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.

Back to Search

amazon.co.jp

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

Export

amazon.co.jp

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

18.246.98.187

Server Location

🇺🇸 Portland, United States

ASN

AS16509

Organization

Amazon Technologies Inc. (us-west-2)

Server

CDN

Nameservers

ns2.amzndns.co.uk.ns2.amzndns.com.ns2.amzndns.net.ns2.amzndns.org.+4 more

Performance

Page Speed

633 KB

68 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Customer Support

Zendesk

SEO Analysis

C64/100

amazon.co.jpamazon.co.jp

Amazon | 本, ファッション, 家電から食品まで | アマゾン

Amazon.co.jp 公式サイト。アマゾンで本, 日用品, ファッション, 食品, ベビー用品, カー用品ほか一億種の商品をいつでもお安く。通常配送無料(一部を除く)

Title Length35 chars

Recommended: 50-60 chars

Description Length85 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

3 issues found

Upgrade to view details

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

194d

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

alt-svc

h3=":443"; ma=93600

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Wed, 11 Feb 2026 00:45:12 GMT

etag

"32bbd-64a81af031c25-gzip"

Good Warning Issue

Typography & Readability

Hiragino Kaku Gothic ProN

43/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Hiragino Kaku Gothic ProN

Sans

Body Font

Hiragino Kaku Gothic ProN

Sans14px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

18px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

⚠️ Cramped layout: 9 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

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

m.media-amazon.com(10)images-fe.ssl-images-amazon.com(7)c.amazon-adsystem.com(1)

Website Identity

amazon.co.jp

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Last analyzed: 11 Feb 2026 at 00:46

Historical Analysis & Change Tracking