GUPTech FrAG Boost

The GUPtech FrAG Boost is a boost/preamp pedal designed to push the front end of your amp into sharp, cutting high-gain territory while keeping your tone tight and articulate. GUPtech calls it one of its most brutal and flexible boost/preamp pedals to date, and describes the result as rich harmonics, no more flubby low-end, and super sharp and crisp metal tones¹.

What it does to your sound

GUPtech positions the FrAG Boost as a tool for players who want more aggression from their amp rather than a standalone distortion. The maker says the pedal "gives you that presence and depth, like stacking two great boosts in one box"¹. Used in front of a driven amp, it is meant to tighten the low end and sharpen the attack, which is why GUPtech describes the outcome as "rich harmonic, no more flubby low-end, super sharp and crisp metal tones"¹.

The Glow in the Dark edition carries the same description, and GUPtech suggests using it "as a preamp boost to any high gain pedals or amps to kick your tones"². That makes it a front-of-amp boost in the same family as the GUPtech Slime Mid-Boost, the GUPtech Le Chiou EQ-Boost and the GUPtech Peeps Clean Boost, though the FrAG is the one aimed squarely at high-gain and metal players. For more on the category, see Boost Pedals.

Controls

The FrAG Boost keeps things simple with two knobs¹²:

The Volume knob sets how hard the pedal hits the amp's input, while the Drive knob lets you add grit within the pedal itself before the signal ever reaches the amp.

Power and bypass

The FrAG Boost runs on 9V DC center-negative power and takes no batteries¹. GUPtech lists the current draw at 3 mA¹, which is light enough for any output of a standard pedalboard power supply, including shared outputs. The pedal is true bypass, so it stays out of your signal path when switched off¹.

Editions and availability

GUPtech offers the FrAG Boost in Neon Yellow Gray and Neon Yellow color options¹. A limited Glow in the Dark edition was released in October 2026 with the same circuit as the original, hand-built in Saguenay, Quebec². There is also a Gold Tone Rush edition, which GUPtech describes as a Metal Boost; it was listed as sold out as of 26 October 2026³.

Where it comes from

GUPtech builds the FrAG Boost by hand in Saguenay, Québec, Canada, and the maker states that all of its pedals are made by the company there¹³. The Glow in the Dark edition page repeats the point: "Like all GUPTech gear, it's hand-built in Saguenay, Quebec"².

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