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Apache FOP vs Vivliostyle: catalog facts
Apache FOP	Vivliostyle
Free Free and open source from the Apache Software Foundation.	Free Free and open source.
Windows, macOS, Linux, Command line	Web, Command line
Supports PDF/A, PDF/X and PDF encryption Runs from the command line or embedded in Java	Book layout written in standard CSS Browser viewer and command-line PDF export
Requires writing XSL-FO stylesheets Needs a Java runtime	Requires familiarity with HTML and CSS Vivliostyle Pub is still in alpha
Downloadable app	Downloadable app, Web application
Open source	Open source
License: Apache-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.