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seg.co.jp

https://seg.co.jp· First analyzed 02 Jun 2026· Updated 02 Jun 2026
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seg.co.jp
Desktop screenshot of seg.co.jp
Mobile screenshot of seg.co.jp
Mobile

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Hosting Provider

SAKURA Internet Inc.

IP Address

153.127.10.250

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Osaka, Japan

ASN

AS7684

Organization

SAKURA Internet Inc.

Server

Nginx

Nameservers

ik1-403-33746.vs.sakura.ne.jp.ns1.dns.ne.jp.ns2.dns.ne.jp.

Performance

92

Core Web Vitals

Weight

First Contentful Paint
1.3 s10%
Speed Index
1.7 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
69 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv5.4.19
cms
SEG Officialv1.0Custom

Technology Stack

7 Technologies Detected

Analytics

2
Google Analytics
Segment

Libraries

1
jQueryv3.4.1

UI Components

1
Slick Carousel

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginxv1.16.1

Languages

1
PHPv7.2.30

SEO Analysis

D55/100
14
9
1
Meta Tags8/15
Content9/12
Headings3/8
Technical15/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
S
seg.co.jpseg.co.jp

科学的教育グループSEG

科学的教育グループSEGのページです。「心に広がる数学の世界を！　多読・多聴で生きた英語を！」 中1～高3・高卒生を対象にした、大学受験の学習塾です。東大をはじめ難関大学の合格を目指す方が多く通っています。

Title Length12 chars

Recommended: 50-60 chars (~77px / 580px)

Description Length103 chars

Recommended: 120-160 chars

Issues (1)

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

10 issues found

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Crawlability

Sitemap
robots.txt

3 rules

Local SEO

Local Search Readiness

18/100
Poor
5 10 2

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

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AI & LLM Readiness

D42/100
Bot Access
20/25
Machine Read.
14/25
Schema Data
0/25
Citation
8/25

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
def. listsnavheader/footer
Text ratio:5%
Words:379
Token eff.:Optimal
Sections/1K:18.5
Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1.4w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
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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.
A
80/100
13
Passed
3
Critical
1
Warnings
Images & Alt Text
20/20
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
14/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
7/15
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.
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.
36/100
C
161 mg
CO₂e / view
1.3 MB
Page Weight
70%
Cleaner Than
New Visitor
184 mg
vs
Returning (cached)
92 mg
Annual (10K/mo)
19.3 kg
Emission Segments
Data Center
36 mg
Network
39 mg
Device
86 mg
Resource Breakdown
JavaScript
155.7 KB
Images
787.3 KB
CSS
345.2 KB
HTML
11.9 KB
Green Hosting Not Verified
SAKURA Internet Inc.
5 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

31%Critical
Interactive

HTTPS

No WAF

70d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

14.05.2026

Valid Until

12.08.2026

Subject Alternative Names (2)

seg.co.jpwww.seg.co.jp

SHA-256 Fingerprint

67:0F:FD:EB:C4:EA:8C:30:80:21:58:74:59:17:54:0F:7E:F7:2D:62...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=UTF-8
date
Tue, 02 Jun 2026 20:09:58 GMT
link
<https://www.seg.co.jp/wp-json/>; rel="https://api.w.org/", ...
server
nginx/1.16.1
x-frame-options
SAMEORIGIN
Good Warning Issue

Email Infrastructure

Google Workspace

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

smtp.google.com

Domain Information

seg.co.jp

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
63/100
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
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Noto Sans JP

WCAG Partial
63/100
Readability
/30
22/30

16px · LH 1.63

Hierarchy
/20
12/20

1x ratio · ✓ H1→H6

WCAG
/25
14/25

1.76:1 min contrast

Performance
/25
15/25

2 fonts · 1 req

Heading Font

Noto Sans JP

Sans16px

Body Font

Noto Sans JP

Sans16px

Contrast Ratio

1.76:1

25 issues

Reading Comfort

~46 CPL

Optimal (45–75)
16px
h1
40px
h2
40px
h3
22px
h4
16px
p
Perfect Fourth
Scale

✅ Excellent readability: 16px body text is ideal for all devices.

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

⚠️ Partial contrast: 25 elements below WCAG AA threshold (min 1.8:1).

✅ 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: 2 font families keeps load times fast.

Buy on MyFonts

Color Palette

12 unique colors
Light
#0477d1
Primary· 24.2%
#e3ebf6
Background· 17.7%
#80bae7
Accent· 12.8%
#fcfdfe
Primary· 10.7%
#b9d2ea
Accent· 7.8%
#67a8e8
Primary· 7.7%
#4b9fe6
Accent· 6.9%
#2097e2
Accent· 4.6%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

Social Media

1
Twitter/X WidgetsFree

Social widgets and sharing tools

2

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

22 Resources

16
Scripts
6
Styles
1
Async
1
Defer

Top Script Sources

seg.co.jp(11)platform.twitter.com(2)google-analytics.com(1)ajaxzip3.github.io(1)cdnjs.cloudflare.com(1)

Website Identity

seg.co.jp

0333661466

Copyright © 2019 Scientific Education Group Co.,Ltd. All Rights Reserved.

Location detected: 🇯🇵 Japanvia tld
📧 Google Workspaceja

Social Profiles

X (Twitter)

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Last analyzed: 02 Jun 2026 at 20:10

Historical Analysis & Change Tracking