seidosha.co.jp

https://seidosha.co.jp· First analyzed 15 May 2026· Updated 15 May 2026

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seidosha.co.jp

Mobile

Sponsored

Hosting Provider

ATWORKS

IP Address

182.16.229.132

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Toyama, Japan

ASN

AS37916

Organization

ATWORKS

Server

Nginx

Nameservers

ns3.atw.jp.ns1.atw.jp.ns2.atw.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.2 s10%

Speed Index

1.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.1 MB

41 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

ATWORKS

Technology Stack

11 Technologies Detected

CSS Frameworks

Bootstrap

Tailwind CSS

Icon Libraries

Font Awesome Ionicons

Analytics

Libraries

UI Components

Fonts

Web Servers

Languages

SEO Analysis

D45/100

Meta Tags4/15

Content9/12

Headings1/8

Technical10/21

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

seidosha.co.jpseidosha.co.jp

青土社

No description available for this page.

Title Length3 chars

Recommended: 50-60 chars (~18px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (42/44) — critical for accessibility and SEO

12 issues found

Upgrade to view details

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

F27/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

5/25

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

nav

Text ratio:10%

Words:219

Token eff.:Too Short

Sections/1K:132.4

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

56/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

9/20

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

8/15

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

5 recommendations

•Accessibility recommendation preview...

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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.

38/100

137 mg

CO₂e / view

1.1 MB

Page Weight

70%

Cleaner Than

New Visitor

156 mg

Returning (cached)

78 mg

Annual (10K/mo)

16.4 kg

Emission Segments

Data Center

31 mg

Network

33 mg

Device

73 mg

Resource Breakdown

JavaScript

103.3 KB

Images

258.7 KB

CSS

737.2 KB

HTML

4.9 KB

Green Hosting Not Verified

ATWORKS

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

61d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

17.04.2026

Valid Until

16.07.2026

Subject Alternative Names (3)

seidosha.co.jpwebmail.seidosha.co.jpwww.seidosha.co.jp

SHA-256 Fingerprint

52:5A:F3:BF:21:2C:E9:2D:20:A1:25:1E:BA:64:C3:5B:76:83:95:FC...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Fri, 15 May 2026 16:30:09 GMT

server

nginx

x-powered-by

PHP/7.4.33, PleskLin

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

smtp.seidosha.co.jp

Domain Information

seidosha.co.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

59/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

ヒラギノ角ゴシック Pro W3

WCAG Partial

46/100

Readability

/30

9/30

12px · LH 1.83

Hierarchy

/20

7/20

WCAG

/25

17/25

3.5:1 min contrast

Performance

/25

13/25

1 font · 3 req

Heading Font

ヒラギノ角ゴシック Pro W3

Sans

Body Font

ヒラギノ角ゴシック Pro W3

Sans12px

Contrast Ratio

3.5:1

13 issues

Reading Comfort

Single Font Family

left aligned

24px

14px

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (1.83). 1.4–1.6 is optimal for body text.

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 3.5:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

GGoogle Fonts Buy on MyFonts

Color Palette

8 unique colors

2.3:1 Fail Light

#ffffff

Background· 63.199999999999996%

#aeaba2

Other· 3.4%

#102148

Primary· 13.100000000000001%

#e7e6df

Border· 5.1%

#c6d0ca

Border· 4.8%

#7b929f

Secondary· 3.2%

#30425d

Secondary· 3.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)google-analytics.com(1)

Website Identity

seidosha.co.jp

Location detected: 🇯🇵 Japanvia tld

Social Profiles

X (Twitter)Instagram

Sponsored

Last analyzed: 15 May 2026 at 16:30

Historical Analysis & Change Tracking