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AudioBookConverter vs m4b-tool: catalog facts
AudioBookConverter	m4b-tool
Free Free and open source under the GPL-2.0.	Free Free to download and use.
Windows	Windows, macOS, Linux, Command line
Flexible chapter handling from files, M4B or CUE data Parallel encoding and a conversion queue	Merges many audio files into one M4B audiobook Splits files and adds chapters
Focused on M4B output only Project page gives little detail on releases or platforms	Command line only Formal releases are infrequent
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-only	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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