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SGSiteGraph

cosumi.net

囲碁ブラウザゲーム COSUMI - 無料！

Last scanned Aug 24, 2026, 1:23 PM

89

Overall score

Great

Summary

面倒な会員登録や特別なソフトのインストール不要、ブラウザだけで今すぐ遊べる囲碁ゲームサイト。コンピュータとの対戦なので、囲碁のルールがよく分からな�… This website uses Apache hosted on SAKURA-A - SAKURA Internet Inc., JP. SEO is good (80/100) and accessibility is excellent (100/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

面倒な会員登録や特別なソフトのインストール不要、ブラウザだけで今すぐ遊べる囲碁ゲームサイト。コンピュータとの対戦なので、囲碁のルールがよく分からない方でも気軽に楽しめます。もちろん無料！

Japan
Hosted on SAKURA-A - SAKURA Internet Inc., JP

Top issues to fix

5 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.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • 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.

  • No structured data (JSON-LD) found

    SEO

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

80

SEO

3 issue(s) found

100

Performance

291 ms

80

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.

面倒な会員登録や特別なソフトのインストール不要、ブラウザだけで今すぐ遊べる囲碁ゲームサイト。コンピュータとの対戦なので、囲碁のルールがよく分からない方でも気軽に楽しめます。もちろん無料！

Meta tags

Title
囲碁ブラウザゲーム COSUMI - 無料！
Description
面倒な会員登録や特別なソフトのインストール不要、ブラウザだけで今すぐ遊べる囲碁ゲームサイト。コンピュータとの対戦なので、囲碁のルールがよく分からない方でも気軽に楽しめます。もちろん無料！
Canonical
Language
ja
Charset
UTF-8
Viewport
width=768px
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
囲碁ブラウザゲーム COSUMI - 無料！
og:description
面倒な会員登録や特別なソフトのインストール不要、ブラウザだけで今すぐ遊べる囲碁ゲームサイト。コンピュータとの対戦なので、囲碁のルールがよく分からない方でも気軽に楽しめます。もちろん無料！
og:type
website
og:url
https://www.cosumi.net/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

Google AnalyticsGoogle AdsApache

Hosting & CDN

CDN provider
—
IP address
133.242.19.15
ASN
AS7684 (SAKURA-A - SAKURA Internet Inc., JP)

DNS records

TypeValue
A
  • 133.242.19.15
AAAA—
MX—
TXT—
NS
  • ns1.dns.ne.jp
  • ns2.dns.ne.jp
CAA—
CNAME
  • cosumi.net
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Japan Registry Services Co., Ltd.
Subject
www.cosumi.net
Valid from
Aug 5, 2026
Valid to
Jan 31, 2027
Days until expiry
158
SAN domains
www.cosumi.net, cosumi.net

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 0 · H3 0

Links

19 internal · 0 external · 0 broken

Images

1 total · 0 missing alt

Scripts / Styles

9 scripts · 3 stylesheets

JS / CSS size

902 KB · 35.5 KB

Page size

14.1 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
0
sitemap.xml
Found
URLs in sitemap
25

SEO issues

  • Meta description longer than 160 characters
  • Missing canonical link
  • No structured data (JSON-LD) found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://cosumi.net
Final URL
https://www.cosumi.net/
HTTP status
200
HTTP version
HTTP/1.1
Response time
291 ms
HTML size
14.1 KB
Redirect chain
https://cosumi.net → https://www.cosumi.net/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does cosumi.net use?
cosumi.net is built with Google Analytics, Google Ads, Apache.
Is cosumi.net secure (HTTPS)?
Yes. cosumi.net uses TLS 1.3 with a certificate issued by Japan Registry Services Co., Ltd., valid until Jan 31, 2027.
Who hosts cosumi.net?
cosumi.net is hosted on SAKURA-A - SAKURA Internet Inc., JP.
What is cosumi.net's SEO score?
cosumi.net scored 80/100 for SEO in the latest analysis (great).
What is cosumi.net's overall website score?
cosumi.net has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.