Share of Voice
Your slice of the total AI citation pie in your category.
Share of Voice is the percentage of all citations in your tracked prompt set that went to your domain, compared to the total citations given to you plus every competitor you track. It is the classic industry metric, applied to AI answer space rather than media impressions or search results.
How it is calculated
For every scan, SurfacedBy counts the total citations across your domain and your tracked competitors. Your Share of Voice is your citations divided by that total, expressed as a percentage. A Share of Voice of 30% means that, within the competitive set you track, 30% of all citations went to your domain.
Comparison window
Share of Voice is calculated per scan. To see how it moves, the analytics view plots it over time. Movement is usually slower than movement in raw AI Mentions because Share of Voice is a ratio; a uniform market-wide lift in AI citation volume does not change your share.
How it differs from Brand Coverage
Brand Coverage and Share of Voice measure different things. Brand Coverage is "what percentage of my prompts cited me" - an absolute hit rate for your own domain, independent of competitors. Share of Voice is "what percentage of all citations in this market went to me" - a comparative share that depends on who else is in the set.
You can have high Brand Coverage and low Share of Voice (you are consistently cited, but competitors are cited more often per prompt), or the reverse.
Per-platform breakdown
Share of Voice also breaks down per AI platform, so you can see whether your slice is even across ChatGPT, Claude, Perplexity, Gemini, and AI Mode, or whether one platform is carrying you while another barely cites you at all. The Compare tab inside Competitors uses the same per-platform Share of Voice to compare you directly against a chosen competitor on the AI platforms you both touch.
Competitor set matters
Share of Voice depends entirely on the competitor list you track. Adding a dominant competitor will drop your Share of Voice; removing one will lift it. The metric is only meaningful when the competitor set reflects your real market. Keep the list curated.