OXI Instruments is a Spanish music technology company based in Nigrán, Spain, founded by engineer Manuel Vázquez. What began as a personal project called Melomaker grew into a full brand after Vázquez left his job in an unrelated industry to dedicate himself to building prototypes and defining the company's vision. OXI Instruments designs premium hardware aimed at electronic musicians, producers, and modular synth users.

The company's flagship product is the OXI One, a standalone polyphonic sequencer and MIDI controller capable of driving DAWs, MIDI gear, and modular rigs, with multiple sequencer modes, randomization, and probability features. The lineup also includes the OXI One MKII, which expands sequencing across 8 parts and up to 64 tracks with generative features and a larger OLED display; the OXI Coral, an 8-voice multi-engine polyphonic Eurorack module in 14HP offering virtual analog, FM, wavetable, waveshaping, string, sample playback, and drum engines along with built-in reverb, delay, and chorus; and the OXI E16, a compact MIDI controller with 16 LED-ring encoders in an aluminum unibody.

OXI's tools are known among hardware sequencing and Eurorack enthusiasts for packing deep feature sets into relatively compact, road-ready form factors, and the brand has built a following on forums like MOD WIGGLER and in coverage from Sound on Sound and gearnews.com.

Ox Instruments has 3 products cataloged on Equipboard, including Production & Groove, Modular Synthesizers, and Synthesizers. Their gear is featured by 3 artists, with the strongest followings in Electronic. Notable users include Rival Consoles, Kerrie, and A Thousand Details.