WordPress is the more common of the two in our index: it runs on 243,413 websites against 4,384 for TYPO3 CMS, and 421 sites use both. Counts come from real scans of each site's home page, not vendor claims, and cover the sites in TechLookup's index rather than the whole web.
TYPO3 is a free and open-source Web content management system written in PHP.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.
Within the cms sites we have indexed, TYPO3 CMS holds 1.5% and WordPress 81%.
421 sites run both TYPO3 CMS and WordPress. That is 10% of the sites using TYPO3 CMS, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.