The Keeley Octa Psi is a Keeley fuzz pedal, currently around $249. Close alternatives include the Keeley KE-Octap and the Keeley octa osi transfigurating fuzz. It pairs well with the Swart Space Tone Atomic Jr. Two-Tone and the Traynor YCV40 Custom Valve Combo.
Keeley Octa Psi
Keeley · pedal
The Keeley Octa Psi is an octave fuzz pedal from Keeley Electronics delivering upper and lower octave fuzz saturation with a psychedelic, synth-like character suited to experimental and psychedelic rock. The circuit produces harmonically layered saturation with octave overtones that add otherworldly quality to guitar tones. Used for experimental, psych rock, and progressive guitar applications.
What stands out
“Most effective on single-note lines on the neck pickup where octave definition is clearest”
— from the community notes
“The Keeley Octa Psi is an octave fuzz pedal from Keeley Electronics delivering upper and lower octave fuzz saturation with a psychedelic, synth-like character suited to experimental and psychedelic rock”
— from the listing
“The Octa Psi delivers complex octave fuzz with synth-like harmonic layering from Keeley's American production standard”
— from the reviews
“keeley american construction is reliable”
— from the community notes
“Keeley's dedicated octave fuzz offering, providing psychedelic harmonically layered fuzz with octave content”
— from the community notes
- octave
- psychedelic
- experimental
- octave fuzz
- synth
- rock
- complex
- definition
Price updated Oct 24, 2026
Genres the Keeley Octa Psi is commonly used in
- Electronic
- Experimental
- Rock
- Psychedelic Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Noise Rock
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Keeley Octa Psi
Swart Space Tone Atomic Jr. Two-Tone
Swart
11% matchSwart Space Tone Atomic Jr. Two-Tone leans toward lush, and that's a real, usable character to pair with
Comes later in the signal chain
Traynor YCV40 Custom Valve Combo
Traynor
11% matchTraynor YCV40 Custom Valve Combo's own spring character is the real reason this is worth trying
Comes later in the signal chain
Pedals that stack with the Keeley Octa Psi
Suhr Rufus Reloaded
Suhr
8% matchSuhr Rufus Reloaded's own fuzzy character is the real reason this is worth trying
ThorpyFX The Dane
ThorpyFX
8% matchThorpyFX The Dane leans toward fuzzy, and that's a real, usable character to pair with
Comes earlier in the signal chain
Electro-Harmonix Electric Mistress
Electro-Harmonix
7% matchKeep Electro-Harmonix Electric Mistress after Keeley Octa Psi in the signal chain, clear of Keeley Octa Psi's own gain stage
Comes later in the signal chain
Ashdown Macchiato Compressor Guy Pratt Signature
Ashdown
6% matchAshdown Macchiato Compressor Guy Pratt Signature leans toward compressed, and that's a real, usable character to pair with
Comes earlier in the signal chain
Old Blood Noise Endeavors Dark Star V3
Old Blood Noise Endeavors
5% matchRun Old Blood Noise Endeavors Dark Star V3 after Keeley Octa Psi in the signal chain, clear of Keeley Octa Psi's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Source Audio Nemesis
Source Audio
5% matchSource Audio Nemesis's pristine voice goes after Keeley Octa Psi in the signal chain — it's not there to compete with Keeley Octa Psi's own octave character — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Cheaper alternatives
Catalinbread Octapussy
Catalinbread
56% similarityShared character: mono synth, one octave, circuit
Dunlop MXR Octavio Fuzz JD-M267
Dunlop
54% similarityShared character: one octave, circuit
EarthQuaker Devices Bit Commander
EarthQuaker Devices
51% similarityShared character: mono synth, one octave, circuit
EarthQuaker Devices Fuzz Master General V2
EarthQuaker Devices
51% similarityShared character: neck pickup, one octave
Tru-Fi Octavia Fuzz
Tru Fi
48% similarityShared character: one octave
EarthQuaker Devices Eqd-Bit
EarthQuaker Devices
94% similaritysimilar tone character
Boutique & premium upgrades
Similar charactersee all similar tone character →
Keeley KE-Octap
Keeley
81% similarityShared character: neck pickup, mono synth, definition
Keeley octa osi transfigurating fuzz
Keeley
69% similarityShared character: mono synth, definition, one octave
Death By Audio Octave Clang
Death By Audio
57% similarityShared character: one octave, circuit
T-Rex Octavius
T Rex
55% similarityShared character: one octave
JAM Pedals Octaurus
Jam Pedals
54% similarityShared character: mono synth, one octave
Beetronics OC-BS
Beetronics
53% similarityShared character: one octave
See all alternatives to the Keeley Octa Psi (cheaper + boutique) →
Questions people ask
What are good alternatives to the Keeley Octa Psi?+
The closest matches in character are the Keeley KE-Octap, the Keeley octa osi transfigurating fuzz, the Death By Audio Octave Clang. Budget picks: Catalinbread Octapussy, Dunlop MXR Octavio Fuzz JD-M267, EarthQuaker Devices Bit Commander. Boutique upgrades: Fulltone OF-1 Octafuzz, Zvex Octane 3.
What pairs well with the Keeley Octa Psi?+
Strong matches from rig and tone-complementarity evidence: Swart Space Tone Atomic Jr. Two-Tone, Traynor YCV40 Custom Valve Combo, Suhr Rufus Reloaded — Swart Space Tone Atomic Jr. Two-Tone leans toward lush, and that's a real, usable character to pair with.
How much does the Keeley Octa Psi cost?+
Around $249 (live listing price, updated Oct 24, 2026).
Compare
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