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Equalizer APO vs MathAudio Headphone EQ: catalog facts
Equalizer APO	MathAudio Headphone EQ
Free Free and open source under the GPL, distributed through SourceForge.	Freemium Free as a foobar2000 component; VST, AU and CLAP plugin editions are paid.
Windows	Windows, macOS
Works at the system level, so every application on a device is equalised Parametric and graphic filters, with no practical limit on bands	Free foobar2000 component lowers the barrier to entry Includes a built-in test generator for measuring headphones
Applications using ASIO or WASAPI exclusive mode bypass it entirely The native interface is a text configuration file; sliders need the separate Peace front end	Full plugin format support requires paying for the VST/AU/CLAP edition Windows and Mac only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.