AI share of voice is the share of all brand mentions, or of all citations, across a fixed set of AI answers that go to your business rather than to named competitors. To find out whether AI recommends you more than your rivals, run the same buyer questions on each assistant every month, count who gets named, and open the sources each answer cites.
AI assistants name the businesses their sources link most clearly to the question. When a competitor keeps winning, those sources usually describe it more clearly and more often than they describe you. Share of voice is one slice of AI visibility. It is the competitive slice, and it is the closest thing AI search has to shelf position.
How do I measure AI share of voice?
The method is simple and a little tedious, which is why so few people keep it up.
- Write down 15 to 25 questions a buyer in your category would ask, in their words. Write down the competitors you want to compare against. Do not change either list once you start.
- Run every question several times on each assistant you care about, such as ChatGPT, Perplexity and Copilot, each time in a fresh chat.
- In a spreadsheet, give each run one row. Record the date, the assistant, the question, every brand named and every domain cited.
- Count how many times each brand is named. Divide your mentions by all brand mentions across the runs. That figure is your share of voice for the month.
- Repeat the same runs on the same day each month and compare with your first month.
Citation share works the same way with cited pages in place of brand names. Microsoft's Citation Share report in Bing Webmaster Tools measures a related thing for your own site: the percentage of all citations for one grounding query that went to your pages. Microsoft says the report does not show competitor domains and does not represent traffic share.
What does the count look like for a real business?
Take a coffee subscription business on Shopify that competes with three other roasters. The owner freezes 20 questions, such as "best coffee subscription for espresso at home", and runs each one three times on two assistants. That is 120 answers.
Say the four brands are named 150 times in total and the owner's brand appears 30 times. The share of voice is 20%. The number becomes useful next month, when the owner compares it against the same 20 questions. The spreadsheet also shows which sources the assistant cited each time a rival won, and that list tells the owner which pages to work on.
Which sources does the assistant cite when a competitor wins?
Start with evidence, the way an audit does. Before anyone rewrites a page, open the sources the assistant lists. ChatGPT shows citations and a Sources panel when it searches the web. Microsoft says Copilot adds linked citations to answers grounded in web search.
The list tells you what kind of gap you have. If the assistant cites the competitor's own product page, their page is doing a job yours is not. If it cites a review site or a comparison article, the gap is outside your website, and work on your own pages alone will not close it.
What can I fix on my own website?
- Make sure your offer pages state in plain text what you sell, who it is for, what it costs and where you deliver.
- Check that the AI search crawlers can get in through robots.txt and through any firewall or CDN in front of the site. They include OAI-SearchBot for ChatGPT, PerplexityBot for Perplexity and Claude-SearchBot for Claude.
- Make your company facts, such as the name, the address, what you do and who runs it, read the same way on your site, your profiles and your structured data.
OpenAI's help page says a site becomes eligible for ChatGPT search when it allows OAI-SearchBot and when the host or CDN allows traffic from OpenAI's published IP addresses. A welcoming robots.txt behind a firewall that turns the crawler away is an easy gap to miss. The front door test shows how to check it in an afternoon.
How do I earn the sources I do not control?
Reviews, comparison articles and directories carry weight you cannot write yourself. Google says its generative AI features can show what is being said about products and services across the web, including in forum discussions. It also says that seeking inauthentic mentions is not as helpful as it might seem. So the work is slow and done in the open. Ask real customers for reviews, correct wrong listings, and give the writers of comparison articles the facts they need. The citation footprint guide covers where to start.
On Shopify, the AI Mentions feature in the Visibility Mesh app runs buyer questions on AI assistants and shows who each answer names, you or a rival. It does the asking and the counting that the spreadsheet above does by hand.
Questions people ask about AI share of voice
Is share of voice the same as mentions?
Share of voice is not the same as mentions. Mentions count how often you are named. Share of voice compares that count with named rivals across the same questions, so it shows whether you are gaining or losing ground. It cannot show answers outside your question set or whether a mention led to a sale.
I rank on page one of Google, so why does ChatGPT recommend my competitor?
Ranking in Google and being named by ChatGPT draw on different inputs. ChatGPT search uses its own crawler, OAI-SearchBot, and can end up reading a different set of pages. Check that OAI-SearchBot is allowed in robots.txt and by your firewall, then open the sources ChatGPT cites for your competitor.
Can I see which competitors AI cites instead of me?
You can see them answer by answer. ChatGPT, Perplexity and Copilot show the sources behind answers that use web search, so a fixed question set run every month shows which competitor pages get cited. Microsoft says Citation Share in Bing Webmaster Tools does not show competitor domains, so record the cited domains yourself.
Can anyone guarantee that AI will recommend me alongside my competitors?
Nobody can guarantee a recommendation, since each assistant decides its own answers. You can make your offer pages clear, let the AI search crawlers in, keep your company facts consistent and earn real reviews and listings.
Share of voice is one of four measures in our guide to measuring AI visibility. To put the result next to revenue, our guide to the return on AI visibility shows how to keep the record. If a competitor keeps winning the answer, we explain why AI keeps recommending your competitors. The pricing page shows which plans include AI Mentions.
Sources
Searching the web with ChatGPT, OpenAI Help Center, read September 26, 2026: help.openai.com/en/articles/9237897-searching-the-web-with-chatgpt.
Overview of OpenAI crawlers, OpenAI, read September 26, 2026: developers.openai.com/api/docs/bots.
Transparency Note for Microsoft Copilot, Microsoft, August 18, 2026, read September 26, 2026: support.microsoft.com/en-US/microsoft-copilot/transparency-note-for-microsoft-copilot.
New AI Visibility Insights in Bing Webmaster Tools, Microsoft Bing blog, June 2026, read September 26, 2026: blogs.bing.com/search/2026/6/New-AI-Visibility-Insights-in-Bing-Webmaster-Tools-Intents-Topics-Citation-Share-Compare/.
Optimizing your website for generative AI features on Google Search, Google Search Central, last updated July 10, 2026, read September 26, 2026: developers.google.com/search/docs/fundamentals/ai-optimization-guide.