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Valhalla Space Modulator vs Airwindows: catalog facts
Valhalla Space Modulator	Airwindows
Free Free to download from Valhalla DSP.	Free Free and open source, with no DRM.
Windows, macOS	Windows, macOS, Linux
Free with no paid tier Eleven flanging and modulation algorithms	Hundreds of free effects with frequent new releases AU and VST builds for macOS, Windows and Linux
Needs a host program such as a DAW to use Limited to flanging and related modulation effects	Minimal generic interfaces with few visual aids Installation notes vary from plugin to plugin
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account 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.