What technology does yanmaga.jp use?

yanmaga.jp is built with Ruby on Rails, 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?

yanmaga.jp is hosted on AWS, behind CloudFront CDN.

What is yanmaga.jp's SEO score?

yanmaga.jp scored 90/100 for SEO in the latest analysis (excellent).

What is yanmaga.jp's overall website score?

yanmaga.jp has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.

yanmaga.jp

ヤンマガWeb - マンガ・グラビアが毎日無料！

Last scanned Jul 24, 2026, 10:25 PM · 1 view

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 hosted on AWS behind CloudFront CDN. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (80/100). 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。

United States

Hosted on AWS

Top issues to fix

4 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.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

SEO

2 issue(s) found

Performance

600 ms

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

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

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

Technologies

Detected frameworks, languages, and tools.

Ruby on Rails Nginx

Hosting & CDN

Hosting provider: AWS
CDN provider: CloudFront
IP address: 13.227.249.40
ASN: AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

Type	Value
A	13.227.249.40 13.227.249.4 13.227.249.37 13.227.249.101
AAAA	—
MX	—
TXT	google-site-verification=CTD8HO4gI5U97C4hraYWVWfgTgCH94KtjFh-51BURSA v=spf1 ip4:54.199.224.192 ip4:54.199.224.197 ~all
NS	ns-1015.awsdns-62.net ns-400.awsdns-50.com ns-1887.awsdns-43.co.uk ns-1533.awsdns-63.org
CAA	—
CNAME	—
IPv6 support	No

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: 180
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 84

Links

168 internal · 8 external · 0 broken

Images

214 total · 6 missing alt

Scripts / Styles

3 scripts · 1 stylesheets

JS / CSS size

825 KB · 714 KB

Page size

194 KB

Robots.txt & Sitemap

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

SEO issues

Meta description longer than 160 characters
sitemap.xml not found

Scan details

Requested URL: https://yanmaga.jp
Final URL: https://yanmaga.jp
HTTP status: 200
HTTP version: HTTP/2
Response time: 597 ms
HTML size: 194 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, 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?: yanmaga.jp is hosted on AWS, behind CloudFront CDN.
What is yanmaga.jp's SEO score?: yanmaga.jp scored 90/100 for SEO in the latest analysis (excellent).
What is yanmaga.jp's overall website score?: yanmaga.jp has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.