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Voxengo SPAN vs TDR Prism: catalog facts
Voxengo SPAN	TDR Prism
Free Available without a software purchase.	Free Distributed by Tokyo Dawn Records as a free plugin.
Windows, macOS	Windows, macOS
Shows frequency spectra and signal statistics Includes correlation and loudness metering	Human auditory model with masking indication Compares spectra from inputs, sidechains, files and other instances
Requires a compatible plug-in host.	Runs as a plugin, so it needs a DAW or plugin host Analysis only, with no processing of the audio
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 2, 2026

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