PromptMarketing: Engineering AI Search Visibility

About us

We are a GEO marketing agency and consultancy, focused on Generative Engine Optimization and visibility in ChatGPT, Gemini, Claude, Copilot and Perplexity. In a world of zero-click and answer engines, we help companies optimise across technology, content and authority. We also set up and optimise ChatGPT Ads.

Based at the AI AM Hub in Amsterdam. Founded in 2025 by Arjan ter Huurne after twenty years in search marketing on the agency side. OpenAI Select Partner since September 2026.

What we do

AI Visibility: measure how AI sees your brand

We sample ChatGPT, Gemini, Claude, Copilot and Perplexity on the prompts your buyers actually ask and report how often you are named, how you are described and which sources the models rely on. This is the baseline everything else builds on.AI Visibility

GEO: technology, content and authority

Generative Engine Optimization is the work that gets a brand retrieved, understood and recommended by AI models. Can AI crawlers read your pages, is there one clear answer per topic, and do sources the models trust confirm your story? We do all three, in that order.Generative Engine Optimization

ChatGPT Ads: setup and optimisation

Since the Dutch launch we have been running our own campaigns and our clients' in the ChatGPT Ads Manager: account structure, creative for an AI conversation, OpenAI Pixel and Conversions API, and continuous optimisation. We publish our benchmarks and teach the Emerce Academy and Beeckestijn courses.ChatGPT Ads

Who we work for

Brands that have noticed the old way of being found no longer works. Most arrive with one of these three situations.

Organic traffic is falling and nobody knows whether AI is the cause

Rankings still hold, but the clicks disappear into AI Overviews and chatbots. We first measure what AI says about you and where you are missing, and only then what to change.

ChatGPT names the competitor, not you

The models get their answer from somewhere. We find out where, why you are not in it, and which of the three layers (technology, content, authority) is causing it.

You want to advertise in ChatGPT, but there is no playbook yet

The platform is a month old and changes weekly. Our campaigns are already running; we take over the setup, the measurement and the learning budget.

How we work

Measure, engineer, prove. No hacks, no promises a model cannot keep.

Measure first, optimise second

Every engagement starts with a prompt-level baseline. Without it you cannot tell whether a change worked, and we do not claim anything we cannot show.

Technology, content and authority together

AI visibility is not a content trick and not a technical checklist. It is the interplay of machine access, clear answers on your pages and confirmation by sources the models trust. We work on all three.

Probabilistic, so measured repeatedly

An AI model gives a different answer on every run. We therefore report rates across many runs, not screenshots. Less spectacular, far more honest.

Built to survive model updates

We build foundations that keep working when OpenAI or Google changes something tomorrow: clear entities, verifiable data and sources beyond your own site. Quick wins that create technical debt we skip.

Cases

How we work in practice, with the numbers and the measurement window. The first case covers ChatGPT Ads for three webshops in four countries.

View our cases

In the press

Where PromptMarketing and our work on AI search visibility and ChatGPT Ads have been covered or published.

OpenAI Select Partner badge

OpenAI Select Partner

In September 2026 PromptMarketing was named an OpenAI Select Partner in the OpenAI Partner Network, OpenAI's global programme for organisations that build, sell and deliver AI solutions with OpenAI. For our clients it means the team that runs their ChatGPT Ads and GEO programmes works with enablement, documentation and support from OpenAI itself, next to what we learn from our own live campaigns.

Read what the status means

Our Partners

AI.AM

Our office space is the AI.AM Hub in Amsterdam - breeding ground for AI startups. All our processes & workflows are AI powered.

Promptwatch

Deep partnership with this leading AI Visibility tool. We get founder-level support and give feedback on product roadmap.

Everywhere Network

International agency network of 11 top agencies across Europe and the USA: more than 2,000 specialists, 20 offices and over EUR 1.5 billion in annual managed media. Arjan is President of the network; PromptMarketing is its innovation hub for AI search.

Google

Instrumental company throughout Arjan's career. We've built strong relationships in many parts of the Google org.

Emerce Academy & Beeckestijn

Arjan is the ChatGPT Ads trainer for both institutes: the one-hour introductions and the three-hour deep dive for Dutch marketers.

