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Blue Cat's FreqAnalyst vs Voxengo SPAN: catalog facts
Blue Cat's FreqAnalyst	Voxengo SPAN
Free Available without a software purchase.	Free Available without a software purchase.
Windows, macOS	Windows, macOS
Provides real-time spectrum analysis Supports common desktop plug-in formats	Shows frequency spectra and signal statistics Includes correlation and loudness metering
Requires a compatible audio plug-in host.	Requires a compatible plug-in host.
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	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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