nact.jp

https://nact.jp· First analyzed 30 Apr 2026· Updated 30 Apr 2026

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nact.jp

Mobile

Sponsored

Hosting Provider

IIJ Internet

IP Address

210.149.81.177

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS2497

Organization

IIJ Internet

Server

Apache

Nameservers

ns013-0dr07ibqf2kh5pes.0.d-53.net.ns013-0dr07ibqf2kh5pes.0.d-53.info.ns013-0dr07ibqf2kh5pes.0.d-53.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.1 s10%

Speed Index

1.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

20.1 MB

66 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

IIJ Internet

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Icon Libraries

Analytics

Web Servers

SEO Analysis

D55/100

Meta Tags7/15

Content8/12

Headings3/8

Technical14/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness2/4

Mobile3/4

Indexability3/3

nact.jpnact.jp

国立新美術館 THE NATIONAL ART CENTER, TOKYO

No description available for this page.

Title Length37 chars

Recommended: 50-60 chars (~233px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

12 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

157 URLs

robots.txt

5 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

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

Sponsored

AI & LLM Readiness

F39/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

0/25

Citation

12/25

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:2%

Words:326

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary20w

Descriptive Headingsavg 1.8w

Canonical URL

Open Graph3/3

Twitter Card0/3

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.

77/100

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

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

7/15

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

ARIA & Roles

7/15

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.

14/100

2.54 g

CO₂e / view

20.1 MB

Page Weight

Cleaner Than

New Visitor

2.90 g

Returning (cached)

1.45 g

Annual (10K/mo)

304.7 kg

Emission Segments

Data Center

567 mg

Network

610 mg

Device

1.36 g

Resource Breakdown

JavaScript

665.2 KB

Images

19.0 MB

CSS

251.9 KB

HTML

38.8 KB

Other

96.1 KB

Green Hosting Not Verified

IIJ Internet

8 recommendations

•Carbon footprint recommendation preview...

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Security Score

56%Poor

Interactive

HTTPS

No WAF

156d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

19.03.2026

Valid Until

04.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.nact.jpnact.jp

SHA-256 Fingerprint

48:64:AE:76:8A:5F:29:18:AF:DB:E6:95:C2:C6:CF:26:F7:E1:B5:24...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

content-length

39393

content-type

text/html; charset=UTF-8

date

Thu, 30 Apr 2026 16:42:05 GMT

etag

"99e1-650a7c7048bd1"

last-modified

Thu, 30 Apr 2026 06:43:08 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.securemx.jp

Domain Information

nact.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.

75/100

Mobile Friendly49 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=1.0,minimum-scale=1.0,user-scalable=yes

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

ヒラギノ角ゴ Pro W3

WCAG Partial

64/100

Readability

/30

17/30

16px · LH 2.00

Hierarchy

/20

18/20

2x ratio · ✓ H1→H6

WCAG

/25

14/25

1.3:1 min contrast

Performance

/25

15/25

1 font · 2 req

Heading Font

ヒラギノ角ゴ Pro W3

Sans32px

Body Font

ヒラギノ角ゴ Pro W3

Sans16px

Contrast Ratio

1.3:1

7 issues

Reading Comfort

~38 CPL

Narrow lines

32px

29px

16px

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

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

⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 1.3:1).

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

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

Buy on MyFonts

Color Palette

14 unique colors

4.1:1 AA Large Light

#ffffff

Text· 11%

#6f817e

Other· 8.9%

#00020e

Primary· 12.5%

#519bed

Accent· 8.8%

#2c3a37

Secondary· 7.3%

#1687e7

Accent· 6.4%

#a0b7c5

Secondary· 6.3%

#18221e

Secondary· 5.8%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

common(4)local(1)wa.artmuseums.go.jp(1)ajax.googleapis.com(1)

Website Identity

nact.jp

Location detected: 🇯🇵 Japanvia tld

Social Profiles

Facebook X (Twitter)Instagram

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Last analyzed: 30 Apr 2026 at 16:42

Historical Analysis & Change Tracking