U&I Software is a macOS-only developer of creative audio and visual software, founded in 1997 by Eric Wenger — the French programmer, musician, and graphic designer previously known for creating the 3D landscape tool Bryce. The company's flagship product, MetaSynth, is a sound design and electronic music environment built around a distinctive image-synthesis approach, where graphics in the Image Synth room are translated into audio. The suite is organized into multiple "rooms" covering synthesis, filtering, sequencing, effects, and mixing, and ships with a companion MIDI sequencer called Xx that uses MetaSynth as its sound engine.

Alongside MetaSynth, U&I Software publishes ArtMatic, a procedural tool for generating abstract images, 3D worlds, and sound, and ArtMixer, a vector-based image composition tool. The company's output sits in a niche between audio, visual art, and generative design, and is aimed at sound designers, film composers, and experimental electronic musicians rather than mainstream music production.

MetaSynth has been used in the sound design of films including The Matrix, Inception, The Dark Knight, Black Hawk Down, and Dune (2021), and has been cited in work by artists such as Aphex Twin — who famously encoded an image into the track "Formula" from the Windowlicker EP — as well as Junkie XL and VNV Nation.

U&I Software has 1 product cataloged on Equipboard, including Virtual Instrument. Their gear is featured by 7 artists, with the strongest followings in Electronic, Folk, World, & Country, and Classical. Notable users include Aphex Twin, clipping., and Biosphere.