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

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