AI SEO

AI SEO agency

21x is an AI SEO agency that works on two channels at once: AI answers and Google. That means being named by ChatGPT, Gemini and Perplexity, and being found in classic search results. It does not mean SEO content written by AI tools.

Direct answer

An AI SEO agency works on visibility in AI answers from systems such as ChatGPT, plus classic SEO for Google. At 21x it does not mean content written by AI tools. Both channels are measured.

AI answers plus classic SEO · Six AI systems measured · Google: more than 87% of search referrals · Not content written by AI tools

Source: Cloudflare Radar, July 2026Updated:

What AI SEO means

Two meanings of AI SEO, and the one 21x works on

The term AI SEO is used for two different things. Which one an agency means determines what you pay for.

AI SEO as a production method

Content made with AI tools

SEO pages produced with AI tools, often in large numbers. The aim is more pages for the same budget. It says nothing about whether AI systems name your company.

AI SEO at 21x

Visibility in AI answers and in Google

Being named in the answers of ChatGPT, Claude, Gemini and other AI systems, and being found in Google. Both are measured, per system and per month.

21x does not sell content by volume. What you pay for is measured work on two channels, with a report that shows both.

How it works

How AI SEO services from 21x cover both channels

One plan for two channels, because much of the groundwork is shared.

  1. Measure both channels

    Your Google rankings and your visibility in six AI systems, side by side. The AI part uses 30 non-branded questions: in English for English-speaking markets, phrased as English-speaking buyers phrase them, and in Dutch for the Dutch market.

  2. Fix the shared foundation

    A site that crawlers can read, with fast pages and a clear structure, helps in Google and in AI answers. 21x starts here, because one fix serves both channels.

  3. Make your company recognisable

    Consistent company details on your site, platforms and directories. AI systems combine many sources, and conflicting details make it harder for them to describe you correctly.

  4. Write for answers, not for volume

    Pages that state facts clearly, quote sources and include figures with a source. In a controlled study, these changes increased visibility while keyword stuffing reduced it.

  5. Report both channels monthly

    One monthly report with Google and AI answers side by side. You see where they move together and where they diverge.

Why both channels are measured

A top Google ranking does not mean a mention in AI answers

Example with fictitious data. Each row is one customer question, with the company's Google position and how often six AI systems named it in 30 attempts.

This is why 21x reports the two channels separately. Optimising for one and assuming the other follows leaves gaps you cannot see.

UpciteExample

Question

A fictitious payroll software provider for small charities

  • Best payroll software for small charitiesGoogle #2 · AI: 4 of 30
  • Payroll software that handles pension auto-enrolmentGoogle #6 · AI: 14 of 30
  • How to switch payroll provider mid-yearGoogle #1 · AI: 0 of 30
  • Affordable payroll for charities with under ten staffNot in top 10 · AI: 9 of 30
  • Payroll software recommended by accountantsGoogle #8 · AI: 2 of 30

Named in AI answers

29 of 150

attempts across five questions. The question where the company ranks first in Google is the one where AI systems never name it.

What it costs

What AI SEO costs

You can start with the audit, with SEO, or with both. Which comes first depends on where you stand in each channel.

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 Basecamp
21x

Fix the foundation

Climb

Basecamp plus implementation of the most important improvements to your website.

€695one-off

excl. VAT

Wat zit erin?
  • Full Basecamp included (€295)
  • Baseline and follow-up measurement after 4 weeks
  • Sharpen business profile, content and structure
  • Basic structured data and answer blocks
  • Check crawler access and sitemap
  • Improve internal links on main pages

10 to 14 working days

Discuss Climb
21x

Take a bigger step

Summit

A complete improvement round for your most important pages, with an agreed scope.

€1,995one-off

excl. VAT

Wat zit erin?
  • Analysis and implementation included
  • Improve business profile and key pages
  • Answers to 10 important customer questions
  • Technology, AI access and speed
  • Before and after measurement: 30 to 50 questions, each asked 3 times
  • Weekly update and a 30 minute call
  • Delivery advice and plan for what comes next

3 to 6 weeks

Discuss Summit
21x

Keep climbing

Altitude

Digital PR, monthly measurements and upkeep of the information about your business.

€695/ month

excl. VAT

Wat zit erin?
  • Baseline and monthly measurement on 6 AI platforms
  • Research into the sources AI uses
  • Profiles, pitches, press releases and listings
  • Quarterly comparison with competitors
  • Maintain schema, llms.txt, business facts and crawler access
  • Monthly report with work and next steps
  • Upcite account included (not charged separately)

Minimum 3 months
Then cancel monthly

Discuss Altitude

Both channels share much of the groundwork, so work on one often helps the other.

Where traffic and answers come from

Why AI SEO services still include classic search

Two sources, two angles. One shows where website visits come from, the other which AI chatbots people use.

  • >87%

    of all search referrals to websites in July 2026 were sent by Google

    Bron: Cloudflare Radar, July 2026

  • 51.3%

    estimated market share of ChatGPT among AI chatbots in the same month

    Bron: First Page Sage, July 2026

  • 27.7%

    estimated market share of Gemini, Google's own AI assistant

    Bron: First Page Sage, July 2026

Google still delivers most visits, so classic SEO stays part of the work. Among AI chatbots, ChatGPT and Gemini together hold about four fifths of the market. AI SEO that ignores either channel leaves out a large part of where buyers look.

Questions

Questions about AI SEO agencies

Does an AI SEO agency write content with AI tools?

Some do, and they use the term for exactly that. At 21x, AI SEO means visibility in AI answers combined with classic SEO. You pay for work on both channels that is measured every month, not for a number of pages.

What do AI SEO services cost?

That depends on the size of your site, the competition in your market and what the audit shows needs work. You can start with one channel or work on both from the outset. The packages show the options, and you know the cost before work starts.

Is AI SEO the same as GEO?

The terms overlap. GEO, short for generative engine optimisation, is the term used in research and covers visibility in AI answers only. AI SEO, as 21x uses it, combines that with classic SEO for Google.

Will AI search replace Google?

21x makes no forecast about that. According to Cloudflare Radar, Google still sent more than 87% of search referrals to websites in July 2026, and ChatGPT 0.9%. Working on both channels means you do not depend on one.

Which AI systems does 21x measure?

ChatGPT, Claude, Gemini, Perplexity, Google AI Overviews and Microsoft Copilot. Results are split per system, since one may name your company where another names a competitor or nobody at all.

Can you guarantee that my company appears in AI answers?

No. The same question can produce different answers from one day to the next, outside any agency's control. 21x measures where you stand, does the work the measurement points to and shows each month what moved.

Next step

See where you stand in Google and in AI answersStan Vreuls, your contact at 21x

Stan Vreuls, Founder of 21x

In a call you hear whether the audit or SEO comes first for your company. If neither makes sense yet, you will hear that too.

stan@21x.nl