yellowsubmarine.co.jp

https://yellowsubmarine.co.jp· First analyzed 30 May 2026· Updated 30 May 2026

Export

Mobile

Sponsored

Hosting Provider

SAKURA

IP Address

153.120.42.11

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Osaka, Japan

ASN

AS7684

Organization

SAKURA

Server

Nginx

Nameservers

nse1.net-com.jp.nse2.net-com.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.4 s10%

Speed Index

1.8 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.7 MB

61 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

CMS

WordPress

Infrastructure

Hosting

SAKURA

Technology Stack

14 Technologies Detected

Plugins

Download Manager Foobox Image Lightbox Wp Pagenavi Soliloquy Lite

Libraries

CSS Frameworks

Icon Libraries

Fonts

Analytics

Web Servers

Languages

Customer Support

SEO Analysis

C65/100

Meta Tags8/15

Content9/12

Headings3/8

Technical23/25

E-E-A-T2/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness4/4

Mobile1/4

Indexability3/3

yellowsubmarine.co.jpyellowsubmarine.co.jp

ゲーム・ホビー商品の販売買取はイエローサブマリン｜委託販売・郵送買取も対応！

ゲーム・ホビー商品の販売買取はイエローサブマリン

Title Length38 chars

Recommended: 50-60 chars (~235px / 580px)

Description Length24 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (15/29) — critical for accessibility and SEO

10 issues found

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Crawlability

Sitemap

Type: index

19 URLs

19 sub-sitemaps

robots.txt

5 rules

Sitemap reference found

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

D43/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

7/25

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:2%

Words:208

Token eff.:Too Short

Sections/1K:57.7

Depth:2/5

Structured Data

4 JSON-LD

Organization×1.1WebSiteBreadcrumbList

sameAs entity links

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.3w

Canonical URL

Open Graph0/3

Twitter Card0/3

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.

77/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

8/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

9/15

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.

18/100

336 mg

CO₂e / view

2.7 MB

Page Weight

30%

Cleaner Than

New Visitor

384 mg

Returning (cached)

192 mg

Annual (10K/mo)

40.3 kg

Emission Segments

Data Center

75 mg

Network

81 mg

Device

180 mg

Resource Breakdown

JavaScript

183.1 KB

Images

2.4 MB

CSS

83.4 KB

Fonts

1.0 KB

HTML

13.9 KB

Green Hosting Not Verified

SAKURA

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

53d

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

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (2)

www.yellowsubmarine.co.jpyellowsubmarine.co.jp

SHA-256 Fingerprint

F2:3E:13:FB:C3:61:52:24:66:7F:32:D4:B7:0F:5E:E4:FE:46:6E:B2...

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

Sat, 30 May 2026 18:45:27 GMT

link

<https://yellowsubmarine.co.jp/wp-json/>; rel="https://api.w...

server

nginx

x-powered-by

PHP/7.4.33, PleskLin

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

cluster4a.us.messagelabs.com

cluster4.us.messagelabs.com

Domain Information

yellowsubmarine.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.

58/100

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, user-scalable=yes, maximum-scale=1.0, minimum-scale=1.0,initial-scale=1

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

游ゴシック体

WCAG Partial

54/100

Readability

/30

16/30

13px · LH 1.50

Hierarchy

/20

11/20

1x ratio · ✓ H1→H6

WCAG

/25

14/25

1:1 min contrast

Performance

/25

13/25

1 font · 1 req

Heading Font

游ゴシック体

Sans13px

Body Font

游ゴシック体

Sans13px

Contrast Ratio

1:1

19 issues

Reading Comfort

Single Font Family

left aligned

13px

26px

20px

13px

Major Second

Scale

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 19 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.

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

GGoogle Fonts Buy on MyFonts

Color Palette

11 unique colors

Light

#ffffff

Background· 54.79999999999999%

#fafa5a

Primary· 8.6%

#1496d3

Accent· 6.7%

#dde4e2

Secondary· 6.5%

#1f4069

Accent· 5.7%

#9b8a74

Secondary· 4.3%

#9b5c3d

Secondary· 3.8%

#94bfbe

Secondary· 3.8%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

yellowsubmarine.co.jp(16)cdnjs.cloudflare.com(1)google-analytics.com(1)

Website Identity

株式会社　ホビーベース　イエローサブマリン

Organization

イエローサブマリンでは、ボードゲーム・TRPG・TCG等アナログゲーム商品、プラモデル・フィギュア等ホビー商品の販売買取を行っています。委託販売や郵送買取についてもお気軽にお問い合せください。

yellowsubmarine.co.jp/

Location detected: 🇯🇵 Japanvia tld

Sponsored

Last analyzed: 30 May 2026 at 18:45

Historical Analysis & Change Tracking

yellowsubmarine.co.jp

ゲーム・ホビー商品の販売買取はイエローサブマリン｜委託販売・郵送買取も対応！

Accessibility

Carbon Footprint

Mobile Compatibility

Color Palette

株式会社 ホビーベース イエローサブマリン

株式会社　ホビーベース　イエローサブマリン