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Airwindows vs Valhalla Supermassive: catalog facts
Airwindows	Valhalla Supermassive
Free Free and open source, with no DRM.	Free Free to download from Valhalla DSP.
Windows, macOS, Linux	macOS
Hundreds of free effects with frequent new releases AU and VST builds for macOS, Windows and Linux	22 distinct reverb and delay modes Handles very long decays and repeating echoes
Minimal generic interfaces with few visual aids Installation notes vary from plugin to plugin	Runs as a plugin inside other audio software, not on its own Aimed at large, ambient effects rather than subtle room sounds
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account 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.