Paradox Effects is a boutique effect pedal maker based in Tijuana, Baja California, Mexico, founded in 2013 by electrical engineer Efren Castro and visual artist Fernando Servín. The company builds its pedals by hand and is known for pairing experimental circuit design with bold, colorful enclosure artwork that reflects its co-founders' mix of engineering and visual-arts backgrounds.

The lineup spans reverb, delay, modulation, and drive categories, with releases including the Vitral microtonal shimmer reverb, the Arquitecto cascading modulated reverb, the Habla-Bla polyrhythmic delay with variable sample rate, the Futura analog chorus/vibrato, and the Carmesí four- or eight-stage phaser. The designs tend to go beyond standard stompbox formats, offering multi-voice routing, microtonal intervals, and deep modulation options aimed at sound designers and experimental players.

The brand has drawn attention from outlets such as Premier Guitar, Guitar World, and Delicious Audio, and its pedals have reached a range of international players and producers. Paradox frames the pedal not only as a utility for music production but as a cultural object and a sonic language, an ethos reflected in both the circuits and the artwork on each unit.

Paradox Effects has 8 products cataloged on Equipboard, including Harmonizer & Octave Effects Pedals, Reverb Effects Pedals, and Overdrive Effects Pedals. Their gear is featured by 3 artists, with the strongest followings in Rock. Notable users include Chetes, Noel Gallagher, and James Edward Bagshaw.