ongakunotomo.co.jp

https://ongakunotomo.co.jp· First analyzed 18 May 2026· Updated 18 May 2026

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ongakunotomo.co.jp

Mobile

Sponsored

Hosting Provider

SAKURA Internet Inc.

IP Address

160.16.126.85

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS9370

Organization

SAKURA Internet Inc.

Server

Apache

Nameservers

03.dnsv.jp.04.dnsv.jp.01.dnsv.jp.02.dnsv.jp.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.7 s10%

Speed Index

2.3 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

10.8 MB

132 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

SAKURA Internet Inc.

Technology Stack

10 Technologies Detected

CSS Frameworks

Analytics

Libraries

UI Components

Icon Libraries

Fonts

Tag Managers

Web Servers

SEO Analysis

C63/100

Meta Tags7/15

Content11/12

Headings3/8

Technical13/25

E-E-A-T3/7

Images4/7

Links5/5

URL5/5

Social5/5

Freshness0/4

Mobile4/4

Indexability3/3

ongakunotomo.co.jpongakunotomo.co.jp

音楽之友社：音楽の力を信じ音楽の心を伝えたい

音楽之友社はクラシックを中心とした音楽専門雑誌・書籍・楽譜・CD・高校の音楽教科書を発行する出版社です。Webマガジン「ONTOMO」も運営しております。

Title Length23 chars

Recommended: 50-60 chars (~142px / 580px)

Description Length77 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,000 URLs

robots.txt

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

D44/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

10/25

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:5%

Words:564

Token eff.:Optimal

Sections/1K:21.3

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary12w

Descriptive Headingsavg 1w

Canonical URL

Open Graph2/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

Upgrade to view recommendations

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.

70/100

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

7/15

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

4/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

4 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.

6/100

1.37 g

CO₂e / view

10.8 MB

Page Weight

Cleaner Than

New Visitor

1.56 g

Returning (cached)

782 mg

Annual (10K/mo)

164.2 kg

Emission Segments

Data Center

306 mg

Network

328 mg

Device

734 mg

Resource Breakdown

JavaScript

59.5 KB

Images

10.6 MB

CSS

70.6 KB

Fonts

28.5 KB

HTML

75.9 KB

Green Hosting Not Verified

SAKURA Internet Inc.

9 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

56%Poor

Interactive

HTTPS

No WAF

67d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

25.04.2026

Valid Until

24.07.2026

Subject Alternative Names (1)

www.ongakunotomo.co.jp

SHA-256 Fingerprint

D6:35:BC:D6:56:CB:13:5A:B3:62:1D:F1:62:BF:87:10:6B:6D:42:8C...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

connection

Keep-Alive

content-type

text/html; charset=UTF-8

date

Mon, 18 May 2026 18:21:06 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

keep-alive

timeout=5, max=100

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

snowcivet3.sakura.ne.jp

Domain Information

ongakunotomo.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=device-width,user-scalable=no,maximum-scale=1

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

游ゴシック Medium

WCAG Partial

55/100

Readability

/30

9/30

12px · LH 1.00

Hierarchy

/20

12/20

1.33x ratio · ✓ H1→H6

WCAG

/25

19/25

4:1 min contrast

Performance

/25

15/25

2 fonts · 1 req

Heading Font

游ゴシック Medium

Sans16px

Body Font

游ゴシック Medium

Sans12px

Contrast Ratio

4:1

2 issues

Reading Comfort

~54 CPL

Optimal (45–75)

16px

24px

20px

12px

Minor Third

Scale

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Tight line spacing (1.00). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~54 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 39/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 4.0:1).

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

GGoogle Fonts Buy on MyFontsFlesch 39

Color Palette

9 unique colors

Light

#ffffff

Background· 57.5%

#dc6e3d

Accent· 12.399999999999999%

#a93236

Primary· 8.3%

#c6a697

Secondary· 4.2%

#754341

Secondary· 1.6%

#76171b

Accent· 1.5%

#da5442

Accent· 1.2%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdnjs.cloudflare.com(5)googletagmanager.com(4)google-analytics.com(1)ajax.googleapis.com(1)

Website Identity