Citation share is the share of AI answers on a topic that cite your brand, counted against every answer on that topic, yours and your competitors' alike.
It's the nearest thing AI search has to a ranking position. Ask an engine a category question a hundred times and each answer either names and links you or it doesn't. Citation share rolls that up: out of a hundred relevant answers, you might appear in twelve, and the other eighty-eight went to someone else.
The word "share" is doing real work here. A ranking you can lift on your own. Citation share you can only lift at a competitor's expense, by winning answers you were missing or displacing a rival who held them. That makes it a scoreboard rather than a score.
It sits at the center of any AI-visibility report because it maps to the question every marketer already asks: where do I stand? A ranking told you where you sat on a page. Citation share tells you how often you're actually inside the answer someone reads, which in a world of zero-click search is much closer to whether you were seen at all.
Measuring it means settling on a set of buyer prompts for your category (this is where prompt coverage comes in), running them across ChatGPT, Perplexity, AI Overviews and the rest, then counting your citations against the total, tracked over time and against the competitors you actually lose to. Watch that number move and you can tell whether your AEO work is doing anything.
Related terms
- Prompt Coverage: the breadth of questions you answer, which feeds this
- LLM Visibility: the broader category this metric sits under
- Answer Engine Optimization (AEO): the work that moves it