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x42 plugins vs FabFilter Pro-L 2: catalog facts
x42 plugins	FabFilter Pro-L 2
Free Described as an open-source plugin collection; check the site for packaged builds.	Paid Paid plug-in with a 30-day trial.
Linux	Windows, macOS
Standards-based level meters (IEC, EBU) Zero-latency equalizer with spectrum analyzer	True peak and broadcast loudness metering Surround support up to Dolby Atmos 9.1.6
Requires an LV2 host or a JACK setup Site gives little release or platform detail	Requires a DAW or plug-in host Commercial license required after the trial
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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