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ViPER4Android vs JamesDSP: catalog facts
ViPER4Android	JamesDSP
Free The open-source software is available without a license fee.	Free Free and open source under the GPL-3.0.
Android	Linux
Processes audio from every app, not just one player Convolver supports impulse responses for headphone correction	System-wide effects for PipeWire and PulseAudio Scripting and API support
Requires root and a Magisk module install Configuration is overwhelming and easy to make sound worse with	Linux only PulseAudio setup needs separate installation steps
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
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 October 1, 2026

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