The short answer
SEO, GEO and AEO differ in what they aim at, not in what they rest on. SEO gets your page into a list of results and clicked. GEO gets an AI system to use your content in its answer and name you. AEO is the older name for the same work, from the days of voice assistants and featured snippets. All three stand on one foundation: reachable pages, clear structure, verifiable claims. If your SEO is sound, most of the GEO work is already done.
Almost every article on this subject sells the change as a replacement — the old thing dying, the new thing arriving. That story is convenient and it misleads. It sells consulting; it does not describe what happens in practice.
What actually happens fits in one sentence. A second reader has placed itself between your page and your customer. It reads your text before the human does, and it decides whether to pass it on. Everything else follows from that.
- SEO — search engine optimisation. Getting a page as high as possible in a classic list of results, and clicked.
- GEO — generative engine optimisation. Getting generative systems to use your content in their answer and name your brand as a source.
- AEO — answer engine optimisation. The older term for the same goal, coined when voice assistants and featured snippets were the main non-link formats. In day-to-day work it is a synonym for GEO.
- Not meant here: geotargeting or local search. The abbreviation GEO carries both meanings, and only one of them is this one.
SEO, GEO and AEO side by side
This comparison is the core of the article. It shows not only what differs, but also where the difference is small enough that it should not occupy anybody.
| Criterion | SEO | GEO and AEO |
|---|---|---|
| Goal | A slot in a list of results | A mention, ideally linked, inside a written answer |
| Competing for | Ten places on a page | Three to eight sources inside one paragraph |
| Unit of optimisation | The page, aimed at a query | The individual section, aimed at a question |
| Strongest signal | Links from other sites | The same statement about you in several independent places |
| Role of the title | Decides the click | Decides whether the section is read at all |
| Evidence in the text | Useful for trust | Necessary — unsupported claims are picked up less often |
| Speed of effect | Slow, over months | Faster, because sources are refetched more often |
| Core metric | Position, clicks, click-through rate | Mention rate, citation rate, referral traffic |
| Where you measure | Search Console, rank tracking | Your own prompt log, analytics, Bing Webmaster Tools |
| Typical mistake | Chasing terms owned by strong domains | Optimising for reach without ever reading the answer |
| What carries over | Crawlability, load time, clean headings, structured data, topical depth — identical for both | |
The three real differences
Of the many differences these comparisons list, three survive scrutiny. The rest are restatements of the same idea.
You compete for paragraphs, not positions
A results page has ten organic slots. An AI answer has three to eight sources, and they are not stacked — they are scattered through the text. There is no position two. Either your statement is in the paragraph or it is not.
In practice this moves the unit of optimisation from the page to the section. An article that answers ten questions in ten clearly separated blocks has ten chances. An article that blends the same ten questions into flowing prose has one.
Agreement matters more than authority
In classic SEO a link from a strong site is a strong signal. Generative systems weigh something else: whether the same statement about you appears in several independent places. A model that finds three sources confirming your figure will use it. A model that finds one will hedge or drop it.
That shifts the work from acquiring links to keeping claims consistent. If your website, your directory listing and a trade article describe your offering three different ways, the model has no settled picture of you — and mentions you less.
Success no longer reduces to one number
SEO has a position. It is uncomfortable but unambiguous. GEO has none, because every answer is generated fresh and shifts with the phrasing of the question. Two people asking the same thing get different sources.
So you measure in shares rather than ranks: in how many of twenty questions do you appear. That is more work and less satisfying than a rank tracker — and it is the only measurement that matches the thing being measured.
Do you know how AI systems describe your brand right now?
We ask the questions your customers ask across ChatGPT, Gemini, Perplexity and Copilot, then show you in writing where you are named, where your competitors stand, and which gap is keeping you out of the answer. The first conversation is free.
Book a free intro callWhere all three want the same thing
This section is missing from almost every comparison, because it spoils the succession story. It is nonetheless the most useful one, since it tells you what you do not have to redo.
