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Source score is the share of answers that cite at least one page on your own website. Where brand visibility tells you whether the assistants talk about you, source score tells you whether they use your site to build their answers.

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How it’s calculated

It counts all answers, including those that name no brand: an answer can use your page without naming anyone. It’s calculated for each assistant, then averaged with every assistant counting equally. Example. Of ChatGPT’s 150 answers in the last 28 days, 21 listed a page from acme.com among their sources: 14%. Of Perplexity’s 50, 5 did: 10%. Your source score is 12%.
Source Score Over Time chart

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Which pages count as yours

A citation counts when it points to the domain set on your project, or any subdomain of it:
Review sites and articles about you don’t count towards source score, even though they help your visibility. To see every site the assistants cite — yours and everyone else’s — open the Sources pages.

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Why the two numbers differ

Visibility and source score aren’t meant to match. It’s common to be named often but rarely cited — the assistant has learned about you from other sites. It’s also possible to be cited without being named, when an assistant uses your content to answer a general question. A low source score next to a healthy visibility usually means your own pages aren’t the ones the assistants reach for. Agent Analytics shows whether their crawlers can read those pages at all.