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codezine.jp

https://codezine.jp· First analyzed 02 May 2026· Updated 02 May 2026
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codezine.jp
Desktop screenshot of codezine.jp
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Mobile

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Hosting Provider

IP Address

114.31.94.143

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS10021

Organization

Colt Technology Services Co., Ltd.

Server

Nginx

Nameservers

ns020-nl4cafo02sl896vi.n.d-53.jp.ns020-nl4cafo02sl896vi.n.d-53.net.ns020-nl4cafo02sl896vi.n.d-53.info.

Performance

76

Core Web Vitals

Weight

First Contentful Paint
3.0 s10%
Speed Index
3.8 s10%
Largest Contentful Paint
25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
621 KB
136 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Colt Technology Services Co., Ltd.

Technology Stack

14 Technologies Detected

SEO Analysis

D57/100
15
9
2
Meta Tags7/15
Content9/12
Headings3/8
Technical14/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social4/5
Freshness2/4
Mobile3/4
Indexability3/3
C
codezine.jpcodezine.jp

CodeZine(コードジン)

CodeZineは、株式会社翔泳社が運営するソフトウェア開発者向けのWebメディアです。「デベロッパーの成長と課題解決に貢献するメディア」をコンセプトに、現場で役立つ最新情報を日々お届けします。

Title Length15 chars

Recommended: 50-60 chars (~90px / 580px)

Description Length97 chars

Recommended: 120-160 chars

Issues (2)

  • Missing H1 tag — every page should have exactly one H1
  • Most images missing alt text (156/203) — critical for accessibility and SEO

Crawlability

Sitemap

Type: standard

30 URLs

robots.txt

4 rules

Allows all crawlers

Local SEO

Local Search Readiness

3/100
Poor
1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F37/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
10/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:4%
Words:723
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1.3w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
71/100
11
Passed
4
Critical
2
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
13/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
4 recommendations
  • Accessibility recommendation preview...

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
50/100
A
77 mg
CO₂e / view
621.4 KB
Page Weight
80%
Cleaner Than
New Visitor
88 mg
vs
Returning (cached)
44 mg
Annual (10K/mo)
9.2 kg
Emission Segments
Data Center
17 mg
Network
18 mg
Device
41 mg
Resource Breakdown
JavaScript
366.6 KB
Images
134.3 KB
CSS
1.8 KB
HTML
49.2 KB
Other
69.6 KB
Green Hosting Not Verified
Colt Technology Services Co., Ltd.
5 recommendations
  • Carbon footprint recommendation preview...
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

68d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Starfield Technologies, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

16.02.2026

Valid Until

10.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.shoeisha.co.jpshoeisha.co.jpshoeisha.jpproductzine.jpshikakuzine.jpminna-no-kurashi.jpenterprisezine.jpeczine.jp+12 more

SHA-256 Fingerprint

49:E6:EF:D2:1A:A2:00:A4:1C:75:CB:AF:AE:3D:F1:3A:14:A2:D7:EE...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

cache-control
🟣 Private(private, must-revalidate)
connection
close
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=UTF-8
date
Sat, 02 May 2026 22:05:21 GMT
server
nginx
Good Warning Issue

Email Infrastructure

Google Workspace

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt2.aspmx.l.google.com
alt1.aspmx.l.google.com
alt4.aspmx.l.google.com
alt3.aspmx.l.google.com

+1 more

Domain Information

codezine.jp

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
B
78/100
Mobile Friendly110 breakpoints
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1.0
2 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

Helvetica Neue

WCAG Partial
60/100
Readability
/30
18/30

14px · LH 1.50

Hierarchy
/20
8/20
WCAG
/25
13/25

2.62:1 min contrast

Performance
/25
21/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

2.62:1

3 issues

Reading Comfort

~47 CPL

Optimal (45–75)
24px
h2
14px
p

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~47 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 3 elements below WCAG AA threshold (min 2.6:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

Flesch 0

Color Palette

9 unique colors
Light
#ffffff
Background· 60%
#2d6fa4
Primary· 5.9%
#bf8168
Secondary· 5.8%
#071d42
Accent· 4.9%
#9ebebf
Secondary· 4.6%
#e7e5e1
Border· 3.2%
#7e3c3e
Secondary· 2.6%

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

3

User behavior and product analytics

Advertising

1

Ad platforms and retargeting pixels

Social Media

1

Social widgets and sharing tools

3

Categories

5

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Sophisticated marketing and sales technology infrastructure

Ad Networks

Google Ad Manager

Sponsored

Scripts & Styles

26 Resources

20
Scripts
6
Styles
15
Async
0
Defer

Top Script Sources

connect.facebook.net(4)googletagmanager.com(4)cdn.cxense.com(2)securepubads.g.doubleclick.net(2)api-esp-ap.piano.io(1)

Website Identity

codezine.jp

Location detected: 🇯🇵 Japanvia tld
📧 Google Workspaceja

Social Profiles

Sponsored

Last analyzed: 02 May 2026 at 22:06

Historical Analysis & Change Tracking