PolyChrome DSP is a UK-based developer of guitar-focused audio software plugins, founded by YouTube guitarist and educator Thomas McRocklin. The company builds amp and effects modeling plugins available in VST, AU, AAX, CLAP and standalone formats for Windows and macOS, with Apple Silicon native support and a focus on low-latency performance.

The lineup centers on the McRocklin Suite, an all-in-one guitar tone plugin bundling amp models (Acoustic, Clean, Edge, and Gain voicings), a set of gain pedals (Attacker, Shredder, Riffer, and Viber), EQs, compression, reverbs, delays, modulation, and hundreds of presets. Additional releases include Graphene and Nunchuck (amp plugins inspired by high-gain and JCM800-style tones), Lumos (a modulation- and pitch-oriented multi-effect), Cry Boy (a wah), and HyperTune (a pitch shifter/transposer), along with bundles such as the Ultimate Pitch Bundle and Heavy Elements Bundle.

PolyChrome DSP sits in the metal- and rock-leaning guitar plugin niche, targeting players who want a streamlined software rig rather than a deep amp-modeler ecosystem. The McRocklin branding ties the company closely to Thomas McRocklin's online presence and playing style, which has been covered in guitar press including Guitar World.

Polychrome DSP has 1 product cataloged on Equipboard, including Effects Processors. Their gear is featured by 1 artist, with the strongest followings in Rock, Classical, and Metal. Notable users include Edoardo Taddei.