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Audiobook Builder vs AudioBookConverter: catalog facts
Audiobook Builder	AudioBookConverter
Paid Paid app with a free trial, sold directly and on the Mac App Store.	Free Free and open source under the GPL-2.0.
macOS	Windows
Imports multi-disc CD sets with automatic eject and prompt Chapters with custom names and artwork	Flexible chapter handling from files, M4B or CUE data Parallel encoding and a conversion queue
macOS only Output is aimed at Apple's Books, Music and iTunes	Focused on M4B output only Project page gives little detail on releases or platforms
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-only
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.