SEO vs AEO vs GEO: What's the Difference?

Definitions without the vendor spin

SEO is the 25-year-old discipline of earning visibility in search engine results: technical crawlability, content relevance, and authority signals like links and brand mentions. It remains the largest traffic channel for most businesses.

AEO optimizes for surfaces that answer instead of listing links — featured snippets, People Also Ask, voice assistants, and Google's AI Overviews. The unit of competition shifts from 'page ranks #3' to 'this passage is the answer.'

GEO optimizes for generative engines — ChatGPT, Perplexity, Claude, Gemini — where the output is a synthesized response that may cite or recommend brands. Here you're influencing what models retrieve and repeat, through citable content, consistent entity signals, and presence in the sources LLMs trust.

How they overlap — the part nobody explains

Roughly 70% of the work is shared. Clean site architecture, fast pages, structured data, and genuinely authoritative content feed all three. An LLM deciding whether to cite you leans on many of the same signals Google uses to rank you: crawlable content, entity clarity, and third-party corroboration.

The differences live at the edges. AEO rewards specific formatting: 40–60 word direct answers under question-formed headings, FAQ schema, tables. GEO adds off-site work SEO ignores — getting mentioned in the listicles, review sites, Reddit threads, and news coverage that models retrieve when asked for recommendations.

This is why 'GEO agency vs SEO agency' is often a false choice: a competent 2026 operator does all three as one system.

• Shared foundation: technical health, structured data, authority
• AEO layer: answer-shaped formatting and schema
• GEO layer: citations, entity consistency, presence in LLM source material

Different metrics for different surfaces

SEO measures rankings, organic sessions, and conversions — mature tooling, twenty years of benchmarks. AEO measures snippet and AI Overview ownership: how often your content is the featured answer for your keyword set.

GEO measurement is younger and messier. The working metrics are AI share of voice (how often your brand appears when a panel of prompts asks about your category), citation frequency across engines, and referral traffic from AI surfaces — which converts remarkably well because the user arrives pre-sold by a recommendation.

Budget note: AI referral traffic is still a fraction of Google's volume for most sites, but it is the fastest-growing segment, and early movers compound. Treat GEO as an option you buy before the market prices it in.

How to budget across all three in 2026

If your organic foundation is weak, fix SEO first — GEO on top of a crawl-broken site is decoration. Allocate the majority of effort to shared-foundation work: content depth, technical health, authority building.

Then layer AEO formatting into everything you publish (it costs almost nothing extra when done at creation time) and run GEO as a deliberate off-site program: citable original data, consistent brand descriptions, and earned mentions in the sources models retrieve.

Chalk Labs runs these as one engine rather than three line items, because that's how the surfaces actually behave. Retainers start around $3k/month. But whoever you hire, reject any pitch that treats GEO as a replacement for SEO — it's an extension, not a substitute.

Questions we hear about this