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Guide · October 2026
More and more agencies offer GEO: the GEO Agency Index Netherlands lists 1,497 of them in October 2026. How do you choose one? This guide sets out the criteria, with figures from our own measurement of all those providers.
Choose an agency that is named by AI itself, that measures results per AI engine, that puts its offer on the table (price, cases, an agreement on results) and that combines GEO with SEO and content. An agency that AI cannot find usually cannot make AI find you either.
| Kind | Strong at | Watch out |
|---|---|---|
| GEO specialist | Deep knowledge of AI search engines, quick with new developments | Often GEO only: content, technology and leads have to come from elsewhere |
| SEO agency with GEO added | Strong technical base and keyword knowledge | Sometimes a new label on the old SEO package, ask how they measure AI mentions |
| Full-service marketing agency | GEO, content and lead generation working together | Check that there is a real measurement per AI engine behind it |
| Tool or software, do it yourself | Cheap and immediate insight | Measuring is not improving: the work and the judgment stay with you |
Of the 1,497 providers in the register, 222 are named often enough for a place in the ranking (at least 5 times in 1,298 AI answers). Ask an agency where it stands, or look it up in the index.
ChatGPT, Gemini, Claude, Perplexity and Google AI Overviews each name different agencies. A good agency reports per engine how often you are named, not just an average.
41 percent of the measurable providers publish prices or price indications, 44 percent have a separate pricing page. No price online does not mean expensive, but it does mean you find out late.
60 percent show cases or client stories. Ask for results in AI search engines, not only in Google.
Only 4 percent mention a guarantee or results agreement; in the top 20 it is 15 percent. A fair agreement is about visibility on search queries you choose together, never about "number 1 in ChatGPT".
49 percent have an llms.txt and 45 percent put frequently asked questions in structured data. In the top 20 that is 80 and 65 percent. An agency that does not do this on its own site probably will not do it for you either.
October 2026. Index from 0 to 100: AI mentions count for half, the technology of the agency's own website and the transparency of its offer for a quarter each.
| Place | Provider | Index | Named in |
|---|---|---|---|
| 1 | Citeerbaar | 83,0 | 12,9% |
| 2 | Timmermans Media | 70,8 | 10,7% |
| 3 | BDMNL | 65,0 | 12,2% |
| 4 | Generativ | 64,4 | 8,4% |
| 5 | GPTBureau | 61,0 | 15,2% |
| 6 | SmartRanking | 60,7 | 7,9% |
| 7 | OpsCode | 58,6 | 6,4% |
| 8 | Maatwerk Online | 56,7 | 7,8% |
| 9 | Onder | 55,4 | 10,0% |
| 10 | Pico Yellow | 55,1 | 6,4% |
The full ranking and the method (in Dutch)
Gold Lemon is a provider itself and the maker of the index. In October 2026 Gold Lemon is in place 17 of 222, marked as the measuring party. That is why this page gives no advice on which agency to choose: the criteria apply to us just as much. Our offer: a fixed price of EUR 699 per month plus EUR 1,499 one-off, cancel monthly, with a 90-day guarantee on visibility.
An agency that makes sure AI assistants such as ChatGPT, Gemini and Perplexity know and recommend your company. GEO stands for Generative Engine Optimization.
SEO focuses on the ranking in Google. GEO focuses on the answers of AI assistants. The basics overlap: good content, a technically healthy site and mentions on other sites.
By asking fixed questions regularly to several AI engines and tracking how often you are named, in which position and as a source. That is how the GEO Agency Index works too.
Technical improvements often count within a few weeks. Mentions in AI answers usually grow over two to six months, depending on how much is already online about your company.
That depends on what you already have. If your content and lead generation are in order, a specialist can be enough. If you want it all in one hand, choose a full-service agency that demonstrably measures per AI engine.