Sonic Anomaly is a Finnish freeware audio plugin project, started by a developer using the handle Stige. Its plugins began life as JSFX scripts for Cockos Reaper before being ported to VST format for Windows DAWs, and the original JSFX versions remain hosted on GitHub for use in Reaper or via the ReaJS wrapper.

The catalog focuses on mixing and mastering tools, including the Unlimited mastering limiter (a stereo and 5.1-capable maximizer with RMS metering and an ITU-R BS.1770 loudness meter), the Transpire transient shaper, the Bass Professor and Bass Professor MK2 low-end enhancers, the HBC bus compressors, QuadraCom multiband processor, SLAX vintage-style compressor, SEGX2 dual-band expander/gate, Leet Delay, TriLeveler 2 broadcast leveler, and the Skope2 metering plugin.

Sonic Anomaly built a following in the bedroom-producer and Reaper communities, where the plugins are commonly recommended on forums such as KVR Audio and Bedroom Producers Blog as polished, no-cost alternatives to commercial mixing tools.

Sonic Anomaly has 2 products cataloged on Equipboard, including Limiter Plugins and Transient Shaper Plugins.