All three need the same base. Your pages must be reachable by crawlers, or you do not exist for any of these systems. They must load quickly, because abandoned fetches are not evaluated. They need a clean heading structure, because both kinds of system use it to work out what a section is about. They benefit from structured data, because machine-readable facts reduce uncertainty in both cases.
And all three reward topical depth. A domain that covers a subject thoroughly is treated as an authority by classic search and pulled in more often by generative systems. That is not a coincidence; it follows from the same principle. Cover a subject completely and you have a fitting answer for more questions.
The practical consequence: if your SEO is in order, GEO does not start at zero. It starts at roughly seventy percent. What is missing is structure at the section level, provability of claims, and a measurement that did not exist before. Anyone telling you to start over is selling you a project.
Four AI systems, four behaviours
The largest blind spot in most comparisons: they treat "AI search" as one thing. It is not. The four systems that matter differ in how generously they name sources and how many clicks can result at all. The same optimisation therefore produces very different outcomes depending on which system your audience uses.
| System | How it handles sources | What that means for you |
|---|---|---|
| Google AI Overviews and AI Mode | Sources appear as links beside or below the answer; the answer itself takes the foreground | A mention is valuable for awareness but leads to a click less often. The click-through rate of the organic results below drops. |
| ChatGPT Search | Names sources more sparingly and summarises more heavily | Few but prominent mentions. One mention here carries more weight than elsewhere. |
| Perplexity | Shows sources prominently and numbers them in the text | The system where a mention is most likely to turn into an actual visit. |
| Microsoft Copilot | Draws on the Bing index and links regularly | If you are not discoverable in Bing you do not appear here, whatever your Google position. |
An uncomfortable but important conclusion follows: a high mention rate is not yet a business outcome. Being named mostly in AI Overviews earns recognition and little traffic. Being named in Perplexity earns both. Before you justify GEO spend, find out which system your customers actually use.
Measuring it: metrics and where to read them
This is where most comparisons stop. They explain that measurement has to change and never say how. That is the real gap, because without measurement GEO is an assertion.
The three metrics
- Mention rate. Put twenty questions your customers genuinely ask to every relevant system. Count how many answers name your brand. That ratio is your mention rate, and everything else builds on it.
- Citation rate. Of the answers that name you, how many also link to you. The gap between mention rate and citation rate tells you whether you are known as a brand or used as a source. Both are worth having; only the second brings visitors.
- Referral traffic from AI systems. Readable in your analytics under the source domains. The number is small and grows slowly, but it is the only one denominated in actual people.
Where the numbers live
| What you want to know | Where it lives | Limitation |
|---|---|---|
| Mention and citation rate | Your own prompt log: the same questions, a fixed cadence, answers recorded | Has to be collected by hand. No tool delivers it without your list of questions. |
| Visits from AI systems | Analytics, referral sources filtered by domain | Some visits arrive without a referrer and are missing from this figure. |
| Clicks from Google search including AI Overviews | Google Search Console, performance report | AI Overviews are not broken out; they are folded into web search. |
| Visibility in the Copilot surface | Bing Webmaster Tools, search performance | Covers the Bing index only — but with data Google does not have. |
| Reachability for AI crawlers | Server logs and your own robots.txt | A blocked crawler is the most common silent cause of invisibility. |
The one sentence to take from this section: the mention rate has to be collected by you. There is no report to open. There is a list of questions you decide on and a cadence at which you ask them. Skip that step and you are optimising blind.
What GEO costs and how long it takes
Two questions comparisons almost never answer, although both shape every decision.
On effort. The total is in the same range as sound SEO; it is distributed differently. Less flows into acquiring links, more into three things: the structure of individual sections, the provability of claims, and continuous measurement. If you already run decent SEO, the third is what you are adding — and it is the item most people underestimate, because it never finishes.
On duration. Here there is a genuine difference from SEO, and for once it runs in your favour. Structural changes to a page can show up in AI answers within weeks, because these systems refetch their sources more often than a classic ranking moves. What takes months is building consistent mentions on other people's sites. Put briefly: your own page moves quickly, your reputation across the web moves slowly.
