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puddletag vs SongKong: catalog facts
puddletag	SongKong
Free Free and open source.	Paid Free to preview changes and run a status report; applying fixes requires a paid licence.
Linux	macOS
Spreadsheet view shows all tags for many files at once Tag-from-filename and rename-from-tag patterns	Fixes entire collections automatically instead of album by album Preview mode shows changes before anything is modified
Built primarily for Linux Lacks some features found in Mp3tag	Applying changes requires a paid licence Relies on online databases for identification
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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