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Vellum vs Atticus: catalog facts
Vellum	Atticus
Paid Commercial software; prices are listed on the developer's site.	Paid Sold for $147.
macOS	Windows, macOS, Linux, Web
Produces both ebook and print PDF from one manuscript Store-specific ebook files and box sets from a series	Writing and formatting in the same app Works on Windows, Mac, Linux and Chromebook
Only available for Mac, macOS 13 or newer Paid software	Paid software with an upfront price Closed source
Downloadable app	Downloadable app, Web application
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 23, 2026	Official website Full listing and sources Checked September 23, 2026

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