The FrAG Boost Glow in the Dark Edition is a limited version of the FrAG Boost, a boost/preamp pedal from Canadian builder GUPtech. GUPtech describes the FrAG Boost as "one of our most brutal and flexible boost/preamps to date," aimed at players who want to push high gain pedals or amp front ends harder. The Glow in the Dark edition, released in October 2026, carries "exactly the same circuit as the original FRAG"; the difference is the finish, not the electronics1.
What it does
GUPtech positions the FrAG Boost as a preamp boost for high gain pedals and amps: "Use it as a preamp boost to any high gain pedals or amps to kick your tones." The maker's description of the result is "rich harmonic, no more flubby low-end, super sharp and crisp metal tones," which points at its intended home in metal and hard rock rigs1. It sits in the wider family of boost pedals, but with drive and tone-shaping controls it goes further than a straight clean boost.
Controls
| Control | What it does |
|---|---|
| Volume | A classic 0 to full-on boost to slam your amp front end |
| Drive | Adds crunch and grit, from clean grind into overdriven territory |
| Bright | Brings presence and slices through a muddy low end |
| 8-Mode selector | Sets the low-end cut across 8 different modes |
The 8-mode selector is the control that sets the FrAG Boost apart from a simple volume-pedal-style boost: it lets you decide how much low end is trimmed before the signal hits your amp or drive pedals, which is where the maker's "no more flubby low-end" claim comes from1.
Power and practical details
The pedal runs on 9V DC center-negative and takes no battery, with a current draw of 3 mA1. That draw is low enough for any standard power supply output or daisy chain. Bypass is true bypass, so the circuit is out of the signal path when the pedal is off1.
There is no battery option: plan on a 9V DC center-negative supply. This is a limited edition from October 2026, drawing only 3 mA.
Where it fits in GUPtech's range
The FrAG Boost Glow in the Dark Edition carries a list price of £88.00 GBP1. GUPtech describes the Drive knob as adding "a bit of crunch and grit, will get you from completely grind to overdriven territory," the Bright knob as bringing "presence and slice through the muddy low-end," and the 8-Mode selector as helping "you dictate the low-end cut with 8 different modes"1. The maker sums up the result as "rich harmonic, no more flubby low-end, super sharp and crisp metal tones"1.
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Questions
Is the Glow in the Dark edition the same circuit as the regular FrAG Boost?
Yes. GUPtech describes the Glow in the Dark edition as having exactly the same circuit as the original FRAG. The difference is the enclosure finish: this is a limited edition released in October 2026 with a glow in the dark look, while the circuit and controls carry over unchanged from the standard FrAG Boost.
Does the FrAG Boost take a battery?
No. GUPtech specifies 9V DC center-negative power with no batteries. The pedal draws 3 mA, which is light enough for almost any pedalboard power supply, but you will need a standard 9V DC center-negative adapter or output rather than relying on a battery.
Is the FrAG Boost true bypass?
Yes. GUPtech lists the FrAG Boost Glow in the Dark Edition as true bypass, so when the pedal is off your guitar's signal passes to the rest of the board without going through the boost circuit.
Where is the FrAG Boost made?
GUPtech builds the FrAG Boost by hand in Saguenay, Quebec, and lists it as handmade in Québec. It is a small-shop pedal rather than a mass-produced import.
Sources (1)
- FrAG Boost Pedal, GUPtech (guptech.ca), 2026-10
