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javadrive.jp

https://javadrive.jp· First analyzed 25 May 2026· Updated 25 May 2026
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javadrive.jp
Desktop screenshot of javadrive.jp
Mobile screenshot of javadrive.jp
Mobile

Sponsored

Hosting Provider

XSERVER Inc.

IP Address

85.131.207.29

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS131965

Organization

XSERVER Inc.

Server

Nginx

Nameservers

ns4.xserver.jp.ns5.xserver.jp.ns3.xserver.jp.ns2.xserver.jp.+1 more

Performance

99

Core Web Vitals

Weight

First Contentful Paint
750 ms10%
Speed Index
975 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
16 KB
21 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
XSERVER Inc.

Technology Stack

4 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

SEO Analysis

C62/100
18
8
0
Meta Tags10/15
Content7/12
Headings6/8
Technical17/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile1/4
Indexability3/3
J
javadrive.jpjavadrive.jp

Let'sプログラミング ～初心者の方を対象としたプログラミングの総合学習サイト～

Let'sプログラミングでは初心者の方を対象にJavaやPython、PHP、Rubyなど色々なプログラミング言語の解説を行っています。

Title Length41 chars

Recommended: 50-60 chars (~252px / 580px)

Description Length68 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    3,977 URLs

    robots.txt

    5 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    7/100
    Poor
    2 14 1

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

    Sponsored

    AI & LLM Readiness

    F34/100
    Bot Access
    20/25
    Machine Read.
    5/25
    Schema Data
    2/25
    Citation
    7/25

    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:13%
    Words:105
    Token eff.:Too Short

    Structured Data

    1 JSON-LD
    WebSite

    Citation Readiness

    Opening Summary
    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...
    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.
    B
    79/100
    12
    Passed
    3
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    14/20
    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
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    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.
    55/100
    A+
    2 mg
    CO₂e / view
    16.4 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    2 mg
    vs
    Returning (cached)
    1 mg
    Annual (10K/mo)
    240 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    <0.001 g
    Device
    1 mg
    Resource Breakdown
    Images
    3.0 KB
    CSS
    1.7 KB
    HTML
    3.5 KB
    Other
    8.3 KB
    Green Hosting Not Verified
    XSERVER Inc.
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    21%Critical
    Interactive

    HTTPS

    No WAF

    65d

    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/2

    Valid From

    30.04.2026

    Valid Until

    29.07.2026

    Subject Alternative Names (2)

    javadrive.jpwww.javadrive.jp

    SHA-256 Fingerprint

    CC:0F:7D:F9:28:44:27:7D:06:AF:F4:9B:FB:8E:05:74:FC:5B:5A:E6...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html
    date
    Mon, 25 May 2026 00:32:06 GMT
    etag
    W/"2752-64dbb0cb16f3f"
    last-modified
    Tue, 24 Mar 2026 01:27:07 GMT
    server
    nginx
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    MX Records (1)

    javadrive.jp

    Domain Information

    javadrive.jp

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    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.
    C
    65/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Helvetica

    WCAG Partial
    60/100
    Readability
    /30
    12/30

    12px · LH 1.75

    Hierarchy
    /20
    17/20

    1.67x ratio · ✓ H1→H6

    WCAG
    /25
    17/25

    3.73:1 min contrast

    Performance
    /25
    14/25

    1 font

    Heading Font

    Helvetica

    Sans20px

    Body Font

    Helvetica

    Sans12px

    Contrast Ratio

    3.73:1

    9 issues

    Reading Comfort

    ~47 CPL

    Optimal (45–75)
    20px
    h1
    12px
    p

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

    ✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

    ❌ Very complex text: Flesch score 6/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 3.7:1).

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

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

    Buy on MyFontsFlesch 6

    Color Palette

    7 unique colors
    Light
    #ffffff
    Background· 78.3%
    #8c99a1
    Primary· 3.2%
    #99b8cd
    Secondary· 2.8%
    #c4d1d7
    Secondary· 2.5%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    9 Resources

    6
    Scripts
    3
    Styles
    5
    Async
    0
    Defer

    Top Script Sources

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

    Website Identity

    Let'sプログラミング

    www.javadrive.jp/
    Location detected: 🇯🇵 Japanvia tld
    ja

    Sponsored

    Last analyzed: 25 May 2026 at 00:32

    Historical Analysis & Change Tracking