Do I need AEO if I already invest in SEO?

Probably. Strong SEO gives AEO a better foundation, but it does not answer the same question. SEO tells you whether people can find you in search results. AEO tells you whether an engine understands, cites, and names you when it answers that question.

The best data we have says something simple: site trust, deep content, and technical health predict whether an AI engine names you. Those are the same things good SEO builds. What SEO does not do on its own is turn that trust into something an AI engine can quote. This is a separate job. Skip it, and your work sits on a shelf instead of paying off.

What a 14,000-site study found

A company called Search Atlas ran a large study to test this. They checked almost 14,000 websites. Then they compared how often six AI engines, including ChatGPT, Gemini, and Perplexity, named each one. One popular AEO trick is a file called llms.txt. It is a short text file meant to tell AI tools what a site contains. Sites with the file scored almost the same as sites without it. The gap was just 0.42 points on a 100-point scale. This is close to no gap at all.

At first, the best llms.txt files looked like they helped more. But then the researchers checked how much authority each site already had. Once they did this, most of the gap disappeared. The sites with the best files were simply the sites that already ranked well. The file rode on that trust. It didn’t build it. We serve one ourselves, and this is exactly how we treat it: cheap reinforcement on top of the real work, but not a driver of the work.

Why your SEO work still counts

The study points to the real driver: deep content, technical health, and site trust. Those are the three things good SEO has always chased. A crawler still has to read your site before any engine will trust what it finds there. Clean code. Real content. A long track record. Every year you spent on SEO built that. None of it gets thrown out when you add AEO on top.

What SEO doesn’t do on its own

SEO gets a crawler to find your site and rank it. It doesn’t hand an AI engine the three things it needs before it will say your name out loud. Read our full answer on what AEO actually is for the long version. Here’s the TL;DR.

An AI engine checks for:

• Readability. Can a crawler even read the page? Most SEO work already covers this.
• Citability. Does the page hold one clear, quotable answer, or does it just talk around the question? SEO rewards long pages full of keywords. Engines reward one clean sentence they can lift whole.
• Namability. Can the engine say who you are with confidence? This requires a clear entity signal: one consistent name, a real About page, and behind-the-scenes data that removes any doubt.

Ranking on Google doesn’t guarantee any of the three. See how thin the overlap really is between what ranks on Google and what AI engines cite. A competitor with weaker SEO but a clearer entity signal often gets named instead of you.

A real-world example

Picture a local plumbing company. It ranks on page one of Google for “emergency plumber” in its city. Real reviews. Years of backlinks. Strong SEO by any measure. Now someone asks ChatGPT the same question in plain words: “Who can I call for a broken pipe tonight?” The engine names two competitors instead. Why? Neither the plumber’s homepage nor its Google Business page states, in one clear sentence, who they are, where they work, and what makes them the safe call at midnight. The SEO got them found. Nothing on the page gave the AI engine a sentence worth quoting.

Isn’t this just SEO with a new name?

No. It shares a foundation, not a toolkit. SEO aims at a list of links a person scans by eye. AEO aims at one answer a machine builds and repeats. The overlap is real: technical health, real content, a site that other engines already trust. The gap is real too: data that states who you are, pages an AI engine can quote whole, and a name your competitor doesn’t push out instead. Skip this second layer, and the SEO keeps ranking you while the answer names someone else.

A two-minute check

Open ChatGPT, Claude, or Perplexity. Ask the question your own customer would ask, in their words, with no brand name in it. Something like “who’s the best [what you do] in [your city]?” Read the answer. If you’re missing and a competitor is there instead, it’s not an SEO problem. Your SEO ranking can look perfectly healthy while this happens. It usually does.

What to do about it

Start by measuring, not guessing. Run your homepage through our free single-page scan to see how machine-legible it is today. SEO fundamentals show up there too, since both are built on the same ground. If the gap between your rankings and your AI answers looks real, an AI Visibility Audit tests it properly with the questions your customers actually ask, across AI engines, and benchmarked against whoever is beating you to the answer right now.

Your SEO work built the foundation. The only question left is whether anything is standing on it yet.