jokaku.jp

https://jokaku.jp· First analyzed 02 Jun 2026· Updated 02 Jun 2026

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jokaku.jp

Mobile

Sponsored

Hosting Provider

GMO Internet Group, Inc.

IP Address

157.7.107.87

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS7506

Organization

GMO Internet Group, Inc.

Server

Apache

Nameservers

uns02.lolipop.jp.uns01.lolipop.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.2 s10%

Speed Index

1.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.8 MB

57 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9.4

cms

日本城郭協会v1.0Custom

by Description:

Technology Stack

13 Technologies Detected

Libraries

Analytics

UI Components

Other

AOS (Animate On Scroll)

Other

CSS Frameworks

Fonts

Web Servers

Languages

Security

Plugins

SEO Analysis

C68/100

Meta Tags5/15

Content6/12

Headings3/8

Technical22/25

E-E-A-T2/7

Images5/7

Links4/5

URL5/5

Social5/5

Freshness4/4

Mobile4/4

Indexability3/3

jokaku.jpjokaku.jp

公益財団法人日本城郭協会

お城を通して見る歴史と文化公益財団法人日本城郭協会の公式ホームページです。

Title Length12 chars

Recommended: 50-60 chars (~74px / 580px)

Description Length38 chars

Recommended: 120-160 chars

Issues (1)

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

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

24 URLs

24 sub-sitemaps

robots.txt

Local SEO

Local Search Readiness

17/100

Poor

5 12

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

Sponsored

AI & LLM Readiness

D44/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

6/25

Citation

11/25

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.txtinvalid

llms-full.txt

Semantic HTML

Heading Hierarchy

navheader/footer

Text ratio:1%

Words:146

Token eff.:Too Short

Sections/1K:123.3

Depth:2/5

Structured Data

4 JSON-LD

Organization×1.1WebSiteBreadcrumbList

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.7w

Canonical URL

Open Graph2/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

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.

80/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

13/20

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

11/15

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.

2 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.

23/100

482 mg

CO₂e / view

3.8 MB

Page Weight

15%

Cleaner Than

New Visitor

551 mg

Returning (cached)

276 mg

Annual (10K/mo)

57.9 kg

Emission Segments

Data Center

108 mg

Network

116 mg

Device

259 mg

Resource Breakdown

JavaScript

81.3 KB

Images

584.9 KB

CSS

2.9 MB

Fonts

148.4 KB

HTML

111.9 KB

Green Hosting Not Verified

GMO Internet Group, Inc.

7 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

71%Good

Static / Informational

HTTPS

No WAF

14d

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

19.03.2026

Valid Until

17.06.2026

Subject Alternative Names (3)

jokaku.jpwork.jokaku.jpwww.jokaku.jp

SHA-256 Fingerprint

91:A3:33:4A:09:69:9B:0D:D0:28:32:BC:2B:E8:27:A6:15:5B:E9:BE...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

none

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Tue, 02 Jun 2026 21:28:57 GMT

link

<https://jokaku.jp/wp-json/>; rel="https://api.w.org/", <htt...

server

Apache

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx01.lolipop.jp

Domain Information

jokaku.jp

DNSSEC

Not Enabled

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.

67/100

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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Noto Serif JP

WCAG Partial

58/100

Readability

/30

22/30

20px · LH 1.75

Hierarchy

/20

6/20

WCAG

/25

10/25

1:1 min contrast

Performance

/25

20/25

1 font · 1 req

Heading Font

Noto Serif JP

Serif

Body Font

Noto Serif JP

Serif20px

Contrast Ratio

1:1

7 issues

Reading Comfort

Single Font Family

left aligned

59px

31px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

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

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

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

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

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

GGoogle Fonts Buy on MyFonts

Color Palette

14 unique colors

6.42:1 AA Dark

#29292f

Text· 12.5%

#b4aba7

Secondary· 6.3%

#94b3e5

Accent· 13.100000000000001%

#f7fbf1

Primary· 9.3%

#5e94de

Accent· 8.5%

#a8c1eb

Accent· 7.6%

#0b0b12

Secondary· 6.3%

#c5cbda

Secondary· 5.1%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

jokaku.jp(12)unpkg.com(2)platform.twitter.com(2)gstatic.com(1)code.jquery.com(1)

Website Identity

公益財団法人日本城郭協会

Organization

お城を通して見る歴史と文化公益財団法人日本城郭協会の公式ホームページです。

jokaku.jp/

Location detected: 🇯🇵 Japanvia tld

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 02 Jun 2026 at 21:29

Historical Analysis & Change Tracking