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Concrete CMS vs Backdrop CMS: catalog facts
Concrete CMS	Backdrop CMS
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-2.0 licence.
Self-hosted	Web, Self-hosted
Permissive MIT licence Long-running project with legacy branches available	Built-in upgrade path from Drupal 7 Add-ons install from inside the site
Needs a PHP server and Composer to install Older concrete5 sites need upgrading to reach version 9	Requires PHP and MySQL hosting Add-on selection is narrower than larger CMS ecosystems
Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: GPL-2.0
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 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.