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zenn.dev

Zenn｜エンジニアのための情報共有コミュニティ

Last scanned Jul 26, 2026, 5:17 AM · 1 view

89

Overall score

Great

Summary

Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。. This website uses Next.js hosted on Cloudflare behind Cloudflare CDN. SEO is fair (70/100) and accessibility is excellent (90/100). Security scores excellent (100/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。

United States
Hosted on Cloudflare

Top issues to fix

4 issues found · 1 high priority

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • 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.

  • No structured data (JSON-LD) found

    SEO

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

70

SEO

4 issue(s) found

100

Performance

446 ms

100

Security

HTTPS & header checks

90

Accessibility

1 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.

Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。

X (Twitter)GitHub

Meta tags

Title
Zenn｜エンジニアのための情報共有コミュニティ
Description
Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。
Canonical
https://zenn.dev/
Language
ja
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest
https://zenn.dev/manifest.json

OpenGraph & Twitter Card

OpenGraph

og:title
Zenn｜エンジニアのための情報共有コミュニティ
og:description
Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。
og:type
article
og:url
https://zenn.dev/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

Next.jsGoogle Analytics

Hosting & CDN

Hosting provider
Cloudflare
CDN provider
Cloudflare
IP address
172.67.72.220
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 172.67.72.220
  • 104.26.15.203
  • 104.26.14.203
AAAA
  • 2606:4700:20::681a:fcb
  • 2606:4700:20::ac43:48dc
  • 2606:4700:20::681a:ecb
MX
  • alt4.aspmx.l.google.com
  • aspmx.l.google.com
  • alt3.aspmx.l.google.com
  • alt1.aspmx.l.google.com
  • alt2.aspmx.l.google.com
TXT
  • google-site-verification=udMf6x_Z0J82_tdCFgcpik-TNvh-LZk15yyd7oD2PCo
  • v=spf1 include:_spf.google.com ~all
  • google-site-verification=BViXpCnxS81SVVVCJ9B2q0122hOaPKM8QePvwyYOJaA
NS
  • gabriel.ns.cloudflare.com
  • susan.ns.cloudflare.com
CAA
  • 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  • 0 issuewild "ssl.com"
  • 0 issuewild "letsencrypt.org"
  • 0 issue "digicert.com; cansignhttpexchanges=yes"
  • 0 issue "pki.goog; cansignhttpexchanges=yes"
  • 0 issue "letsencrypt.org"
  • 0 issue "ssl.com"
  • 0 issuewild "pki.goog; cansignhttpexchanges=yes"
  • 0 issuewild "comodoca.com"
  • 0 issue "comodoca.com"
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Google Trust Services
Subject
zenn.dev
Valid from
Jul 12, 2026
Valid to
Oct 10, 2026
Days until expiry
75
SAN domains
zenn.dev, *.zenn.dev

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 2 · H3 4

Links

17 internal · 6 external · 0 broken

Images

1 total · 0 missing alt

Scripts / Styles

27 scripts · 6 stylesheets

JS / CSS size

132 KB · 506 B

Page size

182 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
9
sitemap.xml
Found
URLs in sitemap
-1

SEO issues

  • Title longer than 60 characters
  • Meta description longer than 160 characters
  • No H1 heading found
  • No structured data (JSON-LD) found

Accessibility issues

  • No H1 heading found

Careers

View careers page

This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.

Scan details

Requested URL
https://zenn.dev
Final URL
https://zenn.dev
HTTP status
200
HTTP version
HTTP/2
Response time
443 ms
HTML size
182 KB
Redirect chain
https://zenn.dev

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does zenn.dev use?
zenn.dev is built with Next.js, Google Analytics.
Is zenn.dev secure (HTTPS)?
Yes. zenn.dev uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 10, 2026.
Who hosts zenn.dev?
zenn.dev is hosted on Cloudflare, behind Cloudflare CDN.
What is zenn.dev's SEO score?
zenn.dev scored 70/100 for SEO in the latest analysis (fair).
What is zenn.dev's overall website score?
zenn.dev has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.
Is zenn.dev hiring?
zenn.dev has a careers page; check it directly for current openings.