Guide

Who Does AI Recommend in Your Category? How to Build Your Own Visibility Index

4 min readBy Katy BarnsOctober 26, 2026

Key Takeaways

  • •An AI visibility index ranks the brands in one category by how often AI engines name them
  • •The biggest brand in a category is often not the most visible one in AI answers
  • •Visibility depends on the question asked, so an index needs a fixed, repeatable question set
  • •Each AI engine produces a different ranking, so score them separately
  • •A local business can build a useful mini index with ten questions and three engines
  • •Repeat the check monthly so you can see movement, not just a snapshot

What a category index actually measures

Software and consulting firms now publish AI visibility indexes for whole markets, such as CRM tools. The idea is simple. Ask AI engines a fixed set of buyer questions about a category, record which brands get named, and rank them by how often and how prominently they appear.

It is a market share report for a new kind of shelf. Instead of counting sales, it counts mentions in the answers buyers actually read.

Why the rankings surprise people

Size and visibility do not move together. A large, well-funded brand can sit below a smaller rival because the smaller one has clearer pages, more third-party reviews, and consistent descriptions across the web.

AI engines do not care who spends the most on ads. They pull from sources they trust and repeat what those sources agree on. Brands with a consistent story get named. Brands with a muddled one get skipped.

The question set is everything

A brand can rank first for one question and vanish on another. Best for small teams, cheapest option, easiest to set up, and best for a specific city are all different questions with different winners.

That is why a credible index locks its questions in advance and reruns the same ones each cycle. Change the questions and you cannot tell whether a brand improved or the test simply got easier.

Engines disagree, so keep them apart

ChatGPT, Gemini, and Perplexity pull from different sources and phrase things differently. One brand may lead in Perplexity because it gets cited often, while ChatGPT barely mentions it.

Averaging engines into one number hides that split. If you only see the blended score, you cannot tell which engine to work on.

Build a mini index for your own market

You do not need a research team. Pick ten questions a real customer would ask about your service, and put your city in at least four of them. Run each through three AI engines. Log every business that gets named, in what position, and whether a source is cited.

Put it in a spreadsheet with businesses down the side and questions across the top. After one round you will see who owns your market in AI answers, and who is missing from it.

Read the gaps, not just the rank

The useful part is the empty cells. If a competitor shows up for emergency and pricing questions and you do not, look at what their pages say that yours do not. Usually it is a direct answer, a specific number, or a mention on a site the engines trust.

Then check what the engines say about you when you do appear. Wrong hours, old services, or a mixed-up address are fixable, and fixing them is faster than building new content.

Repeat it on a schedule

One snapshot tells you where you stand. Monthly snapshots tell you whether your work is paying off. AI answers shift as engines update and as competitors publish, so a result from three months ago may not hold.

Keep the question list identical between rounds. Add new questions in a separate tab so your trend line stays clean.

Where OMG fits

OMG automates this kind of tracking and scores each model separately instead of blending them. Starter is $99 a month, Managed is $499, and Pro is $649, and big markets or many locations can talk to us. A Managed plan is $499 a month, or $399 a month billed quarterly.

Managed publishes llms.txt and robots.txt updates and queues blog and FAQ drafts for your approval. Agencies get white-label support across multiple clients. Profound, Otterly, and Semrush's AI tools are alternatives if you mainly want reporting.

To see your own starting point, the free one-off audit at optimizemygeo.com takes a few minutes.

FAQs

What is an AI visibility index?+

It is a ranking of the brands in one category based on how often and how prominently AI engines name them in answers to a fixed set of buyer questions.

Why would a smaller brand outrank a bigger one?+

AI engines favor clear, consistent, well-corroborated information. A smaller brand with sharper pages and more third-party mentions can be named more often than a larger one with a scattered web presence.

How many questions do I need for a useful local index?+

Ten is enough to start, run across three engines. Include your city in several of them and keep the list the same each time you repeat the check.

How often should I rerun the check?+

Monthly works for most businesses. AI answers change as engines update and competitors publish, so a single snapshot goes stale.

Can I do this without a tool?+

Yes. A spreadsheet and thirty minutes is enough for a first round. Tools save time once you want it automated and tracked per engine.

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