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AtomicParsley vs puddletag: catalog facts
AtomicParsley	puddletag
Free Free and open source under the GPL-2.0 licence.	Free Free and open source.
Windows, macOS, Command line	Linux
Small, single-purpose command-line tool Handles iTunes-style tags in MP4 and M4A files	Spreadsheet view shows all tags for many files at once Tag-from-filename and rename-from-tag patterns
No graphical interface Limited to MPEG-4 files	Built primarily for Linux Lacks some features found in Mp3tag
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account 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 24, 2026

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