sejuku.net

https://sejuku.net· First analyzed 14 May 2026· Updated 14 May 2026

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sejuku.net

Mobile

Sponsored

Hosting Provider

XSERVER Inc.

IP Address

157.112.147.190

Site Location

🇯🇵 Japanvia ip

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS131965

Organization

XSERVER Inc.

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

micah.ns.cloudflare.com.dorthy.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.0 s10%

Speed Index

1.3 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.2 MB

165 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

SWELLv2.14.0Custom

by LOOS,Inc.

View Theme

Technology Stack

17 Technologies Detected

Advertising

Google Ads Google AdSense Twitter Ads TikTok Pixel Microsoft Advertising Taboola

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Microsoft Clarity

Libraries

Other

CSS Frameworks

Tag Managers

Web Servers

Customer Support

Plugins

SEO Analysis

B70/100

Meta Tags11/15

Content3/12

Headings8/8

Technical23/25

E-E-A-T2/7

Images3/7

Links5/5

URL5/5

Social4/5

Freshness0/4

Mobile3/4

Indexability3/3

sejuku.netsejuku.net

侍エンジニア | プログラミングスクールで日本初の専属マンツーマン指導

SAMURAI ENGINEER（侍エンジニア）は日本初の専属マンツーマン指導が特徴のプログラミングスクールです。あなただけのオリジナルカリキュラムで最適な学習が可能。徹底したサポート体制で、挫折せず目標達成に導きます。

Title Length35 chars

Recommended: 50-60 chars (~214px / 580px)

Description Length110 chars

Recommended: 120-160 chars

Issues (2)

• Very thin content (3 words). Search engines need substantial content for ranking.
• Most images missing alt text (104/128) — critical for accessibility and SEO

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

22 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100

Poor

4 13

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

Sponsored

AI & LLM Readiness

D41/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

7/25

Citation

7/25

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

Text ratio:1%

Words:438

Token eff.:Optimal

Structured Data

2 JSON-LD

Organization×1.1WebSiteSearchAction

sameAs entity links

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

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.

83/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

18/20

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

9/15

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.

1 recommendation

•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.

42/100

150 mg

CO₂e / view

1.2 MB

Page Weight

70%

Cleaner Than

New Visitor

172 mg

Returning (cached)

86 mg

Annual (10K/mo)

18.0 kg

Emission Segments

Data Center

34 mg

Network

36 mg

Device

81 mg

Resource Breakdown

JavaScript

483.7 KB

Images

104.5 KB

CSS

535.1 KB

HTML

88.8 KB

Other

1.5 KB

Green Hosting Not Verified

XSERVER Inc.

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Interactive

HTTPS

No WAF

81d

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

05.05.2026

Valid Until

03.08.2026

Subject Alternative Names (2)

sejuku.netwww.sejuku.net

SHA-256 Fingerprint

23:06:CC:EC:D6:C0:66:05:90:A4:1D:AF:E4:AB:4A:30:39:9E:76:C0...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-security-policy

upgrade-insecure-requests

content-type

text/html; charset=UTF-8

date

Thu, 14 May 2026 03:45:57 GMT

link

<https://www.sejuku.net/wp-json/>; rel="https://api.w.org/",...

server

nginx

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

aspmx.l.google.com

aspmx2.googlemail.com

aspmx3.googlemail.com

alt1.aspmx.l.google.com

+1 more

Domain Information

sejuku.net

Domain Age

12y 7m

Created

26.09.2013

Expires

26.09.2026

Last Updated

13.05.2026

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

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.

78/100

Mobile Friendly83 breakpoints

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, viewport-fit=cover

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Raleway + Helvetica Neue

WCAG Partial

60/100

Readability

/30

16/30

18px · LH 2.00

Hierarchy

/20

10/20

0.45x ratio

WCAG

/25

12/25

1:1 min contrast

Performance

/25

22/25

System fonts

Heading Font

Raleway

Sans8px

Body Font

Helvetica Neue

Sans18px

Contrast Ratio

1:1

9 issues

Reading Comfort

~42 CPL

Narrow lines

8px

32px

29px

19px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

Buy on MyFontsFlesch 0

Color Palette

4 unique colors

Light

#bfbfbf

Other· 72.2%

#dcbfbd

Primary· 0.3%

Business & Marketing Stack

6 Tools Detected

Enterprise

CRM Systems

SalesforceEnterprise

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Microsoft ClarityFree

User behavior and product analytics

Advertising

TikTok PixelMid-Market

TaboolaMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(8)cdn.taboola.com(4)analytics.tiktok.com(2)s.yimg.jp(2)pi.pardot.com(1)

Website Identity

SAMURAI

Organization

lp.sejuku.net/

12 years old

Location detected: 🇯🇵 Japanvia ip

Amazon Registrar, Inc.📧 Google Workspaceja

Social Profiles

YouTube

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Last analyzed: 14 May 2026 at 03:46

Historical Analysis & Change Tracking