GEO vs AEO vs SEO: what's the difference, and what to do first

GEO covers engines such as Google AI Overviews and AI Mode, ChatGPT search, Perplexity and Copilot. All three depend on the same thing: a search engine having crawled and indexed the current version of your page. AI answers cite what's been crawled, and they lean toward pages that are kept current. This guide compares SEO vs AEO vs GEO side by side, shows where they overlap, and gives you one workflow that covers all three.

The short answer

SEO, AEO and GEO are overlapping disciplines with different finish lines. SEO targets rankings in classic results, AEO targets direct answers, and GEO targets citations in generative AI answers. They share one foundation: indexed, trusted, current pages.

If you only remember one thing: GEO and AEO are not replacements for SEO. Google's AI optimization guide says that "optimizing for generative AI search is optimizing for the search experience, and thus still SEO." For the bigger picture, see our AI search optimization hub.

SEO: ranking in classic search results

SEO is the practice of improving a site so its pages rank in a search engine's classic results and earn clicks. It covers technical health (crawling, indexing, speed), content that matches search intent, and authority signals such as links and mentions.

SEO's success metrics are familiar: rankings, impressions, clicks, click-through rate and the conversions that follow. The searcher sees a list of links and chooses one. Your job is to be high on that list and compelling enough to click.

SEO still feeds every AI surface. In July 2025, Ahrefs found that 76.1% of pages cited in Google AI Overviews also ranked in the organic top 10 for the query (Ahrefs). A March 2026 follow-up, after AI Overviews moved to Gemini 3, measured 37.9%. Ahrefs links the drop to Google leaning more on fan-out searches, but it also changed its parsing method, so the two figures aren't a clean comparison (Ahrefs). Ranking is still a major input. A NeurIPS 2025 benchmark reached a similar conclusion for generative engines generally: a document's position in the model's context, driven by traditional search ranking, mattered far more for citation than on-page rewording (C-SEO Bench).

AEO: becoming the direct answer in snippets, voice and AI answers

AEO is the practice of structuring content so an engine can present it as the direct answer to a question. It started with featured snippets and voice assistants, and now extends to AI Overviews and chat-style answers.

AEO shifts the unit of work from the page to the passage. A good AEO passage:

• sits under a heading phrased as the question,
• answers it in one or two sentences that make sense out of context,
• follows with steps, a list or a table where the answer has parts.

The trade-off is clicks. When the engine shows your answer in full, some readers never visit. AEO measures success in answers captured, brand exposure and the clicks that remain. Read what AEO is for the full definition and a page-by-page checklist.

GEO: being cited by generative engines

GEO is the practice of making content likely to be retrieved, used and cited by generative AI engines that write answers from multiple sources. The term comes from a 2023 Princeton-led paper, published at KDD 2024, that introduced "generative engine optimization" and a benchmark to measure it (Aggarwal et al.).

That paper found that adding quotations (about 41%), statistics (about 31%) or source citations (about 28%) raised a page's visibility in answers from a simulated engine, with the biggest gains for lower-ranked sources (arXiv 2311.09735). Two caveats matter. The test used a fixed set of already-retrieved pages, so it shows how to get used once retrieved, not how to get retrieved. And it never tested freshness or dates.

GEO adds weight to signals classic SEO treats as secondary:

• Brand mentions across the web. In a vendor study of 75,000 brands (May 2025), Ahrefs found brand web mentions correlated with AI Overview visibility (ρ = 0.664) more strongly than backlinks did (0.218) (Ahrefs). That's a correlation, not proof of cause.
• Specific, verifiable claims an engine can quote with confidence.
• Freshness, especially for topics that change.

For how generative engines choose sources and a 30-day GEO plan, see the GEO guide. The LLM SEO guide covers the language-model side: training data versus live retrieval.

Side-by-side: goal, surfaces, signals and metrics

The clearest way to compare SEO vs AEO vs GEO is by goal, surface, signals and metrics. The overlap is larger than the differences.