GEO instead of SEO? Wrong question
"GEO instead of SEO" is one of the most common framings of this topic, and it contains the error already. It presumes a choice that does not exist.
Every current answer system falls back on a search index when it needs current information. These systems do not invent their sources, they look them up. Drop out of the index and you cannot be cited. The moment you abandon SEO you also abandon the foundation of your GEO.
So the question is not "instead" but "in addition, for what". And the answer depends on where your customers search. For an audience still searching mostly the classic way, GEO is insurance for the next few years. For an audience already putting questions to a language model, it is the channel where the decision is being made today.
Finding out which of the two describes you takes measurement, not opinion. The method is in the measurement section above. If the fundamentals of GEO are still new to you, start with the introduction to what generative engine optimisation is.
Frequently asked questions about SEO, GEO and AEO
SEO optimises for your page appearing in a list of results and being clicked. GEO optimises for an AI system using your content in its answer and naming you as the source. The difference is the goal, not the technique: a slot in a list versus a mention inside a paragraph. Both rest on the same foundation — reachable pages, clear structure, verifiable statements.
Very little in practice. AEO, answer engine optimisation, is the older term from the era of voice assistants and featured snippets. GEO is the newer term aimed at systems that write a full answer from several sources. Some practitioners use AEO for short direct answers and GEO for synthesised ones. The underlying work is the same, and arguing about the labels costs more time than it saves.
No. Every current AI answer system falls back on a search index when it needs current information. A page that drops out of that index cannot be cited. GEO is added to SEO; it does not take its place.
Rarely. These systems draw their evidence mostly from the top results. A page sitting at position 60 is seldom pulled in as a source. In thin niches an AI system will sometimes prefer a lower-ranked but unusually well-structured page. That is a happy accident, not a strategy.
Three numbers. Mention rate: in how many answers to your key questions does your brand appear. Citation rate: how often does that mention come with a link. Referral traffic from AI systems, visible in your analytics under the source domains. The first number has to be collected by hand — you fix a list of questions and ask them on a schedule.
Only partly. Clicks from AI Overviews are folded into ordinary web search and are not broken out. Clicks from ChatGPT, Perplexity or Copilot do not appear there at all; they show up in your analytics as referrals. Bing Webmaster Tools additionally reports citations in the Copilot surface that Google knows nothing about.
No, and this is the most frequently skipped point. Perplexity shows sources prominently and links generously. ChatGPT names sources more sparingly. Google AI Overviews keep users on the results page. The same optimisation therefore produces very different click volumes depending on which system your audience uses.
The effort is in the same range but distributed differently. Less goes into link building, more into content structure, evidence and continuous measurement. If your SEO is already sound, most of the work is done and what remains is structure and provability.
Structural changes to a page can surface in AI answers within weeks, because these systems refetch their sources more often than a classic ranking moves. Building consistent mentions on other people’s sites, which is what shapes a model’s picture of your brand, takes months.
It does no harm and replaces nothing. Such a file is a hint, not a rule, and no major system guarantees to honour it. What matters more is that your pages are reachable by the AI crawlers at all, and that your claims sit where a model will find them.
The bottom line
SEO, GEO and AEO are not rivals and not generations. They are goals sitting on one foundation. The foundation is reachable, fast, clearly structured and evidenced. On top of it, SEO asks: am I found. GEO and AEO ask: am I passed on.
If you are starting today, work in this order. First check that the AI crawlers are allowed on your pages at all. Then write down twenty real customer questions and record the systems' answers, so you have a baseline. Then rebuild your sections so each of those questions is answered in one clear place. Then ask the same questions again in four weeks.
That is unglamorous and it works. What does not work is rebuilding an entire website around an acronym before a single measurement exists.
We handle the measurement and the work
Our managed SEO and GEO service covers both ways people search today. You get the specific places — structure, evidence, citability — in the order in which fixing them pays, and we do the fixing. The first conversation is free.
Book a free intro call
