AEO vs SEO: What's the Difference?

SEO (Search Engine Optimisation) targets Google's blue-link results: keyword rankings, backlinks and click-through rates. AEO (Answer Engine Optimisation) targets AI-generated answers in ChatGPT, Perplexity, Gemini and Google AI Overviews: brand mentions, citation share and inclusion in synthesised responses. Most UK businesses now need both, but they reward different tactics and need separate measurement.

The one-line difference

SEO wins the click. AEO wins the answer that comes before the click. Increasingly, the answer is the whole interaction and there is no click.

Side-by-side comparison

  • Target: SEO targets Google's 10 blue links; AEO targets the AI-generated answer from ChatGPT, Perplexity, Gemini, Claude and Google AI Overviews.
  • Currency: SEO trades in keyword rank and traffic; AEO trades in brand mentions and citation share.
  • Content format: SEO rewards long-form, keyword-rich pages; AEO rewards clear direct-answer paragraphs, structured FAQs and well-scoped facts.
  • Authority signal: SEO weights backlinks heavily; AEO weights citation diversity across trusted sources and consistent entity data.
  • Measurement: SEO uses rank trackers and Search Console; AEO uses prompt-set testing across multiple engines.
  • Cadence of change: SEO moves on Google algorithm updates (months); AEO moves on model retraining and live retrieval (weeks).
  • Best for: SEO is best when buyers are ready to click; AEO is best when buyers are still researching and shortlisting.

What is the same

  • Both reward clear, well-structured content over keyword stuffing or thin pages
  • Both reward technical hygiene: fast pages, clean HTML, proper canonical tags, working schema
  • Both reward earned authority over manipulated signals
  • Both punish inconsistency in name, address, phone and entity data
  • Both benefit from a strong topical cluster rather than scattered one-off pages

Where they diverge in practice

Three concrete examples.

Content length. A 3,000-word SEO pillar may outperform shorter pages on Google. The same page underperforms in AEO unless it opens with a 40 to 60 word direct answer the engine can lift cleanly.

Backlinks. SEO rewards volume and domain authority. AEO rewards citation diversity: one mention on a respected trade publication plus a Wikipedia footnote plus a podcast appearance often beats 50 directory links.

Measurement. SEO success is measurable in Search Console within days. AEO success requires running a prompt set monthly across multiple engines and comparing month to month.

Should I do SEO or AEO first?

It depends on where your buyers actually search.

If your buyers still find you mainly through Google, SEO remains the priority and AEO is additive. If your buyers are increasingly starting in ChatGPT or Perplexity (common in B2B, professional services, software, consulting), AEO is now urgent and SEO alone leaves you invisible at the shortlist stage. Most UK businesses in 2026 sit in the middle and need both, with AEO catching up fast.

A UK example: same business, two pictures

A UK accident management firm ranked #4 on Google for their main commercial term: a solid SEO result. The same firm appeared in 0 of 24 ChatGPT prompts when buyers asked for recommendations: a worst-case AEO result. SEO was working; AEO was a blind spot. After 8 weeks of AEO work (direct-answer rewrites, FAQ schema, two earned guest articles, an llms.txt file) they appeared in 9 of the 24 prompts while their Google position held. The two disciplines compounded; neither replaced the other.

Frequently Asked Questions

Is AEO replacing SEO?

No. AEO is being added on top of SEO. Google blue links still drive substantial UK traffic. The difference is that AI answers now intercept buyers earlier in the journey, so SEO alone is no longer enough.

Will my SEO investment help my AEO?

Partly. Strong content and authority help both. But pure SEO tactics like keyword density and backlink volume do less for AEO than direct-answer formatting, schema and citation diversity.

Which is cheaper, SEO or AEO?

AEO is typically cheaper to get started because the highest-impact moves (direct-answer paragraphs, FAQ schema, llms.txt, three earned citations) are concentrated and fast. Mature SEO needs sustained investment.

Can the same content do both jobs?

Yes, with care. Open every important page with a clear direct-answer paragraph, support it with depth, add FAQ schema, and make sure the page is internally linked. That structure satisfies both Google and the AI engines.

How do I know if my AEO is working?

Run a fixed prompt set monthly across ChatGPT, Perplexity, Gemini and Google AI Overviews. Track mention rate, citation share and competitive share-of-voice. See our guide on measuring AI search visibility.

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