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Antenna House Formatter vs Apache FOP: catalog facts
Antenna House Formatter	Apache FOP
Paid Commercial licences with paid maintenance; a trial download is available.	Free Free and open source from the Apache Software Foundation.
Linux	Windows, macOS, Linux, Command line
Supports both XSL-FO and CSS for Paged Media Long development history with regular releases	Supports PDF/A, PDF/X and PDF encryption Runs from the command line or embedded in Java
Paid commercial licence Aimed at automated publishing rather than editing existing PDFs	Requires writing XSL-FO stylesheets Needs a Java runtime
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	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.