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Mp3tag vs Kid3: catalog facts
Mp3tag	Kid3
Freemium The Windows version is free and donation-supported. Mp3tag for Mac is a separate paid…	Free Free and open source. Hosting, hardware and any external services are separate.
Windows, macOS	Windows, macOS, Linux, Android
Batch editing of ID3v1, ID3v2.3, ID3v2.4, MP4, WMA, APEv2 tags and Vorbis Comments across many files at once Online lookups from Discogs, MusicBrainz and freedb, including cover art	Supports multiple audio tag formats Can rename files using tag information
Closed source The macOS version costs money after a 7-day trial; only the Windows version is free	Tagging changes metadata rather than repairing the audio itself.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 September 20, 2026	Official website Full listing and sources Checked September 22, 2026

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