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NTag vs puddletag: catalog facts
NTag	puddletag
Free Free and open source under the GPL-3.0.	Free Free and open source.
Windows, Linux	Linux
Batch editing across many files Supports MP3, M4A, M4B, FLAC, OGG and WMA	Spreadsheet view shows all tags for many files at once Tag-from-filename and rename-from-tag patterns
Fewer automation features than larger taggers Small project with a modest user base	Built primarily for Linux Lacks some features found in Mp3tag
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	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 1, 2026	Official website Full listing and sources Checked September 24, 2026

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