HY-Plugins is a Japanese audio software developer based in Anjo, Aichi, run by a developer who goes by the handle Hyakken. The operation began in the Max for Live ecosystem before expanding into VST, VST3, and Audio Unit formats for Windows, Mac, and Linux, and has built a reputation for affordable, workflow-focused tools aimed at producers and sound designers.

The catalog centers on MIDI sequencers, virtual instruments, and creative effects. Notable releases include the HY-POLY subtractive polysynth, the HY-MPS3 block-based step sequencer, the HY-SEQ32 multi-lane sequencer, the HY-RPE2 Euclidean sequencer, HY-Slicer2, the HY-Delay4 delay, the HY-Filter4 modulation filter, the HY-MBMFX3 multiband effects processor, HY-Lofi2, and the HY-TP2 tremolo/pan utility.

A defining trait of the brand is that most paid plugins ship alongside feature-rich free versions, which has given HY-Plugins a strong following among bedroom producers and experimental electronic musicians on forums such as KVR Audio.

HY-Plugins has 14 products cataloged on Equipboard, including FX Bundle Plugins, Sequencer Plugins, and Sampler Plugins. Their gear is featured by 1 artist, with the strongest followings in Electronic. Notable users include Tom Hades.