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Vellum vs Asciidoctor EPUB3: catalog facts
Vellum	Asciidoctor EPUB3
Paid Commercial software; prices are listed on the developer's site.	Free Free to download and use; the source is published on GitHub.
macOS	Command line
Produces both ebook and print PDF from one manuscript Store-specific ebook files and box sets from a series	Converts AsciiDoc straight to EPUB3 Works within the existing Asciidoctor toolchain
Only available for Mac, macOS 13 or newer Paid software	Command-line only, needs a Ruby setup Only useful if your source text is in AsciiDoc
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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