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Asciidoctor EPUB3 vs Vellum: catalog facts
Asciidoctor EPUB3	Vellum
Free Free to download and use; the source is published on GitHub.	Paid Commercial software; prices are listed on the developer's site.
Command line	macOS
Converts AsciiDoc straight to EPUB3 Works within the existing Asciidoctor toolchain	Produces both ebook and print PDF from one manuscript Store-specific ebook files and box sets from a series
Command-line only, needs a Ruby setup Only useful if your source text is in AsciiDoc	Only available for Mac, macOS 13 or newer Paid software
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 23, 2026

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