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kaiseisha.co.jp

https://kaiseisha.co.jp· First analyzed 22 May 2026· Updated 22 May 2026
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kaiseisha.co.jp
Desktop screenshot of kaiseisha.co.jp
Mobile screenshot of kaiseisha.co.jp
Mobile

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Hosting Provider

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

98

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

SEO Analysis

C68/100
20
7
1
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
K
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

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...

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.
C
68/100
11
Passed
4
Critical
4
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...

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
F
552 mg
CO₂e / view
5.3 MB
Page Weight
5%
Cleaner Than
New Visitor
631 mg
vs
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...
D

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

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

90

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
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

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.
C
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...

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
h1
18px
h2
31px
h3
16px
h4
10px
p

❌ 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

2

User behavior and product analytics

Advertising

1

Ad platforms and retargeting pixels

Social Media

1

Social widgets and sharing tools

3

Categories

4

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Well-developed marketing technology stack

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Scripts & Styles

22 Resources

17
Scripts
5
Styles
8
Async
3
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

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。

Location detected: 🇯🇵 Japanvia tld
ja

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Last analyzed: 22 May 2026 at 17:58

Historical Analysis & Change Tracking