Citation Share

Citation Share is the percentage of relevant AI-generated answers that cite your domain as a source across a defined query set, model panel, and recency window. It is increasingly treated as the north-star metric of GEO because it ties directly to authority and downstream traffic in a way that raw visibility does not.

The distinction from plain AI visibility is important. Visibility asks "does my brand appear at all?"—a necessary precondition. Citation share asks the sharper question: "of all the relevant answers, what share actually cite me as a source?" A brand can be mentioned often yet rarely cited with a link, which limits both attribution and the trust signal that a source citation conveys. Citation share captures the stronger outcome.

It is computed by running a representative set of queries across a panel of AI platforms—ChatGPT, Perplexity, Gemini, Google AI Overviews, Copilot—and measuring the proportion of responses that cite your domain, ideally weighted by query importance and refreshed regularly because AI answers change over time. Citation share sits alongside related metrics: reference rate, cited URL rate, brand inclusion rate, and share of model, each measuring a different slice of AI presence.

For GEO teams, citation share is the closest equivalent to share-of-voice in PR. Tracking it per topic, per platform, and over time reveals where you are the trusted source, where competitors dominate, and whether content and authority investments are moving the needle.