Inertia Sound Systems is an audio software company based in Athens, Greece that develops creative effect plugins and instruments for music production. The team's stated aim is to build tools that inject personality and character into a producer's signal chain, drawing on backgrounds that span musical and speech processing, DSP work for the medical sector, embedded design, web software, and satellite automation systems.

The company's catalog centers on a small set of focused plugins available in VST, VST3, and Audio Unit formats for macOS, Windows, and Linux. Releases include Instinct, billed as a combined drive, dynamics, and tone processor; Hinder, a vintage lo-fi delay; and Granulizer 2, a granular synthesis tool aimed at sound design. The plugins are also bundled together as the Inertia Bundle.

Inertia's design philosophy favors simple interfaces with wide expressive range over feature-heavy designs, and the company markets primarily to producers and sound designers looking for unconventional textures rather than transparent utility processing. Their plugins are distributed through their own store and through retailers such as Plugin Boutique.

Inertia Sound Systems has 4 products cataloged on Equipboard, including Delay Plugins, Distortion Plugins, and FX Bundle Plugins.