AEO vs SEO — Optimising for AI Answers vs Search Rankings
SEO optimises for a ranked list of blue links a human clicks. AEO optimises for a synthesised answer an AI speaks, where there are no rankings — only whether you're cited or not. The skills overlap; the goal does not.
Porsync · Updated 2026-05-31
The one-line answer
SEO (Search Engine Optimisation) optimises for **position in a ranked list** — getting your page higher in Google's ten blue links so a human clicks it. AEO (Answer Engine Optimisation) optimises for **inclusion in a synthesised answer** — getting ChatGPT, Perplexity, Claude, or Gemini to cite you when they answer a question directly, with no list and no click. SEO competes for a rank; AEO competes for a citation.
Side by side
| SEO | AEO | |
|---|---|---|
| Optimises for | Rank position in a results page | Being cited inside a generated answer |
| Surface | Google / Bing results pages | ChatGPT, Perplexity, Claude, Gemini answers |
| Unit of success | A click-through | A mention / citation |
| Result shape | Ten ranked links | One synthesised answer, few or no links |
| Key signals | Backlinks, keywords, page speed, dwell time | Entity clarity, structured data, factual consistency, llms.txt, crawler access |
| "Position zero" | Featured snippet | The entire answer *is* position zero |
What carries over and what doesn't
The foundations overlap: clean semantic HTML, fast pages, structured headings, and schema markup help both. Technical hygiene is shared ground.
What changes is the target. SEO rewards relative ranking among competitors; AEO is closer to **binary** — the AI either includes you in its answer or it doesn't, and there's rarely a visible "second place." That shifts the work from keyword positioning toward **entity recognition and factual consistency**: the AI has to know *who you are*, trust that knowledge, and find your facts stated the same way everywhere it looks. Contradictory or thin information doesn't rank you lower — it gets you omitted.
AEO also adds artifacts SEO never needed: `llms.txt` (a machine-readable site summary for LLMs), an explicit AI-crawler allowlist in `robots.txt` (GPTBot, ClaudeBot, PerplexityBot, and others), and dense Q&A / FAQ content shaped the way an answer engine quotes.
You don't replace SEO — you extend it
This isn't a migration. Human search isn't disappearing, and the technical base of good SEO is the launchpad for AEO. The shift is that a growing share of buyers ask an AI instead of scrolling a results page — and in that channel, ranking #3 is worth nothing if the AI's answer never mentions you. AEO is the layer that makes you part of the answer itself.
For the agentic layer beyond citation — letting an AI agent actually *act* on your site — see AEO vs WebMCP.
How Porsync approaches it
Porsync's AI Visibility Engine treats AEO as a bottleneck to remove, not a checklist: audit how the major engines currently represent a business, fix the citation and selection signals (schema, llms.txt, entity consistency, FAQ), and verify the change by re-querying the engines. The technical SEO foundation is assumed; the work is making a business citable on top of it.