yuhikaku.co.jp

https://yuhikaku.co.jp· First analyzed 19 May 2026· Updated 19 May 2026

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yuhikaku.co.jp

Mobile

Sponsored

Hosting Provider

Fujitsu Limited

IP Address

124.24.61.142

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Fukagawa, Japan

ASN

AS55374

Organization

Fujitsu Limited

Server

Apache

Nameservers

ns-1811.awsdns-34.co.uk.ns-38.awsdns-04.com.ns-801.awsdns-36.net.ns-1525.awsdns-62.org.

Performance

Core Web Vitals

Weight

First Contentful Paint

3.2 s10%

Speed Index

4.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.1 MB

250 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Fujitsu Limited

Technology Stack

8 Technologies Detected

Analytics

Libraries

UI Components

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

D47/100

Meta Tags8/15

Content9/12

Headings1/8

Technical11/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

yuhikaku.co.jpyuhikaku.co.jp

トップページ | 有斐閣

明治10年創業の出版社です。法学、経済学、人文科学一般に関する書籍を発行しています。定期刊行物は，年版の『六法全書』，『ポケット六法』，『有斐閣判例六法』，『有斐閣判例六法Professional』などを，定期雑誌では『ジュリスト』，『法学教室』を刊行しています。HPでは，電子書籍やオンデマンド出版のご案内もし...

Description truncated.

Title Length12 chars

Recommended: 50-60 chars (~72px / 580px)

Description Length162 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (192/250) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

10 issues found

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Crawlability

Sitemap

robots.txt

0 rules

Allows all crawlers

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F29/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

7/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

def. lists

Text ratio:2%

Words:264

Token eff.:Too Short

Sections/1K:56.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary10w

Descriptive Headingsavg 1.1w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

44/100

Passed

Critical

Warnings

Images & Alt Text

2/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

7/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

5/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

4 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

39/100

138 mg

CO₂e / view

1.1 MB

Page Weight

70%

Cleaner Than

New Visitor

158 mg

Returning (cached)

79 mg

Annual (10K/mo)

16.6 kg

Emission Segments

Data Center

31 mg

Network

33 mg

Device

74 mg

Resource Breakdown

JavaScript

124.6 KB

Images

857.1 KB

CSS

120.3 KB

HTML

16.1 KB

Green Hosting Not Verified

Fujitsu Limited

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

No WAF

75d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

01.07.2025

Valid Until

02.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.yuhikaku.co.jpyuhikaku.co.jp

SHA-256 Fingerprint

8C:B9:BF:60:9B:63:5F:0C:C0:22:DF:F0:02:29:7E:7E:EE:7D:79:EC...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

16137

content-type

text/html; charset=utf-8

date

Tue, 19 May 2026 00:05:06 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.securemx.jp

Domain Information

yuhikaku.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

43/100

Not Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

ＭＳＰゴシック

WCAG Partial

45/100

Readability

/30

11/30

12px · LH --

Hierarchy

/20

6/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

1 font

Heading Font

ＭＳＰゴシック

Sans

Body Font

ＭＳＰゴシック

Sans12px

Contrast Ratio

1:1

5 issues

Reading Comfort

Single Font Family

left aligned

24px

14px

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

9 unique colors

Light

#f9f8f3

Background· 42.00000000000001%

#160a06

Accent· 11.3%

#9b7c3f

Primary· 0%

#d2c7b8

Secondary· 8.6%

#8e9677

Secondary· 8.2%

#673610

Accent· 7.9%

#dcdfd7

Secondary· 7.3%

#8d5529

Accent· 7.1%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(14)googletagmanager.com(2)gstatic.com(1)google-analytics.com(1)google.com(1)

Website Identity

yuhikaku.co.jp

Location detected: 🇯🇵 Japanvia tld

Social Profiles

YouTube

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Last analyzed: 19 May 2026 at 00:06

Historical Analysis & Change Tracking