AI share of voice: what it is and how to measure it

Share of voice is your slice of all the brand mentions in your category across AI answers, versus your tracked competitors. How it differs from visibility, how it is calculated, why the competitor set makes or breaks the number, and how to measure it.

AI share of voice is your slice of all the brand mentions in your category across AI answers, measured against the specific competitors you track. If ten brand mentions show up across the AI answers for your buying questions and three of them are you, your share of voice is 30%. It answers a different question than "am I named at all." It tells you how big your piece of the conversation is compared to your rivals.

Share of voice vs visibility (they are not the same)

People mix these up, so here is the clean distinction:

Visibility asks: out of every 100 AI answers, how many name you at all? It is a yes/no counted across answers.
Share of voice asks: of all the brand mentions happening in your category, what fraction are yours? It is a slice of a pie you share with competitors.

You can have decent visibility and weak share of voice, named sometimes, but buried under a competitor who is named far more often. Or high share of voice in a small, quiet category where few brands come up at all. You want both numbers, because they catch different problems. For the full set of metrics, see AI visibility tracking: the complete guide.

How AI share of voice is calculated

The math is simple; the judgment is in the setup.

your mentions / total mentions across your tracked competitor set = your share of voice

Across the AI answers for your buying questions, count every brand mention, yours and your competitors', then take your portion. The one decision that matters is which competitors you include. Too broad (every tangential player) and your slice looks tiny and meaningless. Too narrow (leaving out a real rival) and you flatter yourself. Pick the businesses a customer would genuinely compare you against. That set defines the pie.

Why it is worth tracking

Share of voice is the competitive number. Three things it does that visibility alone cannot:

It catches a competitor's rise early. If a rival's slice is growing month over month, they are getting into more of the cited sources, and you will feel it in lost customers before you would otherwise notice.
It sets a realistic target. "Be named more" is vague. "Move from 15% to 25% of the mentions in our category" is a goal you can work toward and prove.
It reframes the work as a fight for a share, not a solo score. Every mention a competitor loses and you gain moves the number twice.

How to measure it without doing math by hand

Doing this manually means logging every brand named in every answer across every engine, then tallying, which no one keeps up for long. A tracker does the counting for you against your competitor set. SearchVis reports share of voice alongside visibility and shows the sources behind the mentions, so you can see not just that a competitor's slice is bigger but which pages are feeding it. There is a free tier to start.

Common mistakes

Confusing it with visibility and thinking one number tells the whole story. Read them together.
Picking the wrong competitor set. This single choice can make your share look great or terrible. Choose the rivals a real buyer weighs you against.
Chasing share in a category no one asks about. If few brands come up at all, winning the slice is a hollow victory. Check that the questions have real volume first.

Frequently asked questions

What is AI share of voice? Your portion of all the brand mentions in your category across AI answers, measured against a set of tracked competitors. Thirty percent means three of every ten brand mentions in your space are you.

How is it different from visibility? Visibility is whether you are named at all, counted across answers. Share of voice is your slice of the total mentions versus competitors. Different questions, both worth watching.

How do I choose which competitors to include? Use the businesses a customer would actually compare you against. That set defines the pie and heavily shapes the number.

Why is a competitor's share of voice going up? Because they are getting into more of the sources the AI reads. See why ChatGPT recommends your competitors.

The bottom line

Visibility tells you if you are in the game; share of voice tells you how much of it you own. Track both, pick your competitor set honestly, and treat every point of share as something to take from a rival. Start with a free visibility check to see your slice today.