OXI Instruments is a Spanish music technology company founded by engineer Manuel Vázquez, who developed the company's first product single-handedly before building it into a small team operation. The brand designs sequencers, controllers, and Eurorack modules aimed at hardware-focused producers, modular users, and live performers, with everything shipped from Spain.

The lineup is anchored by the OXI ONE (and its successor, the OXI ONE MKII), a deep MIDI/CV sequencer and controller built around a grid of pads and per-track sequencing tools. Other releases include the OXI Coral, a 14HP polyphonic, multi-engine, multi-timbral Eurorack voice with engines spanning virtual analog, FM, wavetable, supersaw, string, drum, and sample playback; the OXI E16, a MIDI controller with motorized or visual feedback per encoder; and the OXI Meta-FX performance effects module. Smaller utilities such as Split and Pipe round out the catalog as expanders and connectivity tools.

Within the modular and hardware sequencing community, OXI is generally discussed as a boutique builder offering feature-dense alternatives to more established names — Coral is frequently compared to Mutable Instruments' Plaits, and the OXI ONE is often positioned alongside sequencers like the Polyend Tracker, Squarp Pyramid, and Torso T-1. The company maintains an active firmware development cycle and engages users via a Discord community for feature requests and beta testing.

OXI Instruments has 2 products cataloged on Equipboard, including Synthesizers and MIDI Interfaces. Their gear is featured by 2 artists, with the strongest followings in Electronic and Hip Hop. Notable users include A Thousand Details and C.H.A.Y..