WordPress is the easiest platform to fingerprint because it leaves paths, a generator tag and a REST endpoint in plain sight. Run the detector above on any URL, or check the signals yourself below.
Asset paths containing /wp-content/ or /wp-includes/ in the page source
<meta name="generator" content="WordPress 6.x"> — present unless a plugin strips it
A JSON response at /wp-json/ (the REST API, enabled by default)
/xmlrpc.php returning a 405 rather than a 404
Theme stylesheets under /wp-content/themes/<theme-name>/style.css