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Spek-X vs Sonic Visualiser: catalog facts
Spek-X	Sonic Visualiser
Free Free and open source under the GPL.	Free Free and open source. Hosting, hardware and any external services are separate.
Windows, Linux	Windows, macOS, Linux
Spectrogram view of audio files Broad format support through FFmpeg	Supports layered audio visualizations Works with analysis plug-ins
Fork with a small maintainer base Updates are infrequent	Designed for analysis rather than multi-track music production.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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