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Airwindows vs Valhalla Space Modulator: catalog facts
Airwindows	Valhalla Space Modulator
Free Free and open source, with no DRM.	Free Free to download from Valhalla DSP.
Windows, macOS, Linux	Windows, macOS
Hundreds of free effects with frequent new releases AU and VST builds for macOS, Windows and Linux	Free with no paid tier Eleven flanging and modulation algorithms
Minimal generic interfaces with few visual aids Installation notes vary from plugin to plugin	Needs a host program such as a DAW to use Limited to flanging and related modulation effects
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.