alc.co.jp

https://alc.co.jp· First analyzed 26 Apr 2026· Updated 26 Apr 2026

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alc.co.jp

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.164.206.28

Site Location

🇯🇵 Japanvia tld

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

AmazonS3

CDN

CloudFront

Nameservers

ns-667.awsdns-19.net.ns-1226.awsdns-25.org.ns-1649.awsdns-14.co.uk.ns-311.awsdns-38.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

622 ms10%

Speed Index

809 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

22.2 MB

78 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

alcCustom

Technology Stack

9 Technologies Detected

Libraries

Analytics

UI Components

Other

AOS (Animate On Scroll)

CSS Frameworks

Tailwind CSS

Fonts

Google Fonts

Tag Managers

Google Tag Manager

SEO Analysis

B72/100

Meta Tags5/15

Content9/12

Headings3/8

Technical20/21

E-E-A-T7/7

Images2/7

Links5/5

URL5/5

Social5/5

Freshness4/4

Mobile4/4

Indexability3/3

alc.co.jpalc.co.jp

株式会社アルク - 英語ならアルク

アルクは英語学習・語学教育の総合カンパニー。出版、コーチング、研修、スマホアプリ、eラーニングなど幅広いサービスで学習者のニーズに応えます

Title Length17 chars

Recommended: 50-60 chars (~105px / 580px)

Description Length69 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (75/77) — critical for accessibility and SEO

6 issues found

Upgrade to view details

Local SEO

Local Search Readiness

11/100

Poor

3 14

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

Sponsored

AI & LLM Readiness

D53/100

Bot Access

20/25

Machine Read.

5/25

Schema Data

12/25

Citation

16/25

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:3%

Words:202

Token eff.:Too Short

Sections/1K:44.6

Depth:2/5

Structured Data

6 JSON-LD

Article×1.2Person×1.3Organization×1.1WebSiteSearchAction

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.3w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (7)

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.

76/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

17/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

11/15

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

ARIA & Roles

3/15

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.

30/100

2.29 g

CO₂e / view

22.2 MB

Page Weight

Cleaner Than

New Visitor

2.62 g

Returning (cached)

1.31 g

Annual (10K/mo)

275.4 kg

Emission Segments

Data Center

112 mg

Network

674 mg

Device

1.51 g

Resource Breakdown

JavaScript

167.9 KB

Images

15.3 MB

CSS

6.7 MB

Fonts

1.1 KB

HTML

77.3 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

26%Critical

Interactive

HTTPS

WAF

184d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

13.04.2026

Valid Until

27.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

*.alc.co.jp

SHA-256 Fingerprint

3B:1E:4D:F3:20:15:A0:FC:A6:C5:58:D0:05:84:A1:F4:6E:9A:62:68...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

content-length

content-type

text/html

date

Sun, 26 Apr 2026 21:04:27 GMT

etag

"a6104d2753f21abffb075a91ff292fc0"

last-modified

Mon, 09 Nov 2020 07:48:33 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

alc-co-jp.mail.protection.outlook.com

Domain Information

alc.co.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.

74/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Noto Sans

WCAG Partial

57/100

Readability

/30

15/30

20px · LH 2.50

Hierarchy

/20

12/20

0.8x ratio · ✓ H1→H6

WCAG

/25

10/25

1:1 min contrast

Performance

/25

20/25

1 font · 2 req

Heading Font

Noto Sans

Sans16px

Body Font

Noto Sans

Sans20px

Contrast Ratio

1:1

10 issues

Reading Comfort

~36 CPL

Narrow lines

16px

53px

72px

36px

20px

Major Sixth

Scale

✅ Excellent readability: 20px body text is ideal for all devices.

⚠️ Wide line spacing (2.50). 1.4–1.6 is optimal for body text.

⚠️ 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.

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

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

GGoogle Fonts

Color Palette

11 unique colors

18.41:1 AAA Light

#ffffff

Background· 63.4%

#141415

Text· 6.2%

#309dab

Primary· 5.5%

#c38e9a

Secondary· 3.9%

#88bfc2

Secondary· 3.6%

#167cac

Accent· 2.9%

#05235d

Accent· 2.7%

#757e8e

Secondary· 2.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)googletagmanager.com(3)unpkg.com(1)sdk.form.run(1)

Website Identity

株式会社アルク

Organization

/author/alc-portalsite-admin

Location detected: 🇯🇵 Japanvia tld

📧 Microsoft 365ja

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Last analyzed: 26 Apr 2026 at 21:05

Historical Analysis & Change Tracking