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AtomicParsley vs tone: catalog facts
AtomicParsley	tone
Free Free and open source under the GPL-2.0 licence.	Free Free to download and use.
Windows, macOS, Command line	Windows, macOS, Linux, Command line
Small, single-purpose command-line tool Handles iTunes-style tags in MP4 and M4A files	Focused on audiobook metadata Runs on several operating systems
No graphical interface Limited to MPEG-4 files	No graphical interface Requires familiarity with the terminal
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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