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SGSiteGraph

yanmaga.jp

ヤンマガWeb - マンガ・グラビアが毎日無料！

Last scanned Jul 31, 2026, 11:00 PM · 13 views

91

Overall score

Excellent

Summary

マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。. This website uses Nginx behind CloudFront CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.

マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。

Top issues to fix

6 issues found · 1 high priority

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • 2 cookies 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.

  • Meta description longer than 160 characters

    SEO

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

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

  • 20 broken links on the page

    SEO

    Fix or remove broken links — they waste crawl budget and erode user trust.

85

SEO

3 issue(s) found

90

Performance

719 ms

90

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

+1 overall since Jul 24, 2026

Overall
91
SEO
85
Security
90
Performance
90
Accessibility
100

Organization

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

マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。

X (Twitter)YouTube

Meta tags

Title
ヤンマガWeb - マンガ・グラビアが毎日無料！
Description
マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。
Canonical
https://yanmaga.jp/
Language
ja
Charset
UTF-8
Viewport
width=device-width,initial-scale=1
Robots meta
Manifest
https://yanmaga.jp/manifest.json

OpenGraph & Twitter Card

OpenGraph

og:title
ヤンマガWeb - マンガ・グラビアが毎日無料！
og:description
マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。
og:type
website
og:url
https://yanmaga.jp/

Twitter Card

twitter:card
summary_large_image
twitter:title
ヤンマガWeb - マンガ・グラビアが毎日無料！
twitter:description
マンガ・グラビアが毎日無料のヤンマガWeb公式サイトです。ヤンマガは40周年を迎え、SF、ヤンキー、ホラー・サスペンス画など様々なジャンルのマンガを配信中。

Technologies

Detected frameworks, languages, and tools.

Ruby on RailsTailwind CSSNginx

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
*.yanmaga.jp
Valid from
Dec 23, 2025
Valid to
Jan 20, 2027
Days until expiry
173
SAN domains
*.yanmaga.jp, yanmaga.jp

Security headers

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

Compression: none · 3 cookie(s) observed

Content & assets

Headings

H1 1 · H2 11 · H3 92

Links

201 internal · 8 external · 20 broken

Images

255 total · 6 missing alt

Scripts / Styles

3 scripts · 2 stylesheets

JS / CSS size

1.7 KB · 60 B

Page size

235 KB

Robots.txt & Sitemap

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

SEO issues

  • Meta description longer than 160 characters
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://yanmaga.jp
Final URL
https://yanmaga.jp
HTTP status
200
HTTP version
HTTP/2
Response time
715 ms
HTML size
235 KB
Redirect chain
https://yanmaga.jp

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does yanmaga.jp use?
yanmaga.jp is built with Ruby on Rails, Tailwind CSS, Nginx.
Is yanmaga.jp secure (HTTPS)?
Yes. yanmaga.jp uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 20, 2027.
Who hosts yanmaga.jp?
Hosting provider information for yanmaga.jp is not available yet.
What is yanmaga.jp's SEO score?
yanmaga.jp scored 85/100 for SEO in the latest analysis (great).
What is yanmaga.jp's overall website score?
yanmaga.jp has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.
Has yanmaga.jp's score changed over time?
yanmaga.jp's overall score has improved by 1 point (from 90 to 91) since Jul 24, 2026.