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m4b-tool vs Audiobook Builder: catalog facts
m4b-tool	Audiobook Builder
Free Free to download and use.	Paid Paid app with a free trial, sold directly and on the Mac App Store.
Windows, macOS, Linux, Command line	macOS
Merges many audio files into one M4B audiobook Splits files and adds chapters	Imports multi-disc CD sets with automatic eject and prompt Chapters with custom names and artwork
Command line only Formal releases are infrequent	macOS only Output is aimed at Apple's Books, Music and iTunes
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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