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Voxengo SPAN vs Friture: catalog facts
Voxengo SPAN	Friture
Free Available without a software purchase.	Free The open-source application is available without a license fee.
Windows, macOS	Windows, macOS, Linux
Shows frequency spectra and signal statistics Includes correlation and loudness metering	Several views of the same live audio input
Requires a compatible plug-in host.	Live analysis requires an audio input source.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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.