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The Future of Marketing is Here

AI SEO is the future of how customers will search.

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A phone showing an AI assistant recommending a Castle client.
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  • Winner, Best Search Agency 2023
  • Winner, Best Search Agency 2024
  • Winner, Best Search Agency 2025
  • Winner, Best Search Agency 2026

We make you visible and recommended.

A Multi-Award Winning Marketing Agency.

Castle was founded in 2014 and has been committed to running an agency with all the ethics and good practices that have enabled us to work with some of the world’s biggest brands. Castle specialises in growing businesses commercially and helping AI recognise and recommend our clients.

We have built the foundations of our service on impeccable communication, tireless effort, and empowering our team to think critically.

In this new era of AI, Castle are leading the way in GEO, AEO and AI SEO as well as being at the forefront of ChatGPT, Meta, TikTok and Google Advertising.

Our expertise

Five disciplines, run as one retainer.

Lead
Generation

Qualified enquiries, not vanity metrics.

  • Paid search & paid social
  • Landing pages built to convert
  • Call and form tracking
  • Cost per booked job
  • CRM integration
Learn more

E-commerce
Marketing

Growth in sessions that shows up in revenue.

  • Google, Meta & TikTok
  • Feed and shopping optimisation
  • Email and retention flows
  • Lifetime value modelling
  • Monthly revenue reporting
Learn more

AI
SEO

Named by the assistant, not buried on page two.

  • AI visibility and citation audits
  • Answer-first content and schema
  • Entity and authority building
  • GEO and AEO programmes
  • Citation share reporting
Learn more

Shopify
Development

Storefronts built to load fast and convert.

  • Shopify Plus builds
  • Custom theme development
  • App and API integrations
  • Core Web Vitals tuning
  • Certified Shopify Partner
Learn more

ChatGPT
Ads

The newest ad surface, run by people already on it.

  • Context and intent targeting
  • Sponsored placements in answers
  • Creative built for conversation
  • Incrementality testing
  • First-mover positioning
Learn more

Trusted by

Some of the brands we work with.

  • Procter & Gamble
  • Pfizer
  • Gillette
  • Oral-B
  • Hilton
  • Porsche
  • Chemist4U
  • boohoo
  • Graham
  • Flight Centre
  • Cudos
  • Liverpool Women’s Hospital Charity
  • NHS
  • B&Q

AI search

The world of search is changing.

Answer Engine Optimisation

AEO is a marketing service that helps businesses grow through the use of citations and answers to questions, forming trust with new customers as an expert.

Generative Engine Optimisation

GEO is the new SEO, helping AI chatbots such as ChatGPT, Claude and Gemini recommend your business by building a digital infrastructure they trust and understand.

AI Search Engine Optimisation

AI SEO is the same as GEO & AEO, it is just a clear and easy term for businesses to understand, but many traditional SEO practices still remain.

Questions

Frequently Asked Questions

You send as much work as you like and we prioritise it together each week. There is no ticket allowance and no per-request billing, so the only thing that limits output is how fast we can agree what matters most.

Onboarding usually takes a week. That covers access, analytics, a look at what is already running and an agreed list of the first month’s priorities. Work begins the week after.

No. It is a rolling monthly agreement you can end at the close of any month. We would rather keep the account by earning it than by holding you to twelve months.

Traditional SEO earns a position on a results page. AI SEO earns a mention inside the answer an assistant gives, which means structuring information so it can be quoted, cited and trusted rather than simply crawled.

Google and Bing as standard, plus ChatGPT, Claude, Gemini and Perplexity. The work overlaps, but each surface weighs sources differently and we track visibility on all of them.

Generative Engine Optimisation is the practice of shaping how AI systems describe and recommend a business when they generate an answer. Where SEO competes for a position in a list of links, GEO works on the material a model draws from — how a brand is defined, compared and corroborated across the web — so the description it produces is accurate and favourable.

Answer Engine Optimisation is the practice of structuring content so it can be lifted directly into an answer and attributed to you. That means self-contained passages that resolve a specific question, clean schema markup, unambiguous facts an engine can verify, and the off-site corroboration that makes a system comfortable naming you as the source.

They describe overlapping work at different depths. AEO is about being the quoted answer to a question. GEO is about how a model characterises your brand when it writes about you. AI SEO is the umbrella term for both, plus the traditional technical and content foundations underneath, and it is the phrase most businesses find easiest to use.

Assistants recommend businesses they can identify confidently and verify independently. In practice that means a consistent entity across your site, your listings and third-party sources; content that answers the questions buyers actually ask; and enough credible mentions elsewhere that the model is not relying on your own marketing alone. There is no placement to buy — recommendation is earned through the source material.

Yes. Most assistants retrieve from pages that already rank, and Google’s AI Overviews lean heavily on established organic results. Technical health, crawlability, site architecture and genuine authority remain prerequisites, which is why we run AI SEO and traditional SEO as one programme rather than two competing projects.

Early signals such as new citations and brand mentions inside AI answers typically appear within four to eight weeks. Meaningful, compounding visibility usually builds over three to six months, because it depends on both on-site changes and the slower accumulation of off-site corroboration.

We track how often each assistant cites you, which competitors it groups you with, what it says about you, and the share of relevant prompts where you appear at all. Because platforms retrieve and attribute differently, we measure per platform — a citation in Perplexity is no guarantee of one in ChatGPT.

Yes, and often faster than for national brands. Local queries have fewer credible sources competing for them, so consistent business information, genuinely useful location and service pages, and reviews an engine can read will frequently make a smaller business the obvious thing to recommend in its area.

Yes. We are based on Mann Island and a good share of the team is here most days, but our clients are spread across the UK and we run accounts remotely without any drop in pace.

A monthly report tied to the number that matters to you, whether that is booked jobs, revenue or qualified enquiries, plus a live dashboard you can open whenever you want to check.

Inside Castle

The people who will be on your account.

Based in Liverpool, our team work with clients across the UK, US and Europe, specialising in AI search engine optimisation, ChatGPT advertising, paid media across Meta, TikTok and Google, as well as AI Consulting and Shopify Development.

  • Castle strategist presenting in the boardroom
  • Castle team members at work in the studio
  • Two members of the Castle team at their desks
  • Castle team collaborating over a screen
  • A Castle strategist in a client meeting
  • Forbes Business Council, 2022 Official Member
  • Meta Business Partner
  • Google Partner
  • Google Reviews
  • Trustpilot
  • EU GDPR compliant

Our team

Speak to one of our team.

Tell us what growth needs to look like this year. We'll tell you what it takes to get there.

Studio
17 Mann Island, Liverpool L3 1BP
Telephone
0151 372 1234