BFFX is a Brazilian boutique effects pedal builder based in Ribeirão Preto, São Paulo, handcrafting a range of guitar effects with an emphasis on quality components and distinct circuit designs. Their catalog spans overdrive, reverb, delay, and utility effects, including the Demon D overdrive, Kairen overdrive (which packages three variations of the Klon circuit in a single enclosure), Sublime overdrive, Lightyear reverb, Dual Time delay, and the Guitarlab1 — a combined booster, overdrive, and distortion in one unit.

The brand has built a following within Brazil's boutique pedal community and gained wider international visibility through platforms like Reverb and coverage by enthusiast blogs covering South American gear builders. Their pedals are sold directly through their online store at bffx.com.br as well as through Brazilian retailers, with prices placing them in the premium boutique segment.

BFFX has 6 products cataloged on Equipboard, including Overdrive Effects Pedals, Delay Effects Pedals, and Reverb Effects Pedals.