paiza.jp

https://paiza.jp· First analyzed 14 May 2026· Updated 14 May 2026

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paiza.jp

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

35.72.239.46

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS16509

Organization

AWS EC2 (ap-northeast-1)

Server

Nginx

Nameservers

ns-974.awsdns-57.net.ns-1290.awsdns-33.org.ns-1587.awsdns-06.co.uk.ns-225.awsdns-28.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.9 s10%

Speed Index

2.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

296 KB

114 requests

Image Optimization

Lazy LoadWebPJetpack Photon (WordPress)

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Technology Stack

13 Technologies Detected

Analytics

Microsoft Clarity Segment

Advertising

Twitter Ads Microsoft Advertising

CSS Frameworks

Tag Managers

Customer Support

Other

Web Servers

SEO Analysis

C63/100

Meta Tags11/15

Content8/12

Headings3/8

Technical16/25

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social4/5

Freshness0/4

Mobile4/4

Indexability3/3

paiza.jppaiza.jp

paiza｜学びをキャリアに。プログラミング学習から就活・転職まで

プログラミング学習からスキルチェックで実力を可視化し、就活・転職まで一貫して支援。ITエンジニア・ITキャリアを目指す方に向けて、スカウトが届き、あなたに合った求人に出会えるキャリア支援サービスです。

Title Length33 chars

Recommended: 50-60 chars (~202px / 580px)

Description Length100 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

6 URLs

robots.txt

7 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

F35/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

0/25

Citation

8/25

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

nav

Text ratio:3%

Words:260

Token eff.:Too Short

Sections/1K:96.2

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1w

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.

78/100

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

4/15

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

2 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.

80/100

A+

30 mg

CO₂e / view

295.7 KB

Page Weight

90%

Cleaner Than

New Visitor

34 mg

Returning (cached)

17 mg

Annual (10K/mo)

3.6 kg

Emission Segments

Data Center

2 mg

Network

9 mg

Device

20 mg

Resource Breakdown

JavaScript

178.8 KB

Images

108.1 KB

HTML

5.3 KB

Other

3.5 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

61%Fair

Interactive

HTTPS

No WAF

246d

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

17.12.2025

Valid Until

15.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.paiza.jppaiza.jp

SHA-256 Fingerprint

E8:16:64:D3:98:83:41:93:A0:96:FF:98:66:3E:6C:E1:18:03:D1:DE...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 0s(max-age=0, private, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Thu, 14 May 2026 17:33:48 GMT

etag

W/"fc2106882da437bbea4977d71492c050"

link

<https://paiza.jp/assets/common/social_button-3609608d2fa7bd...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt2.aspmx.l.google.com

aspmx.l.google.com

aspmx2.googlemail.com

aspmx3.googlemail.com

+1 more

Domain Information

paiza.jp

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.

68/100

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

Hiragino Kaku Gothic ProN

WCAG AAA

70/100

Readability

/30

17/30

16px · LH 2.00

Hierarchy

/20

14/20

1.75x ratio · ✓ H1→H6

WCAG

/25

23/25

11.96:1 min contrast

Performance

/25

16/25

2 fonts

Heading Font

Hiragino Kaku Gothic ProN

Sans28px

Body Font

Hiragino Kaku Gothic ProN

Sans16px

Contrast Ratio

11.96:1

WCAG AAA (≥7:1)

Reading Comfort

~38 CPL

Narrow lines

28px

32px

24px

18px

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.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.0:1).

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

✅ Lean font stack: 2 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 54

Color Palette

11 unique colors

8.77:1 AAA Light

#ffffff

Background· 34.400000000000006%

#4b4b46

Other· 7%

#1e3139

Primary· 7%

#323e3f

Text· 6.5%

#112229

Secondary· 5.5%

#2fbfa4

Accent· 5.2%

#edf4f6

Secondary· 4.8%

#a0bbbc

Secondary· 3.2%

Business & Marketing Stack

9 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Microsoft ClarityFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

connect.facebook.net(5)s.yimg.jp(3)googletagmanager.com(3)clarity.ms(2)google-analytics.com(2)

Website Identity

paiza.jp

Location detected: 🇯🇵 Japanvia tld

📧 Google Workspaceja

Social Profiles

Facebook X (Twitter)

Sponsored

Last analyzed: 14 May 2026 at 17:34

Historical Analysis & Change Tracking