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AtomicParsley vs Kid3: catalog facts
AtomicParsley	Kid3
Free Free and open source under the GPL-2.0 licence.	Free Free and open source. Hosting, hardware and any external services are separate.
Windows, macOS, Command line	Windows, macOS, Linux, Android
Small, single-purpose command-line tool Handles iTunes-style tags in MP4 and M4A files	Supports multiple audio tag formats Can rename files using tag information
No graphical interface Limited to MPEG-4 files	Tagging changes metadata rather than repairing the audio itself.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	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.