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Kotobee Author vs Vellum: catalog facts
Kotobee Author	Vellum
Freemium Free license and a 30-day trial are available, with paid plans for more features.	Paid Commercial software; prices are listed on the developer's site.
Windows, macOS, Linux	macOS
Exports to EPUB, HTML5, desktop and mobile apps SCORM and LTI export for learning management systems	Produces both ebook and print PDF from one manuscript Store-specific ebook files and box sets from a series
Advanced publishing and distribution features sit in paid plans Aimed at publishers and educators, more than a simple ebook converter needs	Only available for Mac, macOS 13 or newer Paid software
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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