These three acronyms get thrown around a lot, and it's easy to assume they're all just flavors of "make your website better." They're not — each one optimizes for a completely different audience, and AI search has made the gaps between them much more important.
SEO — optimizing for search engine crawlers
SEO (Search Engine Optimization) is about ranking well on Google. It covers keyword targeting, backlinks, page speed, and technical crawlability. This is the oldest and most familiar of the three, and it's still necessary — but it was built entirely around how traditional search engines rank pages, not how AI models synthesize answers.
CRO — optimizing for human visitors
CRO (Conversion Rate Optimization) is about what happens after someone lands on your site. Are they buying, signing up, or leaving without doing anything? This covers page layout, clear calls-to-action, trust signals, and load speed. You can have perfect SEO and still leak every visitor you get if your CRO is weak.
ASO — optimizing for autonomous agents
ASO (Agentic Search Optimization) is the newest of the three, and the least understood. Tools like ChatGPT Operator and Claude agents are starting to browse, compare, and even purchase on behalf of users. ASO covers whether your site is navigable by a machine — sitemap.xml, ARIA attributes, machine-readable forms, predictable internal linking. A site with excellent SEO can still be completely unusable to an autonomous agent.
So which one matters most for AI visibility?
None of them alone. AI visibility actually sits at the intersection of a fourth concept — GEO (Generative Engine Optimization) — whether AI models like ChatGPT and Perplexity can understand your content well enough to include you in a generated answer. GEO overlaps with all three:
- It needs SEO's crawlability to be found at all
- It needs CRO's clarity to state what you do in extractable language
- It needs ASO's structure so agents can navigate and verify you
Skipping any one of these creates a gap. A site with great SEO but no structured data ranks on Google and is invisible to ChatGPT. A site with great GEO but poor CRO gets AI-recommended traffic that leaves without converting.
How to check where you actually stand
Most tools measure one of these in isolation. Greater Than Services scores all three — CRO, GEO, and ASO — in a single audit, plus an AI Visibility Score that tests whether you're actually named in AI-generated answers.
- Free preview: greaterthanservices.com
- Full report with fix code: $4.99
Bottom line
SEO gets you found by search engines. CRO turns visitors into customers. ASO makes you usable to autonomous agents. AI visibility needs all three working together — which is why auditing them separately misses the real picture.
We built Greater Than Services to score all three pillars in one report. Try the free preview.
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