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Vivliostyle vs Apache FOP: catalog facts
Vivliostyle	Apache FOP
Free Free and open source.	Free Free and open source from the Apache Software Foundation.
Web, Command line	Windows, macOS, Linux, Command line
Book layout written in standard CSS Browser viewer and command-line PDF export	Supports PDF/A, PDF/X and PDF encryption Runs from the command line or embedded in Java
Requires familiarity with HTML and CSS Vivliostyle Pub is still in alpha	Requires writing XSL-FO stylesheets Needs a Java runtime
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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