# What Is AI Share of Voice? Definition and How to Measure It

**Definition:** AI share of voice is the percentage of all brand mentions in AI-generated answers that belong to your brand, measured across a fixed set of prompts. Each brand counts once per answer it appears in. If brands are named 200 times across your tracked answers and 50 of those mentions are yours, your share of voice is 25%.

**Published:** September 30, 2026  
**Author:** Connor Lahey

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## How AI share of voice works

Share of voice started as an advertising metric: a brand's share of all the advertising in its category. AI share of voice applies the same idea to the answers AI engines like ChatGPT and Perplexity give when people ask about your market.

Before you can measure it, you need a fixed prompt set. These are the questions your buyers ask AI engines, like "best project management software for agencies," and the set has to stay the same between checks or the numbers stop being comparable. You also need a competitor list, because share of voice is relative and the result depends on which brands you count.

Each prompt should run several times per check, because the same question can name different brands from one run to the next. Every answer that names a tracked brand counts as one mention for that brand. An answer that names your brand three times still counts once.

## The AI share of voice formula

**AI share of voice = (answers that mention your brand ÷ total mentions across all tracked brands) × 100**

Say you track 100 prompts and three brands. Across the answers:

| Brand | Answers that mention it | Share of voice |
|---|---|---|
| Your brand | 20 | 25% |
| Competitor A | 40 | 50% |
| Competitor B | 20 | 25% |
| **Total** | **80** | **100%** |

Competitor A has twice your share of voice, which means AI engines put it in front of buyers twice as often as they put you, at least for these 100 prompts.

## AI share of voice vs AI visibility score

The two metrics are easy to mix up because they're both percentages built from the same answers. They use different denominators.

[AI visibility score](https://www.searchable.com/glossary/ai-visibility-score) divides the answers that mention you by *all tracked answers*, including answers that name no brand at all. In the example above you appear in 20 of 100 answers, so your visibility score is 20%. AI share of voice ignores the answers that name nobody and divides by *all brand mentions* instead, which puts you at 25%.

That difference matters when competitors drop out. If Competitor A vanishes from half its answers, your share of voice goes up even though AI engines aren't mentioning you any more often than before. That's why it's worth reporting the two side by side.

## Why AI share of voice matters

When someone asks an AI engine for a recommendation, the answer usually names a short list of brands, and there's no second page to scroll to. A brand that isn't on that list doesn't get considered, however well it ranks in traditional search.

Share of voice tells you who AI engines put on that list for your category and how often. Leadership teams also tend to get it quickly, since it maps onto the market-share language they already use.

## How to measure AI share of voice

The arithmetic is easy. The prompt set takes most of the effort, and four decisions shape the result.

- **Use unbranded prompts.** Prompts that already name your brand will almost always return your brand. Across 3,736 brands tracked in Searchable (30 days to September 17, 2026), the median brand was named in 93% of answers to branded prompts and 7% of answers to unbranded ones, so mixing the two inflates your share of voice. See [branded vs unbranded prompts](https://www.searchable.com/glossary/branded-vs-unbranded-prompts).
- **Split by engine.** A strong share of voice in ChatGPT can hide a weak one in Google AI Overviews.
- **Split by topic.** One blended number hides the topics you win and the ones you lose, so group prompts by product line or use case.
- **Keep the competitor list stable.** Adding a competitor lowers everyone else's share, so note the date in your reporting when you do.

Doing this by hand gets slow. Twenty prompts, run three times each across four engines, is 240 answers to read and tally every week. [Searchable](https://www.searchable.com/features/aeo-insights/visibility) runs your prompt set on a schedule and calculates share of voice for your brand and each competitor, with the day-over-day change for each. You can filter it by engine or break it down by topic and location. The method behind it is in our guide to [AI visibility tracking](https://www.searchable.com/blog/ai-visibility-tracking).

## How to increase AI share of voice

AI engines recommend brands they see described consistently across sources they trust. Start with the prompts where competitors appear and you don't, then look at which sources the engine cited in those answers.

