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m4b-tool vs Chapterize: catalog facts
m4b-tool	Chapterize
Free Free to download and use.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	Linux
Merges many audio files into one M4B audiobook Splits files and adds chapters	Builds single-file audiobooks with chapters Bulk editing support
Command line only Formal releases are infrequent	Linux only Small project with few contributors
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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 1, 2026

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