AI search library°

Generative engine optimisation, answered plainly

GEO, AEO, LLM SEO, AI visibility. The category settled on a vocabulary before it settled on definitions, so the same words are used to mean different things by different vendors. These are our answers, with the working shown and the sources named.

16 answers. Every one states its answer in the first forty words, so you can leave immediately if that is all you needed.

A growth team working through AI search definitions and methods
Definitions

What the words mean

The category settled on a vocabulary before it settled on definitions, so the same term is used to mean different things by different vendors. These are ours, written to be argued with.

How-to

How the work is done

Methods you can run yourself, including the manual checks that are worth doing before you buy any tooling.

Decision

What to buy, and whether to buy anything

Budget, cost, resourcing and supplier selection. Each of these has a version of "you may not need this yet", because a decision page with one possible conclusion is a sales page.

Does GEO need its own budget, separate from SEO?

Partly. Most GEO work is technical and content work your SEO budget already funds. Two lines have no SEO equivalent and need separate funding: the off-site citation-sources programme, and AI visibility measurement.

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What does generative engine optimisation cost?

Across the market in 2026: AI visibility tooling runs roughly £200 to £2,000 a month, freelance GEO £2,000 to £6,000, agency retainers £4,000 to £15,000, senior advisory £8,000 to £35,000. An in-house hire is £60,000 to £95,000.

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AI search: advisory, agency or in-house?

Hire in-house if AI search is permanent and full-time. Use an agency if you need execution capacity. Use an advisory if you have a capable team but no senior judgement here. Many companies need none of the three yet.

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How to brief and evaluate a GEO partner

Brief on the outcome and the constraint, not the tactics: what you want to be found for, which competitors you lose to, and what you will not do. Then evaluate on nine technical questions with known answers.

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How to report AI search visibility to a board

Report four things: share of voice against a fixed competitor set, brand accuracy, source concentration, and citation rate per platform. Never a blended score, modelled traffic shown as measured, or a projection.

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Looking for a GEO agency or an AI SEO agency?

An agency does the work and is paid for output. An advisory sets direction and is paid for judgement, with your team executing. Capacity but no direction means you want an advisory. Direction but no hands means an agency.

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The parts of this we publish rather than sell

Our measurement definitions, a full worked audit, the public index and our position on llms.txt. Free, and useful whether or not you ever speak to us.