Those sources are often third-party comparisons, reviews, and "best of" lists. If a list the engine keeps citing leaves you out, getting onto it is a concrete fix with a clear owner.

Your own site matters too. Pages that say plainly who your product is for and what it costs give an engine something specific to repeat. And if AI engines describe your product wrongly, they're less likely to recommend it for the right prompts, so track [AI brand sentiment](https://www.searchable.com/blog/ai-brand-sentiment) alongside share of voice.

Expect changes to take a while to show up. Judge progress across several weeks of tracking, since a single before-and-after check can swing on run-to-run noise alone.

## Frequently asked questions

### How is AI share of voice calculated?

Count how many tracked AI answers mention each brand (yours and every competitor's), then add those counts together. Divide your brand's count by the total and multiply by 100. If your brand appears in 50 answers and all tracked brands together appear 200 times, your share of voice is 25%.

### What does 50% share of voice mean in AI search?

It means half of all the brand mentions in your tracked AI answers are yours. With several competitors in the set, that usually makes you the brand AI engines recommend most often for those prompts.

### What is a good AI share of voice?

It depends on how many brands you track. With four brands, an even split is 25%, so anything above that means AI engines mention you more than your fair share. The more useful comparisons are the category leader's number and your own trend over time.

### Is AI share of voice the same as AI visibility score?

No. Visibility score divides the answers that mention you by every tracked answer, so it shows how often you show up at all. Share of voice divides your mentions by all brand mentions, so it shows how you stack up against competitors in the answers that name brands.

### Does AI share of voice differ between ChatGPT and Google AI Overviews?

Yes, often by a lot. Each engine finds and weighs sources in its own way, so the same prompt can name different brands on each one. Measure share of voice per engine first and only then combine the numbers.

### How often should you measure AI share of voice?

Weekly works for most brands. AI answers vary from one run to the next, so run each prompt several times per check and look at the trend over several weeks before reacting to a change.

### How is AI share of voice different from SEO share of voice?

SEO share of voice estimates your share of the organic clicks for a set of keywords, weighted by each keyword's search volume and your ranking. AI share of voice counts how often AI answers to your tracked prompts name your brand compared with competitors. A brand can lead one and trail the other, so track them separately.

## Related terms

- [AI visibility score](https://www.searchable.com/glossary/ai-visibility-score): An AI visibility score is the percentage of tracked AI answers that mention your brand. You divide the answers that name you by every answer in your tracked prompt set, including answers that name no brand at all. If your brand appears in 30 of 100 tracked answers, your AI visibility score is 30%.
- [AI brand mentions](https://www.searchable.com/glossary/ai-brand-mentions): AI brand mentions are the times an AI engine like ChatGPT or Google AI Overviews names your brand in an answer. A mention counts whether or not the answer links to your website. That's the difference from a citation, where the engine credits a specific page as its source.
- [AI citations](https://www.searchable.com/glossary/ai-citations): AI citations are the links an AI engine attaches to its answer to show which web pages the information came from. Each citation credits a specific URL. A brand mention is different: the engine names a company in the text, even when it doesn't link to that company's site.
- [Prompt tracking](https://www.searchable.com/glossary/prompt-tracking): Prompt tracking is running a fixed set of buyer questions through AI engines like ChatGPT and Perplexity on a schedule, then recording which brands and sources appear in each answer and where they rank. Comparing the same prompts over time shows whether your AI visibility is rising or falling.
- [Branded vs unbranded prompts](https://www.searchable.com/glossary/branded-vs-unbranded-prompts): Branded prompts are AI questions that name your company, such as "Is Acme good for agencies?" Unbranded prompts describe a need without naming any brand, such as "best project software for agencies." Tracking unbranded prompts shows whether AI engines recommend you to buyers who don't know you yet.
- [AI visibility tracking](https://www.searchable.com/blog/ai-visibility-tracking): Measuring AI visibility over time by running the same prompts across engines and comparing mentions, citations, and positions from run to run.

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