nitroplus.co.jp

https://nitroplus.co.jp· First analyzed 13 May 2026· Updated 13 May 2026

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nitroplus.co.jp

Mobile

Sponsored

Hosting Provider

Architectural Systems Inc.

IP Address

133.242.64.55

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS7684

Organization

Architectural Systems Inc.

Server

Apache

Nameservers

ns2.dns.ne.jp.ns1.dns.ne.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.0 s10%

Speed Index

2.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.8 MB

79 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Architectural Systems Inc.

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

7 Technologies Detected

UI Components

Analytics

Libraries

CSS Frameworks

Web Servers

SEO Analysis

D55/100

Meta Tags11/15

Content6/12

Headings0/8

Technical16/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social4/5

Freshness0/4

Mobile4/4

Indexability3/3

nitroplus.co.jpnitroplus.co.jp

ニトロプラス公式サイト NITRO PLUS Official Site

ゲーム・アニメ・小説・イラストなど、ジャンルやプラットフォームにとらわれないコンテンツ作りを手掛ける「ニトロプラス(NITRO PLUS)」公式サイト。最新ニュース、ゲーム紹介、製品サポート、イベント・グッズ情報、スタッフブログなど。

Title Length36 chars

Recommended: 50-60 chars (~217px / 580px)

Description Length117 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (34/51) — critical for accessibility and SEO

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

8 rules

Local SEO

Local Search Readiness

11/100

Poor

3 12 2

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

Sponsored

AI & LLM Readiness

F35/100

Bot Access

20/25

Machine Read.

3/25

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

def. lists

Text ratio:6%

Words:134

Token eff.:Too Short

Sections/1K:14.9

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary14w

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (10)

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.

79/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

11/20

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

9/15

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.

15/100

228 mg

CO₂e / view

1.8 MB

Page Weight

50%

Cleaner Than

New Visitor

261 mg

Returning (cached)

131 mg

Annual (10K/mo)

27.4 kg

Emission Segments

Data Center

51 mg

Network

55 mg

Device

123 mg

Resource Breakdown

JavaScript

272.9 KB

Images

1.4 MB

CSS

121.5 KB

HTML

24.5 KB

Green Hosting Not Verified

Architectural Systems Inc.

7 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

A+

Security Score

91%Excellent

Static / Informational

HTTPS

No WAF

262d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Cybertrust Japan Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

21.01.2026

Valid Until

31.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.nitroplus.co.jpnitroplus.co.jp

SHA-256 Fingerprint

1A:AD:21:D5:57:93:F8:1F:0E:3C:D5:2D:8F:AB:A7:CA:E5:60:3B:95...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

connection

Keep-Alive

content-type

text/html; charset=UTF-8

date

Wed, 13 May 2026 19:42:05 GMT

expires

Sat, 26 Jul 1997 05:00:00 GMT

keep-alive

timeout=5, max=100

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

alt3.aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

nitroplus.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.

51/100

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=980

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Droid Sans

WCAG Partial

56/100

Readability

/30

18/30

13px · LH 1.50

Hierarchy

/20

10/20

1x ratio

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Droid Sans

Sans13px

Body Font

Droid Sans

Sans13px

Contrast Ratio

1:1

19 issues

Reading Comfort

Single Font Family

center aligned

13px

12px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 46/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 19 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

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

Buy on MyFontsFlesch 46

Color Palette

8 unique colors

5.65:1 AA Light

#f0f1f2

Background· 14.8%

#615e62

Other· 7.3%

#2b3546

Primary· 0%

#d9dee1

Border· 30.500000000000004%

#121b27

Secondary· 10.4%

#413132

Text· 5.2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)googletagmanager.com(2)common(2)google-analytics.com(1)ajax.googleapis.com(1)

Website Identity

nitroplus.co.jp

©NITRO PLUS

Location detected: 🇯🇵 Japanvia tld

📧 Google Workspaceja

Social Profiles

X (Twitter)YouTube Bluesky

Sponsored

Last analyzed: 13 May 2026 at 19:42

Historical Analysis & Change Tracking