The ProCo Fat Rat is a Proco fuzz pedal, currently around $169.99. Close alternatives include the Pigtronix Fat Drive and the MXR M115 Distortion III. It pairs well with the Mesa Boogie Mark I and the Synergy SL2 Module.

ProCo Fat Rat

Proco · pedal

The ProCo Fat Rat is an enhanced version of the classic ProCo Rat, adding switchable clipping between silicon (the classic Rat voice) and MOSFET/germanium options, with the MOSFET setting smoothing and subtly scooping the upper mids for a more amp-like, natural character. It delivers depth and character reminiscent of a nice tape machine, with a tone that can be both heavy and soft, crunchy without masking tube warmth or single-coil pickup character. Reviewers praise it as a killer-sounding pedal with a ton of distortion that still retains clarity, particularly excelling on heavy, down-tuned riffs where it outperforms a basic Rat 2. It suits players wanting the classic Rat foundation with real added tonal flexibility from silicon-to-MOSFET clipping options, spanning blues to metal.

  • metal
  • fat
  • distortion
  • blues
  • solid
  • classic character
  • mids
  • clipping
$169.99View on Reverb

Price updated Aug 26, 2026

Genres the ProCo Fat Rat is commonly used in

  • Rock
  • Blues
  • Metal
  • Hard Rock
    citedInferred from shared tonal signals, not a stated genre tag.
  • Heavy Metal
    citedInferred from shared tonal signals, not a stated genre tag.
  • Alternative
    citedInferred from shared tonal signals, not a stated genre tag.

Amps that pair well with the ProCo Fat Rat

Mesa Boogie Mark I

Mesa Boogie

25% match
$1494.37via Reverb

Mesa Boogie Mark I takes that crunchy character and pushes it toward mid-forward

Synergy SL2 Module

Synergy

tonal match

Synergy SL2 Module stacks high gain on top of the mid-forward already here

Ceriatone HRM 50

Ceriatone

tonal match

Ceriatone HRM 50 takes that crunchy character and pushes it toward mid-forward

Friedman Jose Arredondo

Friedman

tonal match

Friedman Jose Arredondo pushes a crunchy tone toward mid-forward

Ceriatone Overtone Special HRM Bluesmaster 50

Ceriatone

tonal match

Ceriatone Overtone Special HRM Bluesmaster 50 pushes a crunchy tone toward mid-forward

Ceriatone 2202H

Ceriatone

tonal match

Ceriatone 2202H stacks high gain on top of the mid-forward already here

Friedman Jose LTD

Friedman

tonal match

Friedman Jose LTD layers high gain onto an already mid-forward signal

Friedman BE-Mini Head

Friedman

tonal match
$203.48via Reverb

Friedman BE-Mini Head stacks high gain on top of the mid-forward already here

Pedals that stack with the ProCo Fat Rat

Carl Martin Hot Drive'n Boost MK3

Carl Martin

26% match

Put Carl Martin Hot Drive'n Boost MK3 in front and the mid-forward tone leans further toward high gain

JHS Smiley

JHS Pedals

26% match

JHS Smiley layers fuzzy onto an already mid-forward signal

Wampler Cory Wong

Wampler

18% match
$269.97via Reverb

What Wampler Cory Wong brings here leans toward clean boost — that's worth building a pairing around

Caroline Guitar Company Parabola State Tremolo

Caroline Guitar Company

15% match
$219via Reverb

Run Caroline Guitar Company Parabola State Tremolo after ProCo Fat Rat in the signal chain, clear of ProCo Fat Rat's own gain stage

Catalinbread Epoch-Set

Catalinbread

11% match
$226.26via Reverb

Catalinbread Epoch-Set's warm voice goes after ProCo Fat Rat in the signal chain — it's not there to compete with ProCo Fat Rat's own full character — goes in the amp's FX loop (or last, into a clean amp)

Boss RV-5 Digital Reverb

pedal

8% match
$79.99via Reverb

Boss RV-5 Digital Reverb's spring voice goes after ProCo Fat Rat in the signal chain — it's not there to compete with ProCo Fat Rat's own full character — goes in the amp's FX loop (or last, into a clean amp)

J. Rockett The Dude V2

J Rockett

tonal match
$183.99via Reverb

J. Rockett The Dude V2 is voiced for a clean amp's front end — ProCo Fat Rat gives it exactly that

Suhr Eclipse

Suhr

tonal match

Suhr Eclipse's own voicing points at a clean amp's front end, and ProCo Fat Rat delivers it

Cheaper alternatives

ProCo RAT 2

Proco

70% similarity
$88via Reverb

“particularly excelling on heavy, down-tuned riffs where it outperforms a basic Rat 2”

Orange Coat Fuzz

Orange

69% similarity
$133.84via Reverb

Shared character: s_build_quality, blues_players

Maxon OD808

Maxon

69% similarity
$118.63via Reverb

Shared character: blues_players, distortion, metal

DOD Carcosa

Digitech

68% similarity
$123.72via Reverb

Shared character: blues_players, fat, distortion

TC Electronic Eyemaster

TC Electronic

68% similarity
$52.18via Reverb

Shared character: distortion, s_build_quality, metal

Sonicake MiniLane Shark Classic Crunch Distortion

Sonicake

64% similarity
$43.98via Reverb

Shared character: distortion, metal

Boutique & premium upgrades

Menatone None More Black

Menatone

69% similarity
$249via Reverb

Shared character: fat, distortion, s_build_quality

JAM Pedals Fuzz Phrase Si Silicon Fuzz

Jam Pedals

94% similarity
$225via Reverb

similar tone character

Fairfield Circuitry 900 Fuzz

Fairfield Circuitry

94% similarity
$232.07via Reverb

similar tone character

Dallas Rangemaster Treble Booster

Dallas

94% similarity
$3558.02via Reverb

similar tone character

Blackstar HT-Metal

Blackstar

93% similarity
$267.69via Reverb

similar tone character

Similar charactersee all similar tone character →

Pigtronix Fat Drive

Pigtronix

71% similarity
$212.30via Reverb

Shared character: fat, s_build_quality, blues_players

MXR M115 Distortion III

MXR

71% similarity

Shared character: distortion, s_build_quality, metal

T-Rex Fat Shuga

T Rex

70% similarity

Shared character: fat, s_build_quality, blues_players

Univox UD-50 Uni-Drive

pedal

68% similarity

Shared character: blues_players, distortion, metal

Fulltone OCD

Fulltone

68% similarity

Shared character: blues_players, fat

Suhr Riot Mini Black Edition

Suhr

68% similarity

Shared character: distortion, s_build_quality, metal

See all alternatives to the ProCo Fat Rat (cheaper + boutique) →

Questions people ask

What are good alternatives to the ProCo Fat Rat?+

The closest matches in character are the Pigtronix Fat Drive, the MXR M115 Distortion III, the T-Rex Fat Shuga. Budget picks: ProCo RAT 2, Orange Coat Fuzz, Maxon OD808. Boutique upgrades: Menatone None More Black, JAM Pedals Fuzz Phrase Si Silicon Fuzz, Fairfield Circuitry 900 Fuzz.

What pairs well with the ProCo Fat Rat?+

Strong matches from rig and tone-complementarity evidence: Mesa Boogie Mark I, Synergy SL2 Module, Ceriatone HRM 50 — Mesa Boogie Mark I takes that crunchy character and pushes it toward mid-forward.

How much does the ProCo Fat Rat cost?+

Around $169.99 (live listing price, updated Aug 26, 2026).

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