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What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

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Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

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Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

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The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

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rakuten.co.jp

https://rakuten.co.jp· First analyzed 11 Feb 2026· Updated 11 Feb 2026

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rakuten.co.jp

Mobile

Sponsored

Hosting Provider

Rakuten, Inc.

IP Address

133.237.182.225

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS23820

Organization

Rakuten, Inc.

Server

Apache

Nameservers

ns01.rakuten.co.jp.ns02.rakuten.co.jp.ns03.rakuten.co.jp.ns02.rakuten.ad.jp.+2 more

Performance

Page Speed

387 KB

250 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Rakuten, Inc.

Technology Stack

4 Technologies Detected

Libraries

CSS Frameworks

Web Servers

Customer Support

SEO Analysis

D58/100

rakuten.co.jprakuten.co.jp

【楽天市場】Shopping is Entertainment! ：インターネット最大級の通信販売、通販オンラインショッピングコミュニティ

楽天市場はインターネット通販が楽しめる総合ショッピングモール。楽天ポイントがどんどん貯まる！使える！毎日お得なクーポンも。食品から家電、ファッション、ベビー用品、コスメまで、充実の品揃え。

Title Length70 chars

Recommended: 50-60 chars

Description Length94 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (326/397)
• Missing viewport meta tag - page may not be mobile-friendly

5 issues found

Upgrade to view details

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

97d

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟣 Private(private)

content-encoding

📦 Gzip(gzip)

content-length

55613

content-type

text/html; charset=UTF-8

date

Wed, 11 Feb 2026 00:59:55 GMT

pragma

no-cache

Good Warning Issue

Typography & Readability

Meiryo

36/100

Readability

/30

5/40

12px · LH 1.10

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Meiryo

Sans

Body Font

Meiryo

Sans12px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

20px

12px

11px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

⚠️ Tight line spacing (1.10). Consider 1.4-1.6 for better readability.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 124 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

r.r10s.jp(14)rakuten.co.jp(3)error.rakuten.co.jp(2)cdn.rmc.contents.rakuten.co.jp(1)

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Last analyzed: 11 Feb 2026 at 01:01

Historical Analysis & Change Tracking

rakuten.co.jp

【楽天市場】Shopping is Entertainment! ： インターネット最大級の通信販売、通販オンラインショッピングコミュニティ

【楽天市場】Shopping is Entertainment! ：インターネット最大級の通信販売、通販オンラインショッピングコミュニティ