ZL Audio is an independent developer of free, open-source audio plugins created by zsliu98. The project distributes its software under the AGPL-3.0 license and makes builds available in VST3, AU, AAX, and LV2 formats for macOS, Windows, and Linux.

The catalog focuses on mixing and mastering tools, including ZL Equalizer, a dynamic digital equalizer; ZL Compressor, a dynamic range processor; and ZL Splitter, a multi-mode signal splitting utility. A companion ZL Spectrum Equalizer and several developer resources — including a plugin template and a fork of the JUCE framework — are also maintained under the ZL Audio umbrella on GitHub.

Development is carried out publicly on GitHub, where users can report issues, browse source code, and contribute. The plugins have drawn a following in the home-recording and open-source audio community for offering modern dynamic EQ and processing features at no cost.

ZL Audio has 1 product cataloged on Equipboard, including EQ Plugins.