Sound Particles is a 3D audio software company based in Leiria, Portugal, founded in 2016 by Nuno Fonseca. The company applies concepts from computer graphics — particle systems — to sound design, allowing users to place, move and multiply thousands of sounds inside a virtual 3D space. Its tools target film post-production, video game audio, virtual reality and immersive music production, with native support for spatial formats including Dolby Atmos and object-based ADM workflows.

The flagship application, Sound Particles, is a 3D audio editor used to generate complex moving soundscapes and pass-bys. Alongside the core app, the company develops a line of effects plugins, including Doppler (a physically modeled simulation of pitch, level and EQ changes for sounds passing the listener), Air (an air-absorption and distance modeler) and Density (a granular-style layering tool). Its software has been used in productions such as Dune, Oppenheimer, Frozen II, Game of Thrones, House of the Dragon and Stranger Things, and the company has been recognized by the Cinema Audio Society and the Academy of Motion Picture Arts and Sciences for its contributions to sound design.

Sound Particles has 27 products cataloged on Equipboard, including Synth Plugins, Stereo Width Plugins, and FX Bundle Plugins. Sound Particles's catalog spans the full price spectrum — from entry-level options to high-end flagships.