youngjump.jp

https://youngjump.jp· First analyzed 08 May 2026· Updated 08 May 2026

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youngjump.jp

Mobile

Sponsored

Hosting Provider

Impress Holdings, Inc.

IP Address

202.218.223.142

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 tabashi City, Japan

ASN

AS4694

Organization

Impress Holdings, Inc.

Server

Apache

Nameservers

ns-1517.awsdns-61.org.ns-1560.awsdns-03.co.uk.ns-287.awsdns-35.com.ns-640.awsdns-16.net.

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%

3.7 MB

129 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Impress Holdings, Inc.

Technology Stack

3 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Web Servers

Apache

SEO Analysis

C60/100

Meta Tags5/15

Content10/12

Headings8/8

Technical9/25

E-E-A-T3/7

Images2/7

Links5/5

URL5/5

Social4/5

Freshness2/4

Mobile4/4

Indexability3/3

youngjump.jpyoungjump.jp

週刊ヤングジャンプ公式サイト

毎週木曜日発売。集英社の青年コミック誌『週刊ヤングジャンプ』の公式サイト。

Title Length14 chars

Recommended: 50-60 chars (~86px / 580px)

Description Length37 chars

Recommended: 120-160 chars

Issues (1)

• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

10 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

37 rules

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

F39/100

Bot Access

13/25

Machine Read.

14/25

Schema Data

0/25

Citation

12/25

AI Bot Access

7/14 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

def. listsnavheader/footer

Text ratio:8%

Words:427

Token eff.:Optimal

Sections/1K:96

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 2.1w

Canonical URL

Open Graph3/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

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.

67/100

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

12/15

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

1/15

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.

4/100

465 mg

CO₂e / view

3.7 MB

Page Weight

15%

Cleaner Than

New Visitor

531 mg

Returning (cached)

266 mg

Annual (10K/mo)

55.8 kg

Emission Segments

Data Center

104 mg

Network

112 mg

Device

249 mg

Resource Breakdown

JavaScript

247.1 KB

Images

3.3 MB

CSS

61.9 KB

HTML

55.0 KB

Other

2.7 KB

Green Hosting Not Verified

Impress Holdings, Inc.

8 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

81%Very Good

Static / Informational

HTTPS

No WAF

58d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

07.04.2026

Valid Until

06.07.2026

Subject Alternative Names (2)

*.youngjump.jpyoungjump.jp

SHA-256 Fingerprint

AC:79:71:6C:16:19:20:CF:EA:6F:A4:80:26:B4:B5:B6:40:CF:B0:C7...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-type

text/html

date

Fri, 08 May 2026 17:13:17 GMT

server

Apache

x-frame-options

SAMEORIGIN

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

aspmx2.googlemail.com

alt2.aspmx.l.google.com

aspmx3.googlemail.com

aspmx4.googlemail.com

+3 more

Domain Information

youngjump.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.

27/100

Not 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.

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

YuGothic

WCAG AA

63/100

Readability

/30

14/30

11px · LH 1.50

Hierarchy

/20

14/20

0.91x ratio · ✓ H1→H6

WCAG

/25

21/25

4.94:1 min contrast

Performance

/25

14/25

1 font

Heading Font

YuGothic

Sans10px

Body Font

YuGothic

Sans11px

Contrast Ratio

4.94:1

WCAG AA (≥4.5:1)

Reading Comfort

~159 CPL

Too wide

10px

16px

15px

11px

Major Third

Scale

❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

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

❌ Very long lines: ~159 chars/line causes eye strain. Add max-width constraint.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.9:1).

✅ 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.

Buy on MyFontsFlesch 66

Color Palette

11 unique colors

Light

#ffffff

Text· 12.4%

#0062c7

Primary· 13.5%

#66523a

Secondary· 7.9%

#faf353

Accent· 7.8%

#ddc5a4

Secondary· 4.6%

#84c0b1

Secondary· 4.3%

#5f90a7

Secondary· 4.2%

#e6e7d9

Secondary· 3.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

common(6)googletagmanager.com(4)s.yimg.jp(3)assets(2)local(2)

Website Identity

youngjump.jp

Location detected: 🇯🇵 Japanvia tld

📧 Google Workspaceja

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 08 May 2026 at 17:13

Historical Analysis & Change Tracking