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Backdrop CMS vs MODX Revolution: catalog facts
Backdrop CMS	MODX Revolution
Free Free and open source under the GPL-2.0 licence.	Free Free and open source under the GPL-2.0 licence.
Web, Self-hosted	Self-hosted
Built-in upgrade path from Drupal 7 Add-ons install from inside the site	Full control over HTML output and design Supports multi-language and multi-domain sites
Requires PHP and MySQL hosting Add-on selection is narrower than larger CMS ecosystems	Requires PHP hosting and some setup Smaller community than the largest PHP CMSes
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it 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.