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Sonic Visualiser vs Spek-X: catalog facts
Sonic Visualiser	Spek-X
Free Free and open source. Hosting, hardware and any external services are separate.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, Linux
Supports layered audio visualizations Works with analysis plug-ins	Spectrogram view of audio files Broad format support through FFmpeg
Designed for analysis rather than multi-track music production.	Fork with a small maintainer base Updates are infrequent
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account 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.