sendai-c.ed.jp

https://sendai-c.ed.jp· First analyzed 22 May 2026· Updated 22 May 2026

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sendai-c.ed.jp

Mobile

Sponsored

Hosting Provider

Sendai City Board of Education

IP Address

210.163.212.10

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS4713

Organization

Sendai City Board of Education

Server

Apache

Nameservers

gryffindor.sendai-c.ed.jp.hogwarts.sendai-c.ed.jp.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

660 ms10%

Speed Index

858 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.8 MB

43 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Blogger

Technology Stack

6 Technologies Detected

Analytics

CSS Frameworks

Fonts

Web Servers

Customer Support

SEO Analysis

D55/100

Meta Tags5/15

Content6/12

Headings8/8

Technical15/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

sendai-c.ed.jpsendai-c.ed.jp

ホーム

センターからのお知らせ

Title Length3 chars

Recommended: 50-60 chars (~18px / 580px)

Description Length12 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (10/10) — critical for accessibility and SEO

9 issues found

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Crawlability

Sitemap

robots.txt

5 rules

Local SEO

Local Search Readiness

8/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

F31/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

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

nav

Text ratio:1%

Words:176

Token eff.:Too Short

Depth:1/5

Structured Data

Microdata

Citation Readiness

Opening Summary2199w

Descriptive Headingsavg 1.1w

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

76/100

Passed

Critical

Warnings

Images & Alt Text

3/20

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

12/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

15/15

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

ARIA & Roles

11/15

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.

28/100

229 mg

CO₂e / view

1.8 MB

Page Weight

50%

Cleaner Than

New Visitor

262 mg

Returning (cached)

131 mg

Annual (10K/mo)

27.5 kg

Emission Segments

Data Center

51 mg

Network

55 mg

Device

123 mg

Resource Breakdown

JavaScript

6.0 KB

Images

1.8 MB

Fonts

4.8 KB

HTML

42.5 KB

Other

1.0 KB

Green Hosting Not Verified

Sendai City Board of Education

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

69d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

07.05.2026

Valid Until

30.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

*.google.com*.appengine.google.com*.bdn.dev*.origin-test.bdn.dev*.cloud.google.com*.crowdsource.google.com*.datacompute.google.com*.google.ca+12 more

SHA-256 Fingerprint

16:A1:EB:63:D1:FC:CC:47:80:09:5E:C3:61:20:56:39:EC:CA:BA:D6...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

Keep-Alive

content-length

2417

content-type

text/html

date

Fri, 22 May 2026 12:21:37 GMT

etag

"971-61b0fa02a32c1"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

gryffindor.sendai-c.ed.jp

Domain Information

sendai-c.ed.jp

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

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.

68/100

Mobile Friendly44 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, initial-scale=1

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Lato

WCAG Partial

71/100

Readability

/30

18/30

15px · LH 1.67

Hierarchy

/20

16/20

5.82x ratio · ✓ H1→H6

WCAG

/25

17/25

1:1 min contrast

Performance

/25

20/25

1 font · 3 req

Heading Font

Lato

Sans85px

Body Font

Lato

Sans15px

Contrast Ratio

1:1

10 issues

Reading Comfort

~40 CPL

Narrow lines

85px

33px

20px

15px

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 5.8x larger than body text.

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

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

GGoogle Fonts Buy on MyFonts

Color Palette

8 unique colors

16.13:1 AAA Light

#ffffff

Background· 28.400000000000002%

#21211f

Text· 11.5%

#1e6c93

Primary· 21.500000000000004%

#554b42

Secondary· 17.299999999999997%

#33566b

Secondary· 6%

#bbc9ce

Secondary· 4.8%

#497e98

Secondary· 3.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

gstatic.com(4)apis.google.com(2)googletagmanager.com(1)

Website Identity

sendai-c.ed.jp

Location detected: 🇯🇵 Japanvia tld

en-US

Sponsored

Last analyzed: 22 May 2026 at 12:22

Historical Analysis & Change Tracking