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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bunshun.jp

https://bunshun.jp· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

bunshun.jp

Sponsored

Hosting Provider

Japan Business Press Co., Ltd.

IP Address

202.238.151.148

Server Location

🇯🇵 Kaizuka, Japan

ASN

AS2497

Organization

Japan Business Press Co., Ltd.

CDN

Nameservers

ns01.vips.ne.jp.nfmail.bunshun.co.jp.ns00.vips.ne.jp.

Performance

Page Speed

634 KB

243 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

Vue.js

Infrastructure

Hosting

Japan Business Press Co., Ltd.

CDN

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

17 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Microsoft Clarity

Advertising

Google Ads Twitter Ads Criteo Taboola

Libraries

CSS Frameworks

Frameworks

UI Components

Icon Libraries

Fonts

Tag Managers

SEO Analysis

B78/100

bunshun.jpbunshun.jp

文春オンライン | 世の中の「ほんとう」がわかります

文藝春秋が運営するニュースサイト。文春オンラインは世の中を驚かせるスクープから、毎日の仕事や生活に役立つ話題までお届けする情報メディアです。

Title Length26 chars

Recommended: 50-60 chars

Description Length70 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

robots.txt

7 rules

Sponsored

Security Score

15%Critical

Critical / Transactional

HTTPS

No WAF

283d

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/1.1

Valid From

22.01.2026

Valid Until

30.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

*.bunshun.jppost.crea.bunshun.jppost-v.crea.bunshun.jppost.books.bunshun.jppost-v.books.bunshun.jppost.number.bunshun.jppost-v.number.bunshun.jpsc.number.bunshun.jp+1 more

SHA-256 Fingerprint

CC:41:44:58:C5:07:2A:39:E8:FD:55:8A:8A:8A:F8:33:D0:A6:7C:80...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 0s(max-age=0, private, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-length

24884

content-type

text/html; charset=utf-8

date

Fri, 20 Feb 2026 13:11:04 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

sgw.bunshun.co.jp

nfmail.bunshun.co.jp

Domain Information

bunshun.jp

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Legitimate interest basis mentioned

Typography & Readability

Hiragino Kaku Gothic ProN

63/100

Readability

/30

22/40

14px · LH --

Hierarchy

/20

18/25

2.29x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Hiragino Kaku Gothic ProN

Sans32px

Body Font

Hiragino Kaku Gothic ProN

Sans14px

Contrast Ratio

Reading Comfort

~45 CPL

Needs attention

32px

30px

16px

14px

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

✅ Strong hierarchy: Headlines are 2.3x larger than 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.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Cramped layout: 122 elements lack adequate spacing.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

9 Tools Detected

Enterprise

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

TaboolaMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

clarity.ms(5)connect.facebook.net(3)googletagmanager.com(3)scripts.clarity.ms(2)google-analytics.com(2)

Website Identity

Facebook X (Twitter)YouTube Threads

Sponsored

Last analyzed: 20 Feb 2026 at 13:12

Historical Analysis & Change Tracking