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Equalizer APO vs FxSound: catalog facts
Equalizer APO	FxSound
Free Free and open source under the GPL, distributed through SourceForge.	Free Free and open source. Hosting, hardware and any external services are separate.
Windows	Windows
Works at the system level, so every application on a device is equalised Parametric and graphic filters, with no practical limit on bands	Includes sound presets and equalizer controls Offers system audio enhancement settings
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	Audio effects can change the original sound and depend on the playback setup.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-3.0
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.