GEO vs SEO vs AEO: what's the difference, and where should you invest?
By Clement Wong · 29 June 2026 · 7 min read
The answer in one paragraph
SEO optimises for ranking positions on search results pages. AEO optimises for direct answer surfaces — Google AI Overviews, featured snippets and People Also Ask. GEO optimises for citations inside generative AI engines such as ChatGPT, Gemini, Perplexity and Claude. They share foundations (technical hygiene, structured data, authoritative content) but target different surfaces where buyers now discover businesses.
Three years ago, "being found online" meant one thing: ranking in Google. Today the same buying journey can run through a Google results page, an AI Overview above it, or a ChatGPT conversation that never touches Google at all. Each surface has its own optimisation discipline, and conflating them is how businesses end up invisible on the surfaces that are growing fastest.
The three disciplines, side by side
| SEO | AEO | GEO | |
|---|---|---|---|
| Optimises for | Ranking positions on results pages | Answer surfaces: AI Overviews, featured snippets, People Also Ask | Citations and recommendations inside AI engines |
| Where it wins | Google, Bing results pages | The answer box above the rankings | ChatGPT, Gemini, Perplexity, Claude |
| Core levers | Technical health, on-page optimisation, content, links | Question-format headings, 40–60 word answer capsules, FAQ schema | Entity schema, llms.txt, citable content, corroboration across the web |
| Measured by | Rankings, organic traffic | Answer-position share for target queries | Citation share in AI engine responses |
Why they're not interchangeable
A site can hold position one in Google and be invisible to ChatGPT users asking the same question — we see this constantly in audits, where most sites score 0–2 out of 10 on GEO readiness despite respectable classic SEO. The reverse also holds: a beautifully structured, schema-rich site with thin authority won't outrank established competitors on results pages. Each discipline has levers the others don't touch.
Where the overlap works for you
The good news: roughly half the work feeds all three. Clean technical structure, fast pages, clear information architecture, authoritative content and consistent entity data are the shared foundation. What sits on top differs — answer capsules and FAQ schema for AEO, llms.txt and entity building for GEO, links and content depth for classic SEO. A combined programme sequences the shared foundation once, then layers the surface-specific work.
How to decide where to invest first
- Broken technical SEO? Fix that first — it throttles everything downstream.
- Sound SEO, zero AI citations? GEO foundations are the fastest gap to close: schema, llms.txt and entity signals typically go live within 2–4 weeks.
- Ranking well but losing clicks to AI Overviews? That's the AEO scenario: restructure your best-performing content into answer-ready formats and let it win the box that currently sits above you.
If you're unsure which scenario is yours, that's precisely what an audit is for — ours scores all ten categories, including GEO and AEO readiness, in 5–10 business days.
GEO vs SEO vs AEO: common questions
Do I still need SEO if I invest in GEO and AEO?
Yes. SEO remains the foundation: clean technical structure, authoritative content and crawlability feed all three disciplines. GEO and AEO build on those foundations to win AI citations and answer positions — they extend SEO rather than replace it.
Which should a business invest in first: SEO, GEO or AEO?
Audit first, then decide. If your technical SEO is broken, nothing downstream works. If your SEO is sound but AI engines never cite you, GEO foundations (schema, llms.txt, entity signals) are the fastest gap to close. If you rank on page one but lose clicks to AI Overviews, AEO targets exactly that.
Can one agency or programme cover all three?
Yes, and it is usually more efficient, because the three disciplines share an infrastructure of structured data, content architecture and technical hygiene. i12ai scores all three in a single audit and runs combined programmes.
Find out which surfaces you're missing
One audit scores your SEO, GEO and AEO readiness with a prioritised action plan.