What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

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.

How long does an analysis take?

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.

How accurate are the results?

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.

What security checks are performed?

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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hb.afl.rakuten.co.jp

https://hb.afl.rakuten.co.jp· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

Mobile

Sponsored

Hosting Provider

Rakuten, Inc.

IP Address

133.237.176.198

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS23820

Organization

Rakuten, Inc.

Server

Apache

Performance

Page Speed

1 MB

7 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Rakuten, Inc.

Technology Stack

1 Technologies Detected

Web Servers

Apache

SEO Analysis

D41/100

hb.afl.rakuten.co.jphb.afl.rakuten.co.jp

ご指定のページが見つかりません（エラー404）：楽天

No description available for this page.

Title Length26 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

8 issues found

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Security Score

81%Very Good

Static / Informational

HTTPS

No WAF

57d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

23.07.2025

Valid Until

14.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.afl.rakuten.co.jpafl.rakuten.co.jp

SHA-256 Fingerprint

7C:B9:12:42:F8:F8:02:20:01:FE:56:CF:6D:DE:9C:79:AA:1C:CF:6A...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

1089

content-type

text/html

date

Mon, 16 Feb 2026 23:39:35 GMT

last-modified

Thu, 08 Feb 2024 15:51:12 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

hb.afl.rakuten.co.jp

DNSSEC

Not Enabled

Typography & Readability

NotoSansJP

79/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

13/25

1.88x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

NotoSansJP

Sans30px

Body Font

NotoSansJP

Sans16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

30px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

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

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Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

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Last analyzed: 16 Feb 2026 at 23:39

Historical Analysis & Change Tracking