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