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FxSound vs Equalizer APO: catalog facts
FxSound	Equalizer APO
Free Free and open source. Hosting, hardware and any external services are separate.	Free Free and open source under the GPL, distributed through SourceForge.
Windows	Windows
Includes sound presets and equalizer controls Offers system audio enhancement settings	Works at the system level, so every application on a device is equalised Parametric and graphic filters, with no practical limit on bands
Audio effects can change the original sound and depend on the playback setup.	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
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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