Team of specialist consultants

We're a collective of deep experts. No generalists. No gurus. Just people who know their craft, are eager to explore, learn and dive deep.

Arjan ter Huurne

Arjan ter Huurne

Founder

Arjan ter Huurne

Founder

Founder of PromptMarketing, Europe's first consultancy dedicated to visibility in AI search, and President of the Everywhere Network: 11 agencies across Europe and the USA, more than 2,000 specialists and over EUR 1.5 billion in annual managed media. Five years at Google, then fifteen years at Abovo Maxlead as head of paid media (EUR 100 million in annual digital ad spend), innovation lead and Chief Growth Officer for the entire group (EUR 250 million in total managed media). Over twenty years in search marketing. Arjan runs ChatGPT Ads campaigns for clients in the United States and Europe, launched the European ChatGPT Ad Library, and is the ChatGPT Ads trainer for Emerce Academy and Beeckestijn Business School. Known for a practical approach: what works today and how you measure it. Speaking, press and full bio: arjanterhuurne.com.

Erik Jan Reijenga

Erik Jan Reijenga

Business Consultant

Erik Jan Reijenga

Business Consultant

Agency COO & CEO exp; bridges the gap between technical AI engineering and enterprise growth strategies.

Roland Ketle

Roland Ketle

AI Search Consultant

Roland Ketle

AI Search Consultant

Roland is a search marketeer specialising in organic search with 15 years of experience working on digital marketing projects with both local and global scope.

Felix Koole

Felix Koole

LLM Visibility Engineer

Felix Koole

LLM Visibility Engineer

Felix works at the intersection of SEO and AI systems, which turns out to be exactly where the interesting problems are right now. He spent five years building websites and running SEO as a freelancer before AI search started reshaping the field. That background gives him something most AI researchers don't have: a grounded sense of how visibility actually works in practice, and why the shift to generative answers changes everything for brands. He holds a BSc in Artificial Intelligence from Utrecht University and is currently completing a Research Master in AI. He's deep into how LLMs and embeddings work at an architectural level: how they encode meaning, what they pay attention to, and why certain content gets retrieved and cited while other content doesn't. That architectural understanding lets him build hypotheses from first principles and design experiments that actually test the right things. At PromptMarketing he helps brands get cited and surfaced by AI systems, translating that technical depth into concrete strategy, backed by controlled experiments and real data.

Fleur Steenbrink

Fleur Steenbrink

GEO / Content

Fleur Steenbrink

GEO / Content

10 years SEO experience; specialist in AEO/GEO content strategies and semantic HTML foundations.

Ramon Gulikers

Ramon Gulikers

GEO / Technical

Ramon Gulikers

GEO / Technical

13 years SEO experience; expert in technical SXO audits and off-page authority building.

Wouter van der Meij

Wouter van der Meij

GEO / Technical

Wouter van der Meij

GEO / Technical

16 years SEO experience; specialist in optimizing site architecture and EEAT signals for machine trust.

Thomas Huijsmans

Thomas Huijsmans

AI Developer

Thomas Huijsmans

AI Developer

AI Developer building websites and applications with Next.js and Astro. Experienced with AI integrations.

Bart Kalisvaart

Bart Kalisvaart

AI Developer

Bart Kalisvaart

AI Developer

15 years dev experience; expert in AI workflows, agents, and platform integrations like ACP and MCP.

What We Believe

Measurement Over Opinion

If we can't measure it, we don't claim it. Every technical action is tied to an observable shift in AI visibility metrics.

Transparency By Default

We show our work. Clients see the methodology, the risks, the reasoning. No black boxes, no proprietary "magic."

Long-Term Thinking

Quick wins that create technical debt aren't wins. We build architecture that serves brands for years, not quarters.

Honest Limitations

We'll tell you when something is outside our expertise or when your expectations exceed what's possible. Trust requires honesty.

Curious how AI describes your brand today?

We start with a baseline across nine AI engines. After that you know exactly where you stand and what to do first.

Request your baseline

Ready to become machine-readable?

Contact us to learn how we engineer AI search visibility for your brand.