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c-linkage.co.jp

https://c-linkage.co.jp· First analyzed 03 May 2026· Updated 03 May 2026
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c-linkage.co.jp
Desktop screenshot of c-linkage.co.jp
Mobile screenshot of c-linkage.co.jp
Mobile

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Hosting Provider

SAKURA

IP Address

163.43.115.202

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Osaka, Japan

ASN

AS9370

Organization

SAKURA

Server

Nginx

CDN

CloudFront

Nameservers

ns2.kcrent.jp.ns1.kcrent.jp.ns3.kcrent.jp.

Performance

82

Core Web Vitals

Weight

First Contentful Paint
2.0 s10%
Speed Index
2.7 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
15.2 MB
34 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Platform
AWS CloudFront
CDN
CloudFront

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Segment

Libraries

1
jQuery

UI Components

1
Slick Carousel

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

SEO Analysis

D46/100
11
12
2
Meta Tags7/15
Content10/12
Headings3/8
Technical10/21
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
C
c-linkage.co.jpc-linkage.co.jp

HOME | Convention Linkage, Inc.

No description available for this page.

Title Length31 chars

Recommended: 50-60 chars (~184px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing H1 tag — every page should have exactly one H1

14 issues found

Upgrade to view details

Local SEO

Local Search Readiness

6/100
Poor
2 13 2

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

Sponsored

AI & LLM Readiness

F39/100
Bot Access
20/25
Machine Read.
15/25
Schema Data
0/25
Citation
4/25

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
def. listsnavheader/footer
Text ratio:14%
Words:340
Token eff.:Optimal
Sections/1K:14.7
Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary19w
Descriptive Headingsavg 2.2w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
Upgrade to view recommendations

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.
A
85/100
14
Passed
1
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
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
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •Accessibility recommendation preview...
Upgrade to view recommendations

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.
22/100
F
1.92 g
CO₂e / view
15.2 MB
Page Weight
5%
Cleaner Than
New Visitor
2.20 g
vs
Returning (cached)
1.10 g
Annual (10K/mo)
230.5 kg
Emission Segments
Data Center
429 mg
Network
461 mg
Device
1.03 g
Resource Breakdown
JavaScript
41.9 KB
Images
15.1 MB
CSS
15.2 KB
HTML
3.5 KB
Green Hosting Not Verified
SAKURA
6 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

180d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.10.2025

Valid Until

30.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.c-linkage.co.jpc-linkage.co.jp

SHA-256 Fingerprint

9F:39:58:3E:21:10:CA:42:CE:70:A9:60:1E:B3:31:26:87:13:4C:AC...

Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

content-encoding
⚡ Brotli(br)
content-type
text/html
date
Sun, 03 May 2026 02:33:33 GMT
etag
W/"69af9578-3a47"
last-modified
Tue, 10 Mar 2026 03:52:24 GMT
server
nginx
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

sgw3.mice-net.jp

Domain Information

c-linkage.co.jp

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

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.
D
55/100
Mobile Friendly1 breakpoint
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,minimum-scale=1.0
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica Neue

WCAG Partial
67/100
Readability
/30
18/30

18px · LH 1.70

Hierarchy
/20
10/20

1x ratio · ✓ H1→H6

WCAG
/25
18/25

1:1 min contrast

Performance
/25
21/25

System fonts

Heading Font

Helvetica Neue

Sans18px

Body Font

Helvetica Neue

Sans18px

Contrast Ratio

1:1

7 issues

Reading Comfort

~37 CPL

Narrow lines
18px
h1
86px
h2
40px
h3
18px
p

✅ Excellent readability: 18px body text is ideal for all devices.

❌ Very complex text: Flesch score 22/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

Fluid Type (rem)Flesch 22

Color Palette

12 unique colors
4.39:1 AA Large Light
#ffffff
Background· 20.1%
#76797a
Other· 4.3%
#758898
Secondary· 16.7%
#705e4b
Secondary· 8.3%
#22283a
Secondary· 7.5%
#554c42
Secondary· 6.8%
#30374c
Secondary· 6.4%
#111523
Primary· 4.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

10 Resources

5
Scripts
5
Styles
1
Async
0
Defer

Top Script Sources

js(3)google-analytics.com(1)slick(1)

Website Identity

c-linkage.co.jp

Location detected: 🇯🇵 Japanvia tld
en

Sponsored

Last analyzed: 03 May 2026 at 02:34

Historical Analysis & Change Tracking