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Spek vs MasVisGtk: catalog facts
Spek	MasVisGtk
Free Free and open source under GPLv3.	Free Free and open source under GPL-2.0.
Windows, macOS, Linux	Linux
Shows instantly whether a lossless-looking file was upconverted from a lossy source Uses FFmpeg for decoding, so it opens the formats FFmpeg opens	Analyzes loudness using EBU R128 measurements Shows waveforms and frequency plots
Development is quiet: the last release, 0.8.5, is from January 2023 It only views spectrograms; it cannot edit or convert anything	Designed for GNOME on Linux
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
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 September 20, 2026	Official website Full listing and sources Checked October 8, 2026

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