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