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osakacastle.net

https://osakacastle.net· First analyzed 04 May 2026· Updated 04 May 2026
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osakacastle.net
Desktop screenshot of osakacastle.net
Mobile screenshot of osakacastle.net
Mobile

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Hosting Provider

XSERVER Inc.

IP Address

183.181.86.63

Site Location

🇯🇵 Osaka, Japanvia schema_nap

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS131965

Organization

XSERVER Inc.

Server

Nginx

Nameservers

ns3.xserver.jp.ns4.xserver.jp.ns1.xserver.jp.ns2.xserver.jp.+1 more

Performance

96

Core Web Vitals

Weight

First Contentful Paint
1.1 s10%
Speed Index
1.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
9.3 MB
95 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
XSERVER Inc.

Technology Stack

8 Technologies Detected

Libraries

2
jQueryv3.5.1
Moment.js

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

C63/100
17
8
1
Meta Tags7/15
Content9/12
Headings3/8
Technical14/21
E-E-A-T2/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness2/4
Mobile4/4
Indexability3/3
O
osakacastle.netosakacastle.net

大阪城天守閣

大阪城天守閣は、豊臣時代・徳川時代に続く3代目のもので、昭和6年（1931）市民の寄付金によって復興されました。現在まで90年以上の歴史を刻み、国の登録文化財にも指定されています。

Title Length6 chars

Recommended: 50-60 chars (~37px / 580px)

Description Length90 chars

Recommended: 120-160 chars

Issues (1)

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

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

Local SEO

Local Search Readiness

34/100
Needs Work
9 11

Sponsored

AI & LLM Readiness

D52/100
Bot Access
20/25
Machine Read.
20/25
Schema Data
2/25
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.txtinvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
def. listsnavheader/footer
Text ratio:11%
Words:405
Token eff.:Optimal
Sections/1K:14.8
Depth:3/5

Structured Data

1 JSON-LD
Organization×1.1

Citation Readiness

Opening Summary
Descriptive Headingsavg 2.3w
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
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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.
C
68/100
10
Passed
2
Critical
1
Warnings
Images & Alt Text
15/20
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
5/15
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
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 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.
25/100
F
1.18 g
CO₂e / view
9.3 MB
Page Weight
5%
Cleaner Than
New Visitor
1.35 g
vs
Returning (cached)
674 mg
Annual (10K/mo)
141.6 kg
Emission Segments
Data Center
264 mg
Network
283 mg
Device
633 mg
Resource Breakdown
JavaScript
120.8 KB
Images
1.3 MB
CSS
7.8 MB
Fonts
89.6 KB
HTML
4.5 KB
Other
17.1 KB
Green Hosting Not Verified
XSERVER Inc.
7 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

78d

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

22.04.2026

Valid Until

21.07.2026

Subject Alternative Names (2)

osakacastle.netwww.osakacastle.net

SHA-256 Fingerprint

FA:74:15:6B:24:BD:3C:E1:DE:90:40:61:B5:A5:79:C0:DC:88:5C:4C...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
⚡ Brotli(br)
content-type
text/html
date
Mon, 04 May 2026 18:11:27 GMT
etag
W/"373b-6418cbe853465"
last-modified
Mon, 20 Oct 2025 01:10:07 GMT
server
nginx
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

50

SPF
DKIM
DMARC

MX Records (1)

osakacastle-net.mail.protection.outlook.com

Domain Information

osakacastle.net

Domain Age
21y 2m

Created

02.03.2005

Expires

02.03.2027

Last Updated

20.01.2026

Registrar

XServer, Inc.

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.
C
61/100
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, shrink-to-fit=no, user-scalable=0
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

ヒラギノ明朝 ProN W3

WCAG Fail
55/100
Readability
/30
16/30

14px · LH 2.86

Hierarchy
/20
9/20

1x ratio · ✓ H1→H6

WCAG
/25
10/25

1.14:1 min contrast

Performance
/25
20/25

2 fonts · 2 req

Heading Font

ヒラギノ明朝 ProN W3

Sans14px

Body Font

ヒラギノ明朝 ProN W3

Sans14px

Contrast Ratio

1.14:1

40 issues

Reading Comfort

~46 CPL

Optimal (45–75)
14px
h1
30px
h2
14px
p

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

⚠️ Wide line spacing (2.86). 1.4–1.6 is optimal for body text.

✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

❌ Low contrast: 40 elements fail WCAG AA (min 1.1:1). Increase text/background contrast.

✅ 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.

GGoogle FontsBuy on MyFonts

Color Palette

13 unique colors
8.59:1 AAA Dark
#000000
Background· 19.3%
#a4a79c
Other· 5%
#e3edfa
Primary· 14.1%
#7ed8fd
Accent· 9.9%
#82c5d8
Accent· 7.5%
#b8defc
Accent· 7%
#fdfefd
Secondary· 7%
#3b3b27
Secondary· 6.9%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

18 Resources

15
Scripts
3
Styles
4
Async
0
Defer

Top Script Sources

local(6)cdnjs.cloudflare.com(3)googletagmanager.com(2)ajax.googleapis.com(1)ssl.google-analytics.com(1)

Website Identity

大阪城天守閣

大阪城天守閣

Organization
06-6941-3044
www.osakacastle.net/
21 years old

大阪市中央区大阪城1-1, Osaka

540-0002, Osaka

Japan

Location detected: 🇯🇵 Japan, Osakavia schema_nap
XServer, Inc.📧 Microsoft 365ja

Social Profiles

X (Twitter)YouTube

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Last analyzed: 04 May 2026 at 18:12

Historical Analysis & Change Tracking