedman BE-OD Deluxe

Shared character: presence, hard_rock, pedal

Abasi Pathos Distortion

Shared character: presence, digital, pedal

Maxon OD808

Shared character: hard_rock, pedal, response

Friedman Box of Doom Distortion

Shared character: brown_sound, hard_rock, overdrive

Dean Markley Overlord

similar tone character

Behringer Fuzz Bender

similar tone character

Catalinbread Sabbra Cadabra Blackout

similar tone character

Dunlop JDF2 Fuzz Face

similar tone character

Dunlop MXR M78 Custom Modified OD, also known as the Bad Ass Modified OD

similar tone character

Way Huge Pork Loin

similar tone character

Demon FX Gladiator

similar tone character

Rainger FX Break Box

similar tone character

Boss DS-1 Distortion

similar tone character

Boss DS-2 Turbo Distortion

similar tone character

Boss HM-2 Heavy Metal

similar tone character

Boss MT-2w

similar tone character

ProCo RAT 2

similar tone character

Boss OS-2 OverDrive/Distortion

similar tone character

JHS Morning Glory

similar tone character