corona.co.jp

https://corona.co.jp· First analyzed 06 May 2026· Updated 06 May 2026

Export

corona.co.jp

Mobile

Sponsored

Hosting Provider

Open Computer Network

IP Address

122.17.164.125

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Osaka, Japan

ASN

AS4713

Organization

Open Computer Network

Server

Apache

Nameservers

ns-kg022.ocn.ad.jp.edp0002.corona.co.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.7 s10%

Speed Index

2.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

4.3 MB

66 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Open Computer Network

Technology Stack

9 Technologies Detected

CSS Frameworks

Analytics

Libraries

UI Components

Icon Libraries

Tag Managers

Web Servers

SEO Analysis

D48/100

Meta Tags5/15

Content7/12

Headings3/8

Technical11/21

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

corona.co.jpcorona.co.jp

株式会社コロナ

コロナは石油ファンヒーターや石油ストーブ、給湯機、エアコン、美容機器などを取り扱う総合住宅設備メーカーです。

Title Length7 chars

Recommended: 50-60 chars (~43px / 580px)

Description Length54 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

10 issues found

Upgrade to view details

Local SEO

Local Search Readiness

7/100

Poor

3 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

F36/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

0/25

Citation

9/25

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

navheader/footer

Text ratio:9%

Words:193

Token eff.:Too Short

Sections/1K:108.8

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.2w

Canonical URL

Open Graph3/3

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.

84/100

Passed

Critical

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

10/15

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

10/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•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.

8/100

542 mg

CO₂e / view

4.3 MB

Page Weight

15%

Cleaner Than

New Visitor

619 mg

Returning (cached)

310 mg

Annual (10K/mo)

65.0 kg

Emission Segments

Data Center

121 mg

Network

130 mg

Device

291 mg

Resource Breakdown

JavaScript

230.0 KB

Images

2.8 MB

CSS

1.2 MB

HTML

26.1 KB

Green Hosting Not Verified

Open Computer Network

8 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

176d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

30.09.2025

Valid Until

29.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.corona.co.jpcorona.co.jp

SHA-256 Fingerprint

85:22:85:AA:81:05:53:5B:57:33:11:63:6D:E7:33:45:79:C0:D5:90...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

connection

Keep-Alive

content-length

26459

content-type

text/html

date

Wed, 06 May 2026 16:11:26 GMT

etag

"675b-650b76ab46563"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mf.corona.co.jp

edp0002.corona.co.jp

Domain Information

corona.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

56/100

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

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Noto Sans Japanese

WCAG Partial

61/100

Readability

/30

12/30

14px · LH 1.80

Hierarchy

/20

15/20

0.8x ratio · ✓ H1→H6

WCAG

/25

13/25

1.42:1 min contrast

Performance

/25

21/25

System fonts

Heading Font

Noto Sans Japanese

Sans11px

Body Font

Noto Sans Japanese

Sans14px

Contrast Ratio

1.42:1

14 issues

Reading Comfort

~41 CPL

Narrow lines

11px

20px

16px

14px

Perfect Fourth

Scale

❌ Critical: 14px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Hard to read: Flesch score 34/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 14 elements below WCAG AA threshold (min 1.4:1).

✅ 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.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Buy on MyFontsFlesch 34

Color Palette

13 unique colors

5.64:1 AA Light

#ffffff

Background· 19.5%

#6a6760

Other· 5.3%

#bbb3a7

Primary· 10%

#867a6d

Secondary· 7.7%

#21262d

Secondary· 7.3%

#2c343d

Secondary· 7.1%

#0d3874

Accent· 6.7%

#bd9d84

Secondary· 6.4%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)googletagmanager.com(2)uh.nakanohito.jp(1)www3.gred.jp(1)google.com(1)

Website Identity

corona.co.jp

Location detected: 🇯🇵 Japanvia tld

Social Profiles

Facebook Instagram YouTube

Sponsored

Last analyzed: 06 May 2026 at 16:11

Historical Analysis & Change Tracking