Different end goals
SEO optimises to rank a page for a query. GEO optimises to be the source an AI engine cites when it answers a question. SEO wins the click; GEO wins the mention inside the AI's answer — which increasingly happens before any click. The unit of success differs too. SEO counts positions, clicks and sessions you can read in analytics. GEO counts whether a model names or links you, which no standard dashboard reports yet, so you measure it by asking the engines directly and logging the answers.
Same foundation
Both rely on content that genuinely answers intent, a technically sound site, and real trust signals. AI engines pull from the search index, so you can't do GEO without the SEO basics underneath. GEO adds entity clarity, citable phrasing and retrieval-ready structure on top. The shared base is why most of the audit overlaps — but the optimisation targets diverge once you pass it.
Where the work actually diverges
Past the shared foundation the day-to-day splits. SEO tunes title tags, internal links, page speed and link equity to move a ranking. GEO writes self-contained, quotable passages, hardens your entity across the web so models describe you consistently, opens AI-crawler access in robots.txt, and seeds corroborating mentions on third-party sites so a claim about you isn't only on your own domain. The granularity differs as well. SEO competes at the page level for a query, where ranking fourth still wins traffic. GEO competes at the passage and entity level — one quotable block gets lifted, and the entire description a model holds of you gets reused across many answers. SEO mostly improves pages you own. A real chunk of GEO happens off your site, because what a model believes about you is assembled from many sources, not one.
When to weight one over the other
They're layers, not a choice — but the emphasis shifts with your situation. Lean SEO-heavy when you're not yet ranking for your core terms, run a transactional or local business where the click is the conversion, or compete in a query set where AI answers barely appear. Lean GEO-heavy when you already rank well but AI answers skip you, when buyers research your category by asking chatbots, or when competitors are getting named in AI answers and you aren't. If you're invisible in the index, fix SEO first — there's nothing for a model to pull from. So the order is usually SEO to get found, GEO to get cited.
Why you need both
SEO alone leaves you ranking but possibly uncited by AI. GEO without SEO has no index presence to be pulled from. Done together, strong SEO feeds AI citations and GEO shapes how you're represented in them. The formula many use — AI visibility minus SEO equals zero.