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Screaming Frog is good for crawling an existing Sitemap.xml file and can indeed produce Sitemap.xml files, but if our site is medium-sized (thousands of URLs) then really you'd want a dynamic one. Pretty sure the Yoast SEO plugin for WordPress has this built in with some tweak options and variables, probably start there With Screaming Frog you'd have to keep manually re-building your sitemap XML / XML index file. Sounds pointless, boring and tedious when relatively stable dynamic options exist