AIO (AI Overview) citations are selected by different criteria than organic search rankings. Ahrefs research shows 62% of AIO citations come from outside the organic top 10, and our site was cited first in AIO despite not appearing on page 1 organically.
What Happened: The Facts
On May 8, 2026, a Google search for 'seo score check free' revealed the following:
AIO (AI Overview)
Listed first as 'Free SEO Score Check (codequest).' The description included specific features: 'Diagnoses 45 items from URL input. Auto-generates improvement code.'
Organic Search Results
Our site did not appear on page 1 (top 10). Established tools like ohotuku.jp, EmmaTools, and itomakihitode.jp dominated the results.
Our site (CodeQuest.work SEO) has been live for about 3 months, with over 2,000 cumulative checks. With a young domain and few backlinks, it's natural that we can't beat established tools in organic search.
Yet AI citation selected us at the top. Is this 'gap' coincidental, or are there reproducible structural factors?
Cross-Referencing External Research
This phenomenon isn't unique to our site. Ahrefs' analysis of 863,000 SERPs (2024) reveals clear patterns in AIO citation sources.
Key Findings from Ahrefs Research
- •62% of AIO citations come from pages outside the organic top 10
- •Average DR of AIO-cited pages is 65 — mid-sized sites are frequently cited
- •AIO prioritizes pages with 'information suitable for answering' over 'high-ranking pages'
Seer Interactive's analysis also found that approximately 55% of AIO-cited content is extracted from the top 30% of each page. This means having a structure that directly answers search intent at the beginning of the page is a key condition for AIO citation.
Our case aligns with these research findings. Even without organic ranking, sites with a certain level of Google trust can enter the AIO citation candidate pool.
Why We Were Cited: Structural Factor Analysis
We analyze the structural factors behind our AIO citation by reverse-engineering from our implementation.
1. llms.txt Implementation
Our site implements llms.txt (a site information file for LLMs). It provides structured information — tool overview, check item count (45 items), supported categories (4 categories) — in a format directly readable by AI.
2. Rich Structured Data
We implement multiple JSON-LD schemas including SoftwareApplication, FAQPage, WebSite, and Organization. Tool features, pricing plans, and FAQs are described in machine-readable format.
3. Direct-Answer Content Structure
The landing page opens with specific numbers: 'Just enter a URL to comprehensively diagnose your website's SEO across 45 items and 4 categories.' AI can immediately extract 'what this tool does.'
4. Clear Differentiation Points
'Auto-generates improvement code' — a feature unique to our tool — is mentioned repeatedly on the page. AIO included this differentiator verbatim in its citation, showing AI recognizes and reflects 'what makes this different.'
What This Case Means
What this case reveals is that SEO in the AIO era has two coexisting evaluation axes.
| Axis | Organic Search | AIO Citation |
|---|---|---|
| Key Factor | Backlinks, domain authority, comprehensiveness | Direct answers, structured data, extractability |
| Disadvantage for New Sites | Significant (backlink accumulation takes time) | Relatively small (can compete on structure and content) |
| Speed of Results | Months to years | Relatively fast after structural improvements |
For new sites with little domain history or niche areas where backlink acquisition is difficult, a strategy of first gaining AIO citations for brand awareness before pursuing organic rankings could be effective.
Caution: AIO Citation ≠ Traffic Acquisition
Being cited in AIO doesn't guarantee site visits. AIO completes answers in place, often resulting in 'zero-click searches.' AIO citation is a means for brand awareness and trust building, not a direct traffic acquisition method.
Reconfirming: 'GEO Is Just Good SEO'
In our previous SEO Lab article, we concluded that 'GEO (Generative Engine Optimization) is just good SEO.' This case reinforces that hypothesis.
Looking back at why our site was cited in AIO, every factor is an extension of basic SEO practices.
- •Structured data implementation → Basic SEO practice
- •Direct answers to search intent → Content SEO basics
- •Clear differentiation → USP (Unique Selling Proposition) clarification
- •llms.txt provision → AI-oriented information disclosure, an extension of robots.txt
We did nothing specifically for GEO. Thorough good SEO practices simply manifested as AIO citation first. We expect organic rankings to follow.
What Practitioners Can Do Starting Today
From this case study, we organize actionable steps practitioners can take to aim for AIO citations.
Directly answer search intent at the top of the page
55% of AIO citations are extracted from the top 30% of pages (Seer Interactive). State what the page offers in 1-2 sentences with specific numbers, right below the h1 or in the lead text.
Implement structured data
Implement at least FAQPage and WebSite in JSON-LD. For tools and services, add SoftwareApplication. Making information machine-readable for Google is a prerequisite for AIO citation.
Set up llms.txt
Place llms.txt (and llms-full.txt) at the site root so AI can directly retrieve site overview, features, and characteristics. The cost is creating one text file, and the benefits are ongoing.
Clearly state your differentiation points
Clearly describe 'what makes you different' on the page. AIO tends to preferentially cite sites with clear differentiation when generating comparison information. In our case, 'auto-generates improvement code' was included verbatim in the citation.
These measures are covered by CodeQuest.work SEO's diagnostic items. Start by checking your site's SEO score to diagnose any gaps in structured data or meta information.
Check If Your Site Is Ready for AIO Citation
Just enter a URL to diagnose 45 items including structured data, meta information, and content structure. Verify whether the SEO foundation needed for AIO citation is in place.
Written by
今井政和SEO Director / Frontend Developer
SEO Director with 20+ years of web industry experience. Creator of CodeQuest.work SEO and the official WordPress plugin "ORECTIC SEO CHECK." Author of a book on web strategy inspired by Edo-era merchant principles.
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