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SGSiteGraph

kodansha.co.jp

講談社「おもしろくて、ためになる」を世界へ

Last scanned Aug 2, 2026, 5:00 AM · 9 views

83

Overall score

Great

Summary

講談社の公式ホームページ総合トップページ。講談社が出版する書籍・コミックの新刊情報、作品検索、会社情報、講談社が運営する各種サービス・コンテンツな�… This website uses Nginx behind CloudFront CDN. SEO is fair (60/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance good (80/100). Top issue: Title longer than 60 characters.

講談社の公式ホームページ総合トップページ。講談社が出版する書籍・コミックの新刊情報、作品検索、会社情報、講談社が運営する各種サービス・コンテンツなどをご紹介します。

Top issues to fix

9 issues found

  • 1 cookie without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

  • Title longer than 60 characters

    SEO

    Shorten the title to under 60 characters so search results don't truncate it.

  • Meta description longer than 160 characters

    SEO

    Trim the meta description to under 160 characters to avoid truncation in search results.

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+3 more issues — details in the sections below.

60

SEO

7 issue(s) found

80

Performance

1.05 s

100

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+1 overall since Jul 26, 2026

Overall
83
SEO
60
Security
100
Performance
80
Accessibility
100

Organization

Company details published in this site's own structured data.

講談社の公式ホームページ総合トップページ。講談社が出版する書籍・コミックの新刊情報、作品検索、会社情報、講談社が運営する各種サービス・コンテンツなどをご紹介します。

YouTubeX (Twitter)InstagramYouTube

Meta tags

Title
講談社「おもしろくて、ためになる」を世界へ
Description
講談社の公式ホームページ総合トップページ。講談社が出版する書籍・コミックの新刊情報、作品検索、会社情報、講談社が運営する各種サービス・コンテンツなどをご紹介します。
Canonical
Language
ja
Charset
UTF-8
Viewport
width=device-width,initial-scale=1
Robots meta
index,follow
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
講談社「おもしろくて、ためになる」を世界へ
og:description
講談社の公式ホームページ総合トップページ。講談社が出版する書籍・コミックの新刊情報、作品検索、会社情報、講談社が運営する各種サービス・コンテンツなどをご紹介します。
og:type
article
og:url
https://www.kodansha.co.jp

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

LaravelNginx

Hosting & CDN

Hosting provider
—
CDN provider
CloudFront
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
intcorp.kodansha.co.jp
Valid from
Jun 24, 2026
Valid to
Jan 7, 2027
Days until expiry
158
SAN domains
intcorp.kodansha.co.jp, *.intcorp.kodansha.co.jp, dvs-ebook-provider.com, *.dvs-ebook-provider.com, kodansha.co.jp, *.kodansha.co.jp

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyMissing

Compression: none · 2 cookie(s) observed

Content & assets

Headings

H1 4 · H2 11 · H3 4

Links

189 internal · 28 external · 20 broken

Images

99 total · 1 missing alt

Scripts / Styles

5 scripts · 1 stylesheets

JS / CSS size

12.9 KB · 0 B

Page size

372 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Title longer than 60 characters
  • Meta description longer than 160 characters
  • Missing canonical link
  • Multiple H1 headings found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://kodansha.co.jp
Final URL
https://www.kodansha.co.jp/
HTTP status
200
HTTP version
HTTP/2
Response time
1.04 s
HTML size
372 KB
Redirect chain
https://kodansha.co.jp → https://www.kodansha.co.jp/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does kodansha.co.jp use?
kodansha.co.jp is built with Laravel, Nginx.
Is kodansha.co.jp secure (HTTPS)?
Yes. kodansha.co.jp uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 7, 2027.
Who hosts kodansha.co.jp?
Hosting provider information for kodansha.co.jp is not available yet.
What is kodansha.co.jp's SEO score?
kodansha.co.jp scored 60/100 for SEO in the latest analysis (fair).
What is kodansha.co.jp's overall website score?
kodansha.co.jp has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
Has kodansha.co.jp's score changed over time?
kodansha.co.jp's overall score has improved by 1 point (from 82 to 83) since Jul 26, 2026.