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Atticus vs Asciidoctor EPUB3: catalog facts
Atticus	Asciidoctor EPUB3
Paid Sold for $147.	Free Free to download and use; the source is published on GitHub.
Windows, macOS, Linux, Web	Command line
Writing and formatting in the same app Works on Windows, Mac, Linux and Chromebook	Converts AsciiDoc straight to EPUB3 Works within the existing Asciidoctor toolchain
Paid software with an upfront price Closed source	Command-line only, needs a Ruby setup Only useful if your source text is in AsciiDoc
Downloadable app, Web application	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.