Generative Engine Optimization

GEO agency: get cited by ChatGPT, Perplexity and AI Overviews

Nexum Digital is a GEO agency based in Genk, Limburg. Generative Engine Optimization makes sure AI systems such as ChatGPT, Perplexity, Gemini and Google AI Overviews use your site as a source for their answers. That requires different work than classic SEO: first a technical foundation AI crawlers can actually read, then content that is citable passage by passage.

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The question every GEO audit starts with

Can an AI crawler actually read your page? None of the major AI crawlers execute JavaScript — not GPTBot, not ClaudeBot, not PerplexityBot, not OAI-SearchBot. They only read the HTML your server sends. If your site runs on a JavaScript framework without server-side rendering, they see an empty page, no matter how good your content is.

We fetch your pages the way a crawler does, without JavaScript, and measure per URL what actually arrives. That is the first step, before content even enters the conversation.

That step is often skipped because it is invisible in a browser. Anyone visiting your site with JavaScript enabled simply sees the full page and assumes everything is fine. An AI crawler sees something else: sometimes an empty body, sometimes only a loading screen, sometimes fragments without the core message. Only by looking at the raw HTML response as the crawler receives it does it become clear where things go wrong. That is why every GEO audit starts with that technical check, per page and per bot, before we touch the content itself.

What we do

A GEO project consists of a series of concrete interventions, from technical foundations to ongoing measurement:

• •Crawlability audit: every URL fetched without JavaScript, showing per page what an AI crawler actually sees
• •Server-side rendering and prerendering, so content, metadata and schema are present in the delivered HTML
• •Content structuring: answers at the top, self-contained passages, tables and definitions
• •Entity building: consistent mentions of your company name, location and services in structured data
• •robots.txt and llms.txt correctly configured for AI crawlers
• •Monthly measurement of your mentions in ChatGPT, Perplexity and Google AI Overviews

These interventions build on each other. A technical foundation without rewritten content delivers little, because a crawler that can read your page then still finds long, unstructured text that is hard to cite. Conversely, perfectly structured content is worth little if the crawler can't reach it at all. That is why the technical and content tracks run in parallel with us, with the crawlability audit as the starting point and the monthly measurement as feedback on what works.

SEO and GEO side by side

Classic SEO and GEO share a foundation, but differ in goal, what gets rewarded, and how they are measured. The table below sets out the main differences.

What makes AI engines cite you

A meta-analysis of dozens of studies shows that the accessibility of a URL is the strongest citation factor — even ahead of organic search position. Next come: content that directly answers the question asked, passages that are readable on their own, structured comparisons, and brand mentions elsewhere on the web. The latter correlate considerably more strongly with AI visibility than backlinks do — a shift most SEO strategies have not yet caught up with.

Content type matters too. Blog and knowledge-base content accounts for well over half of all citations in AI answers, while press releases are cited almost never.

In practice this means that investing in durable knowledge-base content usually pays off more than isolated news items or promotional pages. An AI system assembling an answer looks for a passage that directly answers the user's question, without the reader first having to wade through a long introduction. Pages written on that principle — a clear question followed by a compact, complete answer — have a structural advantage regardless of their overall length.

How we measure it

Classic ranking tools don't measure citations. We set up a fixed set of questions your audience would ask, run them monthly in ChatGPT, Perplexity and Google AI Overviews, and report whether you are mentioned, in what context, and who gets mentioned instead of you.

That reporting gives you more than a score. When a competitor does get mentioned and you don't, we can trace it back to the cause: missing entity data, content that isn't self-contained enough to cite, or a lack of brand mentions on other sites that would serve as confirmation. Based on that, we adjust priorities the following month, so the project doesn't stall after a one-off technical fix but becomes an ongoing process.

When this is relevant for your business

GEO is especially relevant when your audience orients itself with questions rather than ready-made brand names — think service providers, B2B companies and organisations with an explainable, knowledge-intensive product or service. Once a user asks a question in ChatGPT or Perplexity instead of scanning ten blue links, it's no longer just your Google position that determines whether you're found, but also whether your content is suitable to be cited as a source.

That doesn't mean classic SEO becomes redundant. The two work together: SEO ensures you're findable in the search engine people still use daily, GEO ensures you're also included in the growing share of queries handled by an AI system. For businesses that want to know where they stand today, a crawlability audit is often the most concrete first step: it shows within days whether AI crawlers can read your site, before a single word of content has been rewritten.

If you want to know more about how we tackle the technical foundation, our page on SEO in Belgium covers the work that precedes GEO: technical health, structure and authority. Businesses that also want short-term results alongside organic visibility often combine this with Google Ads, which keeps you visible while the GEO project builds up. Questions about your situation are answered fastest via getting in touch.

Frequently asked questions about GEO