SonicXTC is a small VST plugin developer based in the San Francisco Bay Area of California. The studio focuses on Windows-only audio plugins for music producers, with a catalog that mixes free downloads and commercial titles built around vintage hardware emulations and electronic-music workflows.

Its catalog leans heavily into acid, techno, and lo-fi production tools. The B-Line 303 is a monophonic dual-oscillator bass synth modeled on classic acid-house gear, while Acid Zone Retro and Deep Step-606 cover similar ground with simplified single-oscillator and step-sequenced takes. On the effects side, Echoflux recreates 1960s/70s tube and transistor tape echoes, Filta Crunch pairs a Moog-style ladder filter with a Silvertone-inspired tube drive, Liquid Verb handles reverb duties, and Ring Modulator 101 stacks a transistor ring mod with a tube amp, tube echo, ladder filter, and chorus/flanger in a single signal chain. Other releases include Beat Twist, Fusion Delay, and Tonic Juice.

The developer's stated philosophy is to release affordable, narrowly focused plugins that emulate specific vintage circuits rather than broad multi-effect suites, and many of its instruments and effects are distributed free to the bedroom-producer community through plugin aggregators like KVR Audio and Plugin Boutique.

SonicXTC has 9 products cataloged on Equipboard, including Synth Plugins, Drum Machine, and Sampler Plugins. Their gear is featured by 1 artist, with the strongest followings in Electronic. Notable users include TehCarterPSpartan.