SEO vs AEO vs GEO: What’s the Difference and Which Does Your Business Need?

SEO, AEO and GEO compared: where each shows up, what Google says about them, and what answer engine optimization services should include.

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SEO gets you into search results, AEO into direct answers and GEO into AI-written responses, and most small businesses should fix their SEO before paying for answer engine optimization services. For Google’s own results, Google says all three are the same work.

What is the difference between SEO, AEO and GEO?

SEO, AEO and GEO differ mainly in where the result appears: a ranked list, a single direct answer, or a response an AI system writes from several sources. Google’s guide spells out the acronyms as answer engine optimization and generative engine optimization, and says people use both for work aimed at visibility in AI search. On sales pages the two often describe the same package, so ask what the work is before you compare prices.

GEO has an academic start. A 2023 paper by Pranjal Aggarwal and colleagues introduced the term and reported visibility gains of up to 40% on the authors’ own benchmark. That’s a test-set result, and it tells a plumber in Ohio very little about what to expect.

Where each one shows up

SEO, AEO and GEO aim at different screens and share most of their groundwork

The middle, shared by all three

Pages that can be crawled, say plainly what you do, and give people a reason to trust you

The outer edge of 2 and 3

Access for AI crawlers such as OAI-SearchBot, and your listings on the outside sites those systems read.

  • 1

    SEO

    Search engine optimization

    Ranked results and map listings on Google and Bing.

    The prize: a click from the results page.

  • 2

    AEO

    Answer engine optimization

    One direct answer at the top of a search, or read aloud by an assistant.

    The prize: being the source of that answer, sometimes with no click.

  • 3

    GEO

    Generative engine optimization

    Responses written by ChatGPT, Perplexity and Google’s AI Mode.

    The prize: a mention or a source link inside the written response.

Vendors draw these lines differently, so the drawing is a rough map. For its own results, Google treats all of it as SEO.

What does Google say about AEO and GEO?

Google calls this work SEO. Its AI optimization guide, last updated July 10, 2026, says “optimizing for generative AI search is optimizing for the search experience, and thus still SEO.” The advice that follows is familiar: “Continue prioritizing foundational SEO best practices” and “Focus on developing unique, expert-led content that provides value beyond common knowledge.”

The same guide rejects two popular tactics. “You don’t need to create new machine readable files, AI text files, markup, or Markdown to appear in Google Search,” it says, and “There’s no requirement to break your content into tiny pieces for AI to better understand it.” Google’s page on AI features adds that there are “no additional requirements to appear in AI Overviews or AI Mode,” and also warns, “Indexing and serving isn’t guaranteed.”

If a package aimed at Google is built around llms.txt files and chopped-up paragraphs, read those lines before you pay for it. Google has its own interests, of course, and it only speaks for Google.

What changes for AI search visibility outside Google?

AI search visibility outside Google depends on separate crawlers and sources, and that’s the one part of this field that counts as extra work. OpenAI says “Sites that are opted out of OAI-SearchBot will not be shown in ChatGPT search answers.” Perplexity says its crawler, PerplexityBot, “is designed to surface and link websites in search results on Perplexity.” A site can rank on Google while blocking both, sometimes without its owner knowing, through robots.txt or a firewall setting.

Outside sites count as well. BrightLocal, which sells local SEO software and an AI visibility tracker, looked at more than 1.9 million citations for local businesses across AI Overviews, AI Mode and ChatGPT. Yelp appeared in 80% of the ChatGPT answers it checked, and Google Business Profile wasn’t a top ChatGPT source. Our guide to getting your business found on ChatGPT goes through what to do with that.

What should answer engine optimization services include?

Answer engine optimization services and generative engine optimization services should include work you can check, on your own site and on your outside listings. Ask for these in writing:

  • A check that OAI-SearchBot and PerplexityBot can reach your pages
  • Service and location pages that answer the question in their first sentence
  • The same business details on your site and your outside listings
  • Author and business information a reader can verify
  • A fixed list of test questions, rerun on a schedule
  • A plain report of what changed and what didn’t

Most of that list is ordinary SEO, and a good provider will say so. Our AI search optimization work covers the access and listing checks, and our SEO services cover the pages and the local signals underneath them. If crawling or indexing is broken, begin with a technical SEO audit, since a page that can’t be read won’t be used by anyone. We price this work as a fixed quote after reviewing your existing setup, and we don’t promise rankings or citations. Google says “No one can guarantee a #1 ranking on Google,” and we don’t control what an AI system writes either.

Which one does your business need?

Almost every small business needs SEO first, and the AI-specific work only makes sense after you can name a gap.

Which of SEO, AEO and GEO to start with, by situation
Your situationStart withWhy
Local service business, weak on GoogleSEO and local SEOGoogle says local results are “mainly based on relevance, distance, and popularity.”
New site, or pages not indexedTechnical SEOPages have to be found before anything else can work.
Good rankings, absent from ChatGPTGEO-style checksCrawler access and outside listings are the likely gaps.
Customers compare options at lengthSEO plus answer-first contentGoogle says AI Mode suits queries needing “further exploration, reasoning, or complex comparisons.”

We’d put SEO first because the same work also gets you into Google’s AI features: its documentation says a page must be indexed and eligible to appear with a snippet to be a supporting link there. For a budget, see what small business SEO costs. If you’re replacing the site anyway, a website design and SEO package lets you build these basics in from the start.

How do you measure AI search visibility?

You measure AI search visibility by asking the same questions on a schedule. Write down what a customer would ask, run those questions in ChatGPT, Perplexity and Google’s AI Mode each month, and note whether you’re mentioned, whether you’re linked, and who appears in your place.

Treat the results as a rough trend. Answers can vary by location, which is why BrightLocal ran each prompt at nine map points per business. Your own data is firmer: visits from OAI-SearchBot in your server logs tell you the crawler can reach you, and referrals from chatgpt.com or perplexity.ai in your analytics show people arriving. Paid trackers exist and may save you time, though their makers have a stake in the topic seeming urgent.

Frequently asked questions

Is AEO the same as SEO?
For Google’s results, Google says yes: optimizing for generative AI search is “still SEO.” Other systems, such as ChatGPT and Perplexity, have their own crawlers and draw on their own mix of sources, so a small part of the work is separate.
Do I need generative engine optimization services?
Only if you can name a gap they’d close, such as ranking well on Google while AI tools can’t reach your site or never mention you. If your Google rankings are weak, start there, because Google’s AI features draw on pages it has already indexed.
Do I need an llms.txt file for AI search?
Not for Google. Google says you don’t need new machine readable files or AI text files to appear in Google Search. Other systems set their own rules, and we’d treat the file as optional and put it well behind crawler access and clear pages.
Can anyone guarantee my business will appear in AI answers?
No. Google says indexing and serving aren’t guaranteed even when a page meets its requirements, and no one outside these companies controls what their systems write. Be wary of any provider who promises citations.

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Sources

All pages checked November 1, 2026. BrightLocal sells local SEO software and an AI visibility tracker.