Single page vs. entire site — which to use
Single Page is right when you just launched a new landing page, rewrote a big blog post, or want a quick sanity check before publishing. It hits one URL and tests every link on it.
Entire Site (sitemap) is the monthly maintenance scan. It pulls your sitemap.xml, opens up to 25 real pages from your site, and checks every outbound link across all of them — deduped, so you don't see the same broken footer link 25 times. This is how you catch dead links in your header, footer, or old blog posts you forgot about.