A one-off check
A few questions, one moment
A handful of questions in one system, often in a logged-in account with memory. The outcome depends on chance and on your own history with the system.
AI visibility audit
AI visibility audit
The AI visibility audit shows where AI systems mention your company and where they name competitors instead. 21x puts 30 non-branded customer questions to six AI systems, each one 3 times. You receive a released report with a measurement card and a personal walkthrough.
The 21x AI visibility audit puts 30 customer questions to six AI systems, each one 3 times: 540 answers. You receive the report and a personal walkthrough within 5 to 7 working days.
30 non-branded questions · Six AI systems, 540 answers · 5 to 7 working days · Report with measurement card
Source: IAB, Measuring Visibility in the AI Era, August 2026Updated:
Why an audit
A quick check against a GEO audit that holds up
Many checks test a few questions once, in one system. AI answers change each time a question is asked, so one test is a snapshot rather than a result.
The 21x audit
540 answers, logged out
30 non-branded questions, six systems, each asked 3 times, logged out with memory off. Every answer is assessed on mention, position, sentiment, source and facts.
The difference is repeatability. When the audit is repeated with the same settings, a change in the outcome means something.
How it works
From intake to walkthrough in 5 to 7 working days
Intake
You explain what you sell, who buys it and who you compete with. 21x writes 30 non-branded questions and fixes the list of competitors in advance. English-speaking markets are measured in English, with questions as English-speaking customers ask them; the Dutch market is measured in Dutch.
Access check
21x checks whether AI crawlers can read your site. A blocked crawler can explain a low score before any other factor is considered.
The measurement
The questions go to ChatGPT, Claude, Gemini, Perplexity, Google AI Overviews and Microsoft Copilot 3 times per question. Logged out, with memory off: 540 answers.
Assessment
Each answer is assessed on five points: mention, position, sentiment, source and facts. That shows how you are named, and whether what is said about you is correct.
Report and walkthrough
You receive a released report with a measurement card. Stan Vreuls then takes you through the findings and the first steps that follow from them.
The measurement card
What the measurement card records
Example with fictitious data. Every report includes a measurement card, so anyone can see how the figures were produced and repeat the audit.
Without a measurement card, a percentage cannot be checked or compared with a later measurement. With one, the next audit uses exactly the same settings.
UpciteExample
Question
Measurement card for a fictitious recruitment agency in Birmingham
- Questions50 non-branded, English, UK market
- SystemsChatGPT, Claude, Gemini, Perplexity, Google AI Overviews, Microsoft Copilot
- Measurement moments3 per question
- SessionLogged out, memory off
- Attempts540
- Competitors8, fixed before the measurement
- Named in104 of 540 answers
Named in
19%
of attempts. The report breaks this down per system and per question.
What you receive
What you receive after 5 to 7 working days
The audit ends with a released report and a conversation. In the report you find:
- The measurement card, recording what was measured and how.
- Results per system and per question: where you are named, in what position and with what sentiment.
- The sources the answers rely on in your market, including those where competitors appear and you do not.
- The facts AI systems state about your company, with errors marked.
- Whether AI crawlers can read your site.
In the personal walkthrough, Stan Vreuls explains the findings and what to do first. The report is yours: you can act on it yourself, with your own agency or with 21x.
Price and timing
What the audit costs and what can follow
After the audit you decide whether anything follows. You know the cost before the audit starts.
21x
Know where you stand
Basecamp
Insight into 9 areas, 3 to 5 priorities and advice on your next step.
€295one-off
excl. VAT
Wat zit erin?
- Scorecard on 9 GEO areas
- Technical check: schema, robots.txt, sitemap and llms.txt
- 30 questions, each asked 3 times, on 6 AI platforms
- PDF with concrete improvements
- 30 minutes together through the report
- Analysis without implementation
5 to 7 working days
Discuss BasecampWhy six systems
Why a GEO audit needs more than one AI system
AI systems differ in market share and in how they answer. Both differences show up in the data.
51.3%
estimated market share of ChatGPT among AI chatbots in July 2026, so almost half the market is elsewhere
Bron: First Page Sage, July 2026
94%
of fifty Dutch buying questions were answered by Claude with a company or platform named
Bron: Writgo AI Citation Index, July 2026
0%
of the same questions were answered by Google AI Overviews with a company or platform named
Bron: Writgo AI Citation Index, July 2026
An audit in ChatGPT alone would miss almost half the market. And a system that never names companies needs a different approach from one that nearly always does.
Questions
Questions about the AI visibility audit
What is the difference between an AI visibility audit and a GEO audit?
In substance, none. Both terms describe measuring where AI systems mention a company, and how. 21x uses AI visibility audit because it says what is measured.
Why non-branded questions?
A question that contains your name tests whether a system knows you, not whether it recommends you. Buyers who do not know you yet ask without a name. Those are the questions that bring in new customers.
Why measure logged out?
A logged-in account with memory reflects your own history with the system. Logged out, the answer is closer to what a new customer sees. 21x records this setting on the measurement card.
Can the audit be done in English?
Yes. For English-speaking markets, 21x measures in English, with questions phrased the way English-speaking customers ask them. For the Dutch market, it measures in Dutch.
What happens after the audit?
You decide. You can act on the report yourself, with your own agency, or have 21x build what scored weak. A monthly re-measurement is optional and shows whether that work moves the answers. The packages show what can follow the audit.
Will AI systems mention me more after the audit?
Not from the audit alone: it measures, it does not change anything. Whether mentions increase depends on the work that follows and on the systems themselves. 21x does not guarantee mentions or positions.
Who carries out the audit?
21x, run by Stan Vreuls in Maastricht, the Netherlands. He combines eleven years of SEO experience with a focus on AI visibility that began in January 2026. He also gives the walkthrough.
Next step
Find out where AI systems mention you
Stan Vreuls, Founder of 21x
In a call you hear whether the audit makes sense for your company and which questions it would cover. Stan will also tell you when an audit is not worth it.
stan@21x.nl