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m4b-tool vs AudioBookConverter: catalog facts
m4b-tool	AudioBookConverter
Free Free to download and use.	Free Free and open source under the GPL-2.0.
Windows, macOS, Linux, Command line	Windows
Merges many audio files into one M4B audiobook Splits files and adds chapters	Flexible chapter handling from files, M4B or CUE data Parallel encoding and a conversion queue
Command line only Formal releases are infrequent	Focused on M4B output only Project page gives little detail on releases or platforms
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0-only
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.