HexeFX is a small electronics outfit founded by Piotr Zapart, a Polish engineer and guitarist whose work centers on experimental and unconventional effects. The name comes from the German word for "witch," a nod to regional folklore and to the digital, hexadecimal-flavored nature of much of the company's work. Operated as essentially a one-person project, HexeFX designs and builds pedals in small batches.

The brand is best known for the reVOLVER series — a line of micro looper, glitch, and stutter pedals that capture short audio fragments and play them back in randomized or rhythmic patterns. The catalog also includes the Melusine modulation pedal, the BongFuzz doom fuzz with built-in modulation, the No7 Splitter, and the Sound Cartridge. Alongside the production line, HexeFX runs a "Lab" branch for experimental one-offs and a "Museum" archive of discontinued designs.

A significant portion of the company's R&D leans on the Teensy 4 platform and is released as open-source hardware and firmware. Projects in this vein include the T-CAB stereo IR cabinet emulator with reverb, and the TGX4, a guitar rig emulator that incorporates neural-network-based amp modeling. Schematics, code, and DIY resources are shared publicly through the brand's GitHub presence under hexeguitar.

Hexe has 6 products cataloged on Equipboard, including Multi Effects Pedals, Looper Effects Pedals, and Reverb Effects Pedals. Their gear is featured by 14 artists, with the strongest followings in Rock, Electronic, and Pop. Notable users include Merzbow, David Torn, and George Pajon, Jr..