People also ask
In practice
Domain scores answer “how strong is this site”; page scores answer “how strong is this page” — and for placements the page question is the sharper one, because the link lives on a page. A domain can carry prestige while the specific article holding your link is a fresh post with no links of its own; conversely, a modest domain’s evergreen resource page can hold serious page-level equity.
Both vendors compute the number from the page’s own backlink profile scaled by the strength of its linkers — Moz’s PA and Ahrefs’ UR differ in their models and are not numerically comparable, and neither comes from Google.
The placement uses: as a tiebreak between relevant publishers (the page that already ranks for the topic usually carries the page-level strength to help); as a read on where in a site your link will sit (a “resources” page with UR 5 on a strong domain is a weaker placement than its metrics suggest); and as an expectation-setter — a link from a page with real equity can move things, a link from a page with none is a bet on the page’s future. What page scores still cannot see: traffic, relevance, audience — the same blind spots as domain metrics, one level down.
The qualification order holds: relevance first, traffic verified, then page-level strength as the tiebreak — never as the headline.
See also: Domain Rating, Metrics that matter when buying links, Site-level vs page-level qualification.
Related service: Link building strategy.
