kaiseisha.co.jp

https://kaiseisha.co.jp· First analyzed 22 May 2026· Updated 22 May 2026

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kaiseisha.co.jp

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.249.158.38

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS16509

Organization

AWS EC2 (ap-northeast-1)

Server

Nginx

Nameservers

nsx2.clara.co.jp.ns.kaiseisha.co.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

898 ms10%

Speed Index

1.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

5.3 MB

103 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.8.1

cms

Kaiseishav1.0Custom

View Theme

Technology Stack

9 Technologies Detected

Analytics

Plugins

Contact Form 7 Multi Step Module

Libraries

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

C68/100

Meta Tags7/15

Content8/12

Headings3/8

Technical23/25

E-E-A-T2/7

Images5/7

Links4/5

URL5/5

Social5/5

Freshness0/4

Mobile3/4

Indexability3/3

kaiseisha.co.jpkaiseisha.co.jp

偕成社 | 児童書出版社

児童書出版・偕成社のサイトへようこそ！新刊情報、本の検索をはじめ、人気のキャラクターの紹介、ウェブ連載、イベント情報、プレゼント情報など、楽しいコンテンツがもりだくさんです。

Title Length12 chars

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

Description Length87 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

8 issues found

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Crawlability

Sitemap

Type: index

15 URLs

15 sub-sitemaps

robots.txt

6 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100

Poor

4 13

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

Sponsored

AI & LLM Readiness

D46/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

7/25

Citation

11/25

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.txtinvalid

llms-full.txt

Semantic HTML

Heading Hierarchy

blockquotesheader/footer

Text ratio:1%

Words:297

Token eff.:Too Short

Sections/1K:16.8

Depth:2/5

Structured Data

4 JSON-LD

Organization×1.1WebSiteBreadcrumbList

sameAs entity links

Citation Readiness

Opening Summary57w

Descriptive Headingsavg 2.5w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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Sponsored

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.

68/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

17/20

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

Forms & Inputs

2/15

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

7/15

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

ARIA & Roles

7/15

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

3 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.

26/100

552 mg

CO₂e / view

5.3 MB

Page Weight

Cleaner Than

New Visitor

631 mg

Returning (cached)

316 mg

Annual (10K/mo)

66.3 kg

Emission Segments

Data Center

27 mg

Network

162 mg

Device

363 mg

Resource Breakdown

JavaScript

127.1 KB

Images

5.0 MB

CSS

177.9 KB

HTML

24.1 KB

Other

10.3 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

No WAF

69d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

02.05.2026

Valid Until

31.07.2026

Subject Alternative Names (2)

kaiseisha.co.jpwww.kaiseisha.co.jp

SHA-256 Fingerprint

0F:C0:A2:26:48:8C:AB:49:42:3E:3B:08:A8:8A:E9:7E:7F:2C:81:8F...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=2592000

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Fri, 22 May 2026 17:57:47 GMT

link

<https://www.kaiseisha.co.jp/wp-json/>; rel="https://api.w.o...

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

host.kaiseisha.co.jp.at.ah.clara.ne.jp

mail02.kaiseisha.co.jp

Domain Information

kaiseisha.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

67/100

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.

Viewport

width=device-width, initial-scale=1.0

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG Partial

67/100

Readability

/30

16/30

10px · LH 1.80

Hierarchy

/20

12/20

0.1x ratio · ✓ H1→H6

WCAG

/25

18/25

1.07:1 min contrast

Performance

/25

21/25

System fonts

Heading Font

Helvetica Neue

Sans1px

Body Font

Helvetica Neue

Sans10px

Contrast Ratio

1.07:1

8 issues

Reading Comfort

~65 CPL

Optimal (45–75)

1px

18px

31px

16px

10px

❌ Critical: 10px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line length: ~65 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.1:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

Fluid Type (rem)

Color Palette

5 unique colors

Light

#faf7f0

Primary· 58.09999999999999%

#e6e2d0

Secondary· 13.1%

#a7b9bb

Secondary· 11.5%

#a08d82

Secondary· 11%

#f9ebbd

Accent· 6.2%

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

kaiseisha.co.jp(6)googletagmanager.com(3)connect.facebook.net(2)gstatic.com(1)google-analytics.com(1)

Website Identity

偕成社 | 児童書出版社

Organization

www.kaiseisha.co.jp/

Location detected: 🇯🇵 Japanvia tld

Social Profiles

Facebook X (Twitter)Instagram YouTube

Sponsored

Last analyzed: 22 May 2026 at 17:58

Historical Analysis & Change Tracking