SEO for AI: How to Make Your Product Discoverable by LLMs

How often do you use Google Search?

Now, how often do you find yourself searching via ChatGPT, Perplexity, Claude, or Gemini?

I'll never forget the moment I casually asked ChatGPT, "Is there any tool that does analytics on all Substack newsletters?"

And there it was, in the answer, my own scrappy little app. A project I'd barely promoted. It had a few dozens of users, tops. Yet somehow, ChatGPT knew about it.

My first reaction? Excitement. My second? Utter confusion.

How did an AI, supposedly trained on data up to a certain cutoff, find my obscure tool? Why my app? What had I unknowingly done right?

As a builder, part of my launch checklist has sometimes included basic SEO, write good copy, submit to directories, share on socials. But this moment cracked open a bigger question: how do you actually make something searchable by AI today?

I started wondering:

• How does AI search work?
• Does traditional SEO still apply?
• What about my writing on Substack or Medium—can that be discovered by AI tools?
• Are the AI-powered website builders and no-code platforms helping or hurting discoverability?

That surprising ChatGPT result sent me down a rabbit hole. I started dig into months of experiments, app launches, and figuring out how AI systems actually index and recall content.

This article is the result of that deep dive.

It's a long one, so feel free to jump to what interests you most:

1. How AI Search Actually Works
2. Why AI Can't See Your Web App—And How to Fix It
3. Optimizing Your Substack and Blog Posts for AI Discoverability

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1. How AI Search Actually Works?

We've grown used to Google returning a list of links. But AI tools like ChatGPT, Perplexity, and Claude don't just search, they answer. And how they do that is fundamentally different.

Let's break down how AI search actually works, and what it means for making your content findable.

1.1 The RAG System Behind Every AI Answer

At the core of most AI search engines lies a concept called Retrieval-Augmented Generation (RAG). If you've read my earlier article on the topic, this will sound familiar.

Think: LLM = Expert with broad knowledge Retriever = Research Assistant fetching current, relevant information on demand

When you ask a question, RAG kicks in:

• The retriever fetches "relevant" pages based on semantic similarity
• The filter determines which sources are "trustworthy"
• The generator synthesizes an answer using that information.

You've seen this in action when Perplexity cited a niche blog post, or ChatGPT with browsing dug up something obscure in real time.

The key insight for builders: RAG systems don't just find your content—they decide if it's worth citing. Understanding this pipeline helps you optimize for each stage.

1.2 AI Doesn't Crawl the Web Like Google—It Borrows

One of the most surprising things I learned while digging into AI search? Most AI tools don't actually crawl the entire internet themselves.

They borrow.

• ChatGPT (with Browsing): Uses Bing's search index. It doesn't crawl; it borrows from Microsoft's infrastructure.
• Perplexity: A hybrid model. Part Bing index, part lightweight direct crawling, plus its own re-ranking logic.
• Claude: Relies on curated datasets and may query external APIs—but it does not crawl the open web directly.

Takeaway: If your content isn't indexed by Google, Bing or another partner, it's likely invisible to these AI systems.

In a recent SEO study analyzing 10,000 finance/SaaS query-answer pairs, there was a strong correlation (~0.65) between websites ranking on Google's first page and being mentioned in LLM-generated responses.

1.3 The Infrastructure Powering This New Era

When you ask a question, Perplexity spins up a multi-agent team behind the scenes:

1. 🧭 Planning Agent – figures out how to break your query into smaller pieces
2. 🔍 Search Agents – run live queries across APIs like Bing, Brave Search, Google
3. 📊 Filtering Agents – review results, sort by semantic relevance
4. ✍️ Generation Agent – synthesizes everything into a conversational answer with citations

1.4 Why AI Search is So Different (and So Expensive)

Think of it this way: Google is like flipping through a card catalog. AI is like asking a smart librarian: "What's the most overlooked book on this topic?"

AI search isn't just a better version of Google. It's a whole new system, with new rules, new tech, and new expectations for content visibility.

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