gacco.org

https://gacco.org· First analyzed 22 May 2026· Updated 22 May 2026

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gacco.org

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.95.113.44

Site Location

🇯🇵 Japanvia ip

Server Location

🇯🇵 Tokyo, Japan

ASN

AS16509

Organization

AWS EC2 (ap-northeast-1)

Server

OpenResty

Nameservers

ns-881.awsdns-46.net.ns-109.awsdns-13.com.ns-1206.awsdns-22.org.ns-1993.awsdns-57.co.uk.

Performance

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%

7.2 MB

109 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

6 Technologies Detected

Analytics

CSS Frameworks

Fonts

Tag Managers

Web Servers

SEO Analysis

D57/100

Meta Tags8/15

Content9/12

Headings3/8

Technical11/21

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social5/5

Freshness2/4

Mobile4/4

Indexability3/3

gacco.orggacco.org

gacco - すぐに始めてずっと続けられる動画学習サービス

gaccoとはすぐに役立つスキルからずっと役立つ教養まで、人生100年時代の学びが体験できる日本最大級の動画学習サービスです。

Title Length30 chars

Recommended: 50-60 chars (~186px / 580px)

Description Length63 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (49/59) — critical for accessibility and SEO

9 issues found

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Local SEO

Local Search Readiness

6/100

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

D45/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

11/25

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:6%

Words:428

Token eff.:Optimal

Sections/1K:95.8

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.2w

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

15/20

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

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

2/15

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.

39/100

749 mg

CO₂e / view

7.2 MB

Page Weight

Cleaner Than

New Visitor

855 mg

Returning (cached)

428 mg

Annual (10K/mo)

89.8 kg

Emission Segments

Data Center

37 mg

Network

220 mg

Device

492 mg

Resource Breakdown

JavaScript

181.4 KB

Images

6.9 MB

CSS

25.8 KB

Fonts

30.1 KB

HTML

6.4 KB

Other

146.4 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

23d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

02.06.2025

Valid Until

14.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.gacco.orggacco.org

SHA-256 Fingerprint

94:4B:92:76:4C:D8:7F:E8:36:41:75:D1:74:CC:7B:D1:CD:90:C1:C0...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-length

6229

content-type

text/html

date

Fri, 22 May 2026 06:46:54 GMT

etag

W/"69fd8f2e-7a75"

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

gacco-org.mail.protection.outlook.com

Domain Information

gacco.org

Domain Age

12y 7m

Created

08.10.2013

Expires

08.10.2027

Last Updated

20.05.2026

Registrar

Japan Registry Services Co., Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

76/100

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=1.0

Typography & Readability

游ゴシック

WCAG Partial

72/100

Readability

/30

24/30

18px · LH 1.47

Hierarchy

/20

15/20

1.07x ratio · ✓ H1→H6

WCAG

/25

13/25

1.16:1 min contrast

Performance

/25

20/25

1 font · 2 req

Heading Font

游ゴシック

Sans19px

Body Font

游ゴシック

Sans18px

Contrast Ratio

1.16:1

3 issues

Reading Comfort

~44 CPL

Narrow lines

19px

23px

19px

18px

Minor Second

Scale

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

✅ Optimal line spacing: 1.47 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 3 elements below WCAG AA threshold (min 1.2:1).

✅ 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 Buy on MyFontsFlesch 59

Color Palette

11 unique colors

Light

#ffffff

Background· 26.6%

#f0f1e7

Background· 18.400000000000002%

#cc0032

Primary· 9.6%

#b8f1f4

Accent· 8.2%

#a48c79

Secondary· 7.3%

#07070a

Secondary· 6.8%

#537474

Secondary· 6.8%

#aec8e5

Accent· 6.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(2)google-analytics.com(1)local(1)

Website Identity

gacco.org

12 years old

Location detected: 🇯🇵 Japanvia ip

Japan Registry Services Co., Ltd.📧 Microsoft 365ja

Social Profiles

Facebook X (Twitter)

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Last analyzed: 22 May 2026 at 06:47

Historical Analysis & Change Tracking