Peace Equalizer is a free, open-source graphical interface for Equalizer APO that turns Windows system-wide audio control into simple sliders and presets. Windows does not include a proper system-wide equalizer. Equalizer APO works as the audio engine underneath Windows, and Peace Equalizer gives it a friendly interface, so you can adjust sound for every app on your PC, including Spotify, YouTube, games, and video calls, from one place. With Peace Equalizer you can use up to 31 gain sliders per channel, adjust frequency, gain, and Q, switch between graphic and parametric views, save headphone presets, use a pre-amplifier to prevent clipping, and apply effects such as balance, crossfeed, and delay. It also supports AutoEQ headphone profiles. To use it, install Equalizer APO first, then install Peace Equalizer. It works on Windows Vista through Windows 11 and is free with no paid tier. Learn more about Peace Equalizer on the official site.