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Asciidoctor EPUB3 vs Kotobee Author: catalog facts
Asciidoctor EPUB3	Kotobee Author
Free Free to download and use; the source is published on GitHub.	Freemium Free license and a 30-day trial are available, with paid plans for more features.
Command line	Windows, macOS, Linux
Converts AsciiDoc straight to EPUB3 Works within the existing Asciidoctor toolchain	Exports to EPUB, HTML5, desktop and mobile apps SCORM and LTI export for learning management systems
Command-line only, needs a Ruby setup Only useful if your source text is in AsciiDoc	Advanced publishing and distribution features sit in paid plans Aimed at publishers and educators, more than a simple ebook converter needs
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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