AEO vs SEO: what's the difference?
SEO (search engine optimization) tunes your pages to rank in the list of blue links. AEO (answer engine optimization) tunes your content to be the answer: the featured snippet, the voice result, the passage an AI assistant quotes. They are not 2 rival playbooks. Per Google's AI optimization guide, there is no separate framework for AI search, which means “the same fundamentals that rank you can also get you quoted.” Do the SEO, then make your best answers extractable.
Same foundation, different finish line
The confusion comes from treating AEO and SEO as opposites. They are not. They run on the exact same foundation, and neither one works if that foundation fails. Before either matters, the page has to be crawlable, indexable, fast, mobile-parity-intact, and readable without JavaScript, with helpful, people-first content. If a bot cannot reach the page or read it, it cannot rank it and it cannot quote it. Everything below sits on top of that shared floor.
What changes is the target. SEO aims at a position in a list. AEO aims at being the answer itself, often with no click at all. The work that gets you to each is mostly the same work, pointed at a different outcome.
What SEO optimizes
SEO works at the level of the whole page. You pick the query a page should win, write the page around that intent, and earn the links and authority that convince a search engine to rank you above everyone else competing for the same words. The unit is the page, and the win condition is a ranking position. The classic levers still apply:
- A page built around a real query and the intent behind it, not stuffed with keywords.
- Internal links and external links that signal the page is worth surfacing.
- Technical health: speed, indexability, clean URLs, mobile parity with desktop.
- Content that is genuinely the best result for the person who searched.
Success looks like a higher position in the list of links. A person still has to choose your result and click it. SEO gets you onto the page of results and as far up it as you can earn.
What AEO optimizes
AEO works at the level of the passage. Instead of optimizing a whole page to rank, you optimize specific answers so they can be extracted and quoted. An answer engine does not hand the visitor a list to browse. It reads the page, lifts the part that answers the question, and presents that. So AEO leans on the things that make a passage liftable:
- Clear, question-style headings that match how a person actually asks.
- Self-contained answers near the top, before any preamble, that stand on their own.
- Specifics: a number, a named entity, a date. Vague passages get skipped.
- Structured data that tells the engine what the entity and the answer are.
Success here is not a rank. It is being the answer, frequently with no click, because the engine showed your passage in place. That is the trade. You may lose the visit and still win the citation and the brand mention.
The honest punchline: it is not either/or
If you came here hoping for a clean fork in the road, there is not one. Google's official guidance is blunt about this: there is no separate framework for AI, and the same fundamentals apply. AEO is, for the most part, disciplined SEO aimed at the answer box. You cannot skip the SEO and jump straight to being quoted, because the engine that quotes you has to reach and read the page first. The order is simple. Do SEO first. Then make your strongest answers extractable: lead with the answer, write headings as questions, keep passages self-contained, and add structured data where it clarifies the entity.
This also means most of your effort serves both goals at once. A fast, crawlable, well-structured page that answers a real question clearly is the page that ranks and the page that gets quoted. You are not maintaining 2 separate strategies. You are doing the fundamentals well and then sharpening the parts an engine can lift.
What to ignore
There is a lot of folklore attached to both terms, so spend your time on the work that pays. There is no magic character count that makes a title or a meta description "AEO-ready," and no keyword density that unlocks rankings. An llms.txt file is not a requirement for either SEO or AEO. Google has said on the record it does not use it, so do not treat that file as a step you owe anyone. The signals that move the needle are the unglamorous ones: be reachable, be readable without JavaScript, be the most specific answer on the page, and let an engine extract it cleanly.
See where you stand on both
Brimm scores both halves at once. We check the ranking fundamentals, whether a crawler can reach you, whether your content survives without JavaScript, whether your pages are fast and indexable, and we check the answer-eligibility signals: whether your headings read like questions, whether your top passage is self-contained and specific, and whether your structured data is valid. We read your site the way the engines do and print the failures in fix order, so you know which work counts toward the rank, which counts toward the citation, and which counts toward both.