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Asciidoctor EPUB3 vs Standard Ebooks Toolset: catalog facts
Asciidoctor EPUB3	Standard Ebooks Toolset
Free Free to download and use; the source is published on GitHub.	Free Free and open source.
Command line	macOS, Linux, Command line
Converts AsciiDoc straight to EPUB3 Works within the existing Asciidoctor toolchain	Lints ebook source against a detailed style guide Builds finished EPUB files
Command-line only, needs a Ruby setup Only useful if your source text is in AsciiDoc	Command line only Built around the Standard Ebooks conventions
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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