Skip to main content
SGSiteGraph

zenn.dev

Zenn｜エンジニアのための情報共有コミュニティ

Last scanned Aug 2, 2026, 1:00 PM · 7 views

86

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 behind Cloudflare CDN. SEO is fair (60/100) 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。

Top issues to fix

7 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.

  • 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.

+1 more issue — details in the sections below.

60

SEO

6 issue(s) found

100

Performance

485 ms

100

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 26, 2026

Overall
86
SEO
60
Security
100
Performance
100
Accessibility
90

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
—
CDN provider
Cloudflare
IP address
—
ASN
—

DNS records

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

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
68
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 3 · H3 6

Links

20 internal · 6 external · 20 broken

Images

13 total · 0 missing alt

Scripts / Styles

26 scripts · 6 stylesheets

JS / CSS size

148 KB · 506 B

Page size

208 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
  • No H1 heading found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

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

See something wrong on this report? Request a correction

Related websites

Same technology stack

discord.dev

Discord Developer Platform - Documentation - Discord

100
nextjsgoogle-analyticscloudflare-analytics
Cloudflare· Cloudflare

emplifyhealth.org

Emplify Health | A Little Empathy Changes Everything

100
nextjsgoogle-analyticsvue
Cloudflare· Cloudflare

cutshort.io

Cutshort: Making Top Professionals More Successful.

100
nextjsgoogle-analyticscloudflare-analytics
Cloudflare· Cloudflare

cyware.com

Cyware - AI-Powered Threat Intelligence Platform | Home

100
nextjsgoogle-analytics
AWS· Vercel

ashbyprd.com

All-in-one Recruiting Software for Ambitious Teams | Ashby

100
nextjsgoogle-analytics
AWS· Netlify

fhinck.com

Fhinck — Task Mining + Agentes de IA | AI First

100
nextjsgoogle-analytics
Fastly

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?
Hosting provider information for zenn.dev is not available yet.
What is zenn.dev's SEO score?
zenn.dev scored 60/100 for SEO in the latest analysis (fair).
What is zenn.dev's overall website score?
zenn.dev has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
Has zenn.dev's score changed over time?
zenn.dev's overall score has declined by 3 points (from 89 to 86) since Jul 26, 2026.