On freshness, the evidence is real but modest. A July 2026 vendor study by Seer Interactive (7,683 pages cited by ChatGPT, Gemini and Perplexity for four brands) found 75% of cited pages had been updated within a year (Seer Interactive). Yet a July 2025 Ahrefs study of about 17 million citations found Google AI Overviews cite pages slightly older than organic results on average (Ahrefs). Freshness helps most where the topic changes.

Where they overlap: crawlable, indexed, trusted, current pages

SEO, AEO and GEO overlap on four properties: the page is crawlable, indexed, trusted and current. A page missing any one of them underperforms on all three surfaces at once.

1. Crawlable. Search and AI crawlers can reach the page. Google lists "ensuring that crawling is allowed in robots.txt, and by any CDN or hosting infrastructure" as a baseline (Google Search Central). OpenAI says sites that block OAI-SearchBot "will not be shown in ChatGPT search answers" (OpenAI).
2. Indexed. The page is in the engine's index. Google states that to appear as a link in AI Overviews or AI Mode, "a page must be indexed and eligible to be shown in Google Search with a snippet" (Google Search Central). Indexing makes a page eligible; it doesn't put it in the answer.
3. Trusted. Authority, accuracy and reputation still decide which indexed page wins.
4. Current. The engine's stored copy matches what's on your site today. Google says crawling "can take anywhere from a few days to a few weeks" (Google Search Central), so an update can sit unseen for a while.

Properties one, two and four are mechanical, and they're the ones teams most often assume rather than verify. A quick way to check what Google has seen across all your important URLs closes that gap before you spend time on content.

Which to prioritise for your site

Prioritize by where your audience asks questions and by what already works, but always fix crawling and indexing first. In most cases that means continuing SEO and adding AEO and GEO practices to the same pages, not starting separate programs.

For agencies, the selling point is coverage: one set of improvements reported across three surfaces. Our page on AEO and GEO for agencies covers how to deliver that work and report its indexed status to clients.

Avoid buying a separate "GEO strategy" that skips the foundations. Google says you don't need new machine-readable files, AI text files or special markup to appear in Google Search, and that structured data "isn't required for generative AI search" (Google AI optimization guide). Most of what gets sold as GEO is good SEO and clear writing.

One workflow that covers all three

One workflow covers SEO, AEO and GEO when it moves each page through the same five stages: access, indexing, answers, freshness and measurement. Run it on every new or updated page.

1. Access. Allow Googlebot, Bingbot, OAI-SearchBot and PerplexityBot in robots.txt and at your CDN or firewall. Check that important content is in HTML text, not only in images or client-side scripts.
2. Indexing. Add the page to your sitemap with an accurate lastmod, link to it from relevant indexed pages, and confirm it's indexed in its current version. Push any URL that isn't.
3. Answers. Match the title to the main question. Open each section with a direct answer. Use tables for comparisons and numbered steps for processes. Back claims with specific, sourced facts.
4. Freshness. Update the substance of important pages when facts change, then the date. Don't change dates on unchanged pages. Get each update re-crawled.
5. Measurement. Track rankings and clicks for SEO, snippets for AEO, and citations, mentions and AI referrals for GEO. When a page isn't cited, check its index status before rewriting.

Nobody can guarantee a ranking, an answer box or a citation. Being crawled sooner makes a page eligible sooner; whether it's cited is the engine's call, based on quality, authority and relevance. Steps one, two and four decide whether your page is in the running at all.

FreshlyCited handles that part of the workflow for Google, whose AI Overviews and AI Mode link only to pages in its index. It checks which of your pages and links Google has indexed, pushes the invisible ones and re-checks them, then gives you a report you can share with a client. For sites you verify with an IndexNow key file (an open "this page changed" notice that Bing accepts; Google doesn't use it), the same URLs are also sent to Bing, free. ChatGPT, Perplexity and other assistants use their own crawlers and search partners. We don't submit to them, and we don't claim to. Check your